In the context of LBR stitching documentation.
Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ali Saidi <alisaidi@amazon.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Link: https://lore.kernel.org/r/20230119201036.156441-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Make the code more readable by checking for SHT_RELA and SHT_REL type
earlier.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20230120123456.12449-11-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
SHT_REL and SHT_RELA are handled the same way. Simplify by combining the
handling.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20230120123456.12449-10-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Create a sensible name for .plt entries with no symbol.
Example:
Before:
$ perf test --dso /usr/lib/x86_64-linux-gnu/libc.so.6 -vv Symbols 2>/tmp/cmp1.txt
After:
$ perf test --dso /usr/lib/x86_64-linux-gnu/libc.so.6 -vv Symbols 2>/tmp/cmp2.txt
$ diff /tmp/cmp1.txt /tmp/cmp2.txt
4c4
< test child forked, pid 53043
---
> test child forked, pid 54372
23,62c23,62
< 280f0-28100 g @plt
< 28100-28110 g @plt
< 28110-28120 g @plt
< 28120-28130 g @plt
< 28130-28140 g @plt
< 28140-28150 g @plt
< 28150-28160 g @plt
< 28160-28170 g @plt
< 28170-28180 g @plt
< 28180-28190 g @plt
< 28190-281a0 g @plt
< 281a0-281b0 g @plt
< 281b0-281c0 g @plt
< 281c0-281d0 g @plt
< 281d0-281e0 g @plt
< 281e0-281f0 g @plt
< 281f0-28200 g @plt
< 28200-28210 g @plt
< 28210-28220 g @plt
< 28220-28230 g @plt
< 28230-28240 g @plt
< 28240-28250 g @plt
< 28250-28260 g @plt
< 28260-28270 g @plt
< 28270-28280 g @plt
< 28280-28290 g @plt
< 28290-282a0 g @plt
< 282a0-282b0 g @plt
< 282b0-282c0 g @plt
< 282c0-282d0 g @plt
< 282d0-282e0 g @plt
< 282e0-282f0 g @plt
< 282f0-28300 g @plt
< 28300-28310 g @plt
< 28310-28320 g @plt
< 28320-28330 g @plt
< 28330-28340 g @plt
< 28340-28350 g @plt
< 28350-28360 g @plt
< 28360-28370 g @plt
---
> 280f0-28100 g offset_0x280f0@plt
> 28100-28110 g offset_0x28100@plt
> 28110-28120 g offset_0x28110@plt
> 28120-28130 g offset_0x28120@plt
> 28130-28140 g offset_0x28130@plt
> 28140-28150 g offset_0x28140@plt
> 28150-28160 g offset_0x28150@plt
> 28160-28170 g offset_0x28160@plt
> 28170-28180 g offset_0x28170@plt
> 28180-28190 g offset_0x28180@plt
> 28190-281a0 g offset_0x28190@plt
> 281a0-281b0 g offset_0x281a0@plt
> 281b0-281c0 g offset_0x281b0@plt
> 281c0-281d0 g offset_0x281c0@plt
> 281d0-281e0 g offset_0x281d0@plt
> 281e0-281f0 g offset_0x281e0@plt
> 281f0-28200 g offset_0x281f0@plt
> 28200-28210 g offset_0x28200@plt
> 28210-28220 g offset_0x28210@plt
> 28220-28230 g offset_0x28220@plt
> 28230-28240 g offset_0x28230@plt
> 28240-28250 g offset_0x28240@plt
> 28250-28260 g offset_0x28250@plt
> 28260-28270 g offset_0x28260@plt
> 28270-28280 g offset_0x28270@plt
> 28280-28290 g offset_0x28280@plt
> 28290-282a0 g offset_0x28290@plt
> 282a0-282b0 g offset_0x282a0@plt
> 282b0-282c0 g offset_0x282b0@plt
> 282c0-282d0 g offset_0x282c0@plt
> 282d0-282e0 g offset_0x282d0@plt
> 282e0-282f0 g offset_0x282e0@plt
> 282f0-28300 g offset_0x282f0@plt
> 28300-28310 g offset_0x28300@plt
> 28310-28320 g offset_0x28310@plt
> 28320-28330 g offset_0x28320@plt
> 28330-28340 g offset_0x28330@plt
> 28340-28350 g offset_0x28340@plt
> 28350-28360 g offset_0x28350@plt
> 28360-28370 g offset_0x28360@plt
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20230120123456.12449-9-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
perf expands the _init symbol over .plt because there are no PLT symbols
at that point, but then dso__synthesize_plt_symbols() creates them.
Fix by truncating the previous symbol and inserting a symbol for .plt
header.
Example:
Before:
$ perf test --dso `which uname` -v Symbols
74: Symbols :
--- start ---
test child forked, pid 191028
Problems creating module maps, continuing anyway...
Testing /usr/bin/uname
Overlapping symbols:
2000-25f0 g _init
2040-2050 g free@plt
test child finished with -1
---- end ----
Symbols: FAILED!
$ perf test --dso `which uname` -vv Symbols 2>/tmp/cmp1.txt
After:
$ perf test --dso `which uname` -v Symbols
74: Symbols :
--- start ---
test child forked, pid 194291
Testing /usr/bin/uname
test child finished with 0
---- end ----
Symbols: Ok
$ perf test --dso `which uname` -vv Symbols 2>/tmp/cmp2.txt
$ diff /tmp/cmp1.txt /tmp/cmp2.txt
4,5c4
< test child forked, pid 191031
< Problems creating module maps, continuing anyway...
---
> test child forked, pid 194296
9c8,9
< 2000-25f0 g _init
---
> 2000-2030 g _init
> 2030-2040 g .plt
100,103c100
< Overlapping symbols:
< 2000-25f0 g _init
< 2040-2050 g free@plt
< test child finished with -1
---
> test child finished with 0
105c102
< Symbols: FAILED!
---
> Symbols: Ok
$
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20230120123456.12449-8-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
ss->dynsym is checked to be not NULL twice. Remove the first check
because, in fact, there can be a plt with no dynsym, which is something
that will be dealt with later.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20230120123456.12449-7-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Return zero directly instead of needless 'goto out_elf_end' that does
the same thing. That allows 'err' to be initialized to -1 instead of
having to change its value later.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20230120123456.12449-6-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Symbols should not be cached when there are more symbols still to add.
Add dso__find_symbol_nocache() to facilitate that.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20230120123456.12449-5-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
The code expects non-zero plt_entry_size. Check it and add a debug
message to print if it is zero.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20230120123456.12449-4-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Factor out get_plt_sizes() to make the code more readable and further
changes to dso__synthesize_plt_symbols() easier to follow.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20230120123456.12449-3-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Add a test to check function symbols do not overlap and are not zero
length.
The main motivation for the test is to make it easier to review changes
to PLT symbol synthesis i.e. changes to dso__synthesize_plt_symbols().
By default the test uses the perf executable as a test DSO, but a
specific DSO can be specified via a new perf test option "--dso".
The test is useful in the following ways:
- Any DSO can be tested, even ones that do not run on the current
architecture. For example, using cross-compiled DSOs to see how
well perf handles different architectures.
- With verbose > 1 (e.g. -vv), all the symbols are printed, which
makes it easier to see issues.
- perf removes duplicate symbols and expands zero-length symbols
to reach the next symbol, however that is done before adding
synthesized symbols, so the test is checking those also.
Example:
$ perf test -v Symbols
74: Symbols :
--- start ---
test child forked, pid 154918
Testing /home/user/bin/perf
Overlapping symbols:
7d000-7f3a0 g _init
7d030-7d040 g __printf_chk@plt
test child finished with -1
---- end ----
Symbols: FAILED!
Note the test fails because perf expands the _init symbol over the PLT
because there are no PLT symbols at that point, but then
dso__synthesize_plt_symbols() creates them.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20230120123456.12449-2-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
The count variable is incremented by multiple threads, doing so
without an atomic operation causes thread sanitizer warnings. Switch
to using relaxed atomics.
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230114215251.271678-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
libtraceevent has added more levels of debug printout and with changes
like:
https://lore.kernel.org/linux-trace-devel/20210507095022.1079364-3-tz.stoyanov@gmail.com
previously generated output like "registering plugin" is no longer
displayed. This change makes it so that if perf's verbose debug output
is enabled then the debug and info libtraceevent messages can be
displayed.
This change was previously posted:
https://lore.kernel.org/linux-perf-users/20210923001024.550263-4-irogers@google.com/
and reverted:
https://lore.kernel.org/linux-perf-users/20220109153446.160593-1-acme@kernel.org/
The previous failure was due to -Itools/lib being on the include path
and libtraceevent in tools/lib being version 1.1.0. This meant that when
LIBTRACEEVENT_VERSION was 1.3.0 the #if succeeded, but the header file
for libtraceevent (taken from tools/lib rather than the intended
/usr/include) was for version 1.1.0 and function definitions were
missing.
Since the previous issue the -Itools/lib include path has been
removed:
https://lore.kernel.org/lkml/20221109184914.1357295-1-irogers@google.com/
As well as libtraceevent 1.1.0 has been removed from tools/lib:
https://lore.kernel.org/lkml/20221130062935.2219247-1-irogers@google.com/
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Eelco Chaudron <echaudro@redhat.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Kim Phillips <kim.phillips@amd.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Link: https://lore.kernel.org/r/20230111070641.1728726-3-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Add a helper function that applies the mask to test, or returns false
if libtraceevent is too old or not present.
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Eelco Chaudron <echaudro@redhat.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Kim Phillips <kim.phillips@amd.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Link: https://lore.kernel.org/r/20230111070641.1728726-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Switch HAVE_LIBTRACEEVENT_TEP_FIELD_IS_RELATIVE to be a version number
test on libtraceevent being >= to version 1.5.0. This also corrects a
greater-than test to be greater-than-or-equal.
Fixes: b9a49f8cb0 ("perf tools: Check if libtracevent has TEP_FIELD_IS_RELATIVE")
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Eelco Chaudron <echaudro@redhat.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Kim Phillips <kim.phillips@amd.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Link: https://lore.kernel.org/lkml/20221205225940.3079667-3-irogers@google.com/
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
The LLVM template is first echo-ed into command_out and then
command_out executed. The echo surrounds the template with double
quotes, however, the template itself may contain quotes. This is
generally innocuous but in tools/perf/tests/bpf-script-test-prologue.c
we see:
...
SEC("func=null_lseek file->f_mode offset orig")
...
where the first double quote ends the double quote of the echo, then
the > redirects output into a file called f_mode.
To avoid this inadvertent behavior substitute redirects and similar
characters to be ASCII control codes, then substitute the output in
the echo back again.
Fixes: 5eab5a7ee0 ("perf llvm: Display eBPF compiling command in debug output")
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: bpf@vger.kernel.org
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: llvm@lists.linux.dev
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20230105082609.344538-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
The event list of the Emerald Rapids is the same as the Sapphire
Rapids. Add the CPU model ID of Emerald Rapids into the mapfile.csv and
point it to the event list of Sapphire Rapids.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20230118175632.3165217-1-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Add instruction mix related metrics.
Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrew Kilroy <andrew.kilroy@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shuai Xue <xueshuai@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: Zhuo Song <zhuo.song@linux.alibaba.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/1673940573-90503-10-git-send-email-renyu.zj@linux.alibaba.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Add PE utilization related metrics. In cpu_utilization metric, if it is
neoverse-n2 which slots are 5, the real stall_slot need to subtract the
cpu_cycles according to the neoverse-n2 errata [0].
[0] https://documentation-service.arm.com/static/636a66a64e6cf12278ad89cb?token=
Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrew Kilroy <andrew.kilroy@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shuai Xue <xueshuai@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: Zhuo Song <zhuo.song@linux.alibaba.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/1673940573-90503-9-git-send-email-renyu.zj@linux.alibaba.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Add branch related metrics.
Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrew Kilroy <andrew.kilroy@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shuai Xue <xueshuai@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: Zhuo Song <zhuo.song@linux.alibaba.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/1673940573-90503-8-git-send-email-renyu.zj@linux.alibaba.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Add cache related metrics.
Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrew Kilroy <andrew.kilroy@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shuai Xue <xueshuai@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: Zhuo Song <zhuo.song@linux.alibaba.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/1673940573-90503-7-git-send-email-renyu.zj@linux.alibaba.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Add TLB related metrics.
Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrew Kilroy <andrew.kilroy@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shuai Xue <xueshuai@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: Zhuo Song <zhuo.song@linux.alibaba.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/1673940573-90503-6-git-send-email-renyu.zj@linux.alibaba.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Add general topdown L1 metrics for neoverse-n2-v2. Due to the wrong
count of stall_slot and stall_slot_frontend on neoverse-n2, the real
stall_slot and real stall_slot_frontend need to subtract cpu_cycles,
so overwrite the "MetricExpr" for neoverse-n2 which slots are 5.
Reference from ARM neoverse-n2 errata notice [0], D117.
Since neoverse-n2/neoverse-v2 does not yet support topdown L2, metric
groups such as Cache, TLB, Branch, InstructionsMix and PEutilization
will be added to further analysis of performance bottlenecks in the
following patches. Reference from ARM PMU guide [1][2].
[0] https://documentation-service.arm.com/static/636a66a64e6cf12278ad89cb?token=
[1] https://documentation-service.arm.com/static/628f8fa3dfaf015c2b76eae8?token=
[2] https://documentation-service.arm.com/static/62cfe21e31ea212bb6627393?token=
Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrew Kilroy <andrew.kilroy@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shuai Xue <xueshuai@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: Zhuo Song <zhuo.song@linux.alibaba.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/1673940573-90503-5-git-send-email-renyu.zj@linux.alibaba.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
The metrics of topdown L1 are from ARM sbsa7.0 platform design doc[0],
D37-38, which are standard. So put them in the common file sbsa.json of
arm64, so that other cores besides n2/v2 can also be reused.
[0] https://documentation-service.arm.com/static/60250c7395978b529036da86?token=
Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrew Kilroy <andrew.kilroy@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shuai Xue <xueshuai@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: Zhuo Song <zhuo.song@linux.alibaba.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/1673940573-90503-4-git-send-email-renyu.zj@linux.alibaba.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Add general metrics support, so that some general metrics applicable to
multiple architectures can be defined in the public JSON file like
general events, and then add general metrics through "arch_std_event" in
JSON file of different architecture.
Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrew Kilroy <andrew.kilroy@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shuai Xue <xueshuai@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: Zhuo Song <zhuo.song@linux.alibaba.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/1673940573-90503-3-git-send-email-renyu.zj@linux.alibaba.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
The slots in each architecture may be different, so add #slots literal
to obtain the slots of different architectures, and the #slots can be
applied in the metric. Currently, The #slots just support for arm64,
and other architectures will return NAN.
On arm64, the value of slots is from the register PMMIR_EL1.SLOT, which
I can read in /sys/bus/event_source/device/armv8_pmuv3_*/caps/slots.
PMMIR_EL1.SLOT might read as zero if the PMU version is lower than
ID_AA64DFR0_EL1_PMUVer_V3P4 or the STALL_SLOT event is not implemented.
Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrew Kilroy <andrew.kilroy@arm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shuai Xue <xueshuai@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: Zhuo Song <zhuo.song@linux.alibaba.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/1673940573-90503-2-git-send-email-renyu.zj@linux.alibaba.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Currently flame graph generation requires a d3-flame-graph template to
be installed. Unfortunately this is hard to come by for things like
Debian [1].
If the template isn't installed then ask if it should be downloaded from
jsdelivr CDN. The downloaded HTML file is validated against an md5sum.
If the download fails, generate a minimal flame graph with the
javascript coming from links to jsdelivr CDN.
v3. Adds a warning message and quits before download in live mode.
v2. Change the warning to a prompt about downloading and add the
--allow-download command line flag. Add an md5sum check for the
downloaded HTML.
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=996839
Reviewed-by: Andreas Gerstmayr <agerstmayr@redhat.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: 996839@bugs.debian.org
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Brendan Gregg <brendan@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Martin Spier <spiermar@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230118072409.147786-1-irogers@google.com # v3 discussion
Link: https://lore.kernel.org/r/20230112220024.32709-1-irogers@google.com # v2 discussion
Link: https://lore.kernel.org/r/CAP-5=fXi_9zdhTAoYApiFQoLURAvpEatFzU3uL23o3zs=z25ZQ@mail.gmail.com # v1 discussion
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Merge tag 'for-linus-2023011801' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid
Pull HID fixes from Jiri Kosina:
- fixes for potential empty list handling in HID core (Pietro Borrello)
- fix for NULL pointer dereference in betop driver that could be
triggered by malicious device (Pietro Borrello)
- fixes for handling calibration data preventing division by zero in
Playstation driver (Roderick Colenbrander)
- fix for memory leak on error path in amd-sfh driver (Basavaraj
Natikar)
- other few assorted small fixes and device ID-specific handling
* tag 'for-linus-2023011801' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid:
HID: betop: check shape of output reports
HID: playstation: sanity check DualSense calibration data.
HID: playstation: sanity check DualShock4 calibration data.
HID: uclogic: Add support for XP-PEN Deco 01 V2
HID: revert CHERRY_MOUSE_000C quirk
HID: check empty report_list in bigben_probe()
HID: check empty report_list in hid_validate_values()
HID: amd_sfh: Fix warning unwind goto
HID: intel_ish-hid: Add check for ishtp_dma_tx_map
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Merge tag 'affs-for-6.2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull affs fix from David Sterba:
"One minor fix for a KCSAN report"
* tag 'affs-for-6.2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
affs: initialize fsdata in affs_truncate()
- Fix wrong iomap->length calculation post EOF, which could
cause a WARN_ON in iomap_iter_done() (Siddh);
- Fix improper kvcalloc() use with __GFP_NOFAIL (me);
- Add missing `domain_id` mount option in documentation (Jingbo);
- Clean up fscache option parsing (Jingbo).
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Merge tag 'erofs-for-6.2-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs
Pull erofs fixes from Gao Xiang:
"Two patches fixes issues reported by syzbot, one fixes a missing
`domain_id` mount option in documentation and a minor cleanup:
- Fix wrong iomap->length calculation post EOF, which could cause a
WARN_ON in iomap_iter_done() (Siddh)
- Fix improper kvcalloc() use with __GFP_NOFAIL (me)
- Add missing `domain_id` mount option in documentation (Jingbo)
- Clean up fscache option parsing (Jingbo)"
* tag 'erofs-for-6.2-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
erofs: clean up parsing of fscache related options
erofs: add documentation for 'domain_id' mount option
erofs: fix kvcalloc() misuse with __GFP_NOFAIL
erofs/zmap.c: Fix incorrect offset calculation
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Merge tag 'loongarch-fixes-6.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
Pull LoongArch fixes from Huacai Chen:
"Fix a missing elf_hwcap, fix some stack unwinder bugs and two trivial
cleanups"
* tag 'loongarch-fixes-6.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson:
LoongArch: Add generic ex-handler unwind in prologue unwinder
LoongArch: Strip guess unwinder out from prologue unwinder
LoongArch: Use correct sp value to get graph addr in stack unwinders
LoongArch: Get frame info in unwind_start() when regs is not available
LoongArch: Adjust PC value when unwind next frame in unwinder
LoongArch: Simplify larch_insn_gen_xxx implementation
LoongArch: Use common function sign_extend64()
LoongArch: Add HWCAP_LOONGARCH_CPUCFG to elf_hwcap
betopff_init() only checks the total sum of the report counts for each
report field to be at least 4, but hid_betopff_play() expects 4 report
fields.
A device advertising an output report with one field and 4 report counts
would pass the check but crash the kernel with a NULL pointer dereference
in hid_betopff_play().
Fixes: 52cd7785f3 ("HID: betop: add drivers/hid/hid-betopff.c")
Signed-off-by: Pietro Borrello <borrello@diag.uniroma1.it>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Make sure calibration values are defined to prevent potential kernel
crashes. This fixes a hypothetical issue for virtual or clone devices
inspired by a similar fix for DS4.
Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Some DualShock4 devices report invalid calibration data resulting
in kernel oopses due to division by zero during report handling.
The devices affected generally appear to be clone devices, which don't
implement all reports properly and don't populate proper calibration
data. The issue may have been seen on an official device with erased
calibration reports.
This patch prevents the crashes by essentially disabling calibration
when invalid values are detected.
Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
Tested-by: Alain Carlucci <alain.carlucci@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
The XP-PEN Deco 01 V2 is a UGEE v2 device with a frame with 8 buttons.
Its pen has 2 buttons, supports tilt and pressure.
Add its ID in order to support the device.
Link: https://gitlab.freedesktop.org/libinput/libinput/-/issues/839
Tested-by: Mark Waddoups <mwaddoups@gmail.com>
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This partially reverts commit f6d910a89a ("HID: usbhid: Add ALWAYS_POLL quirk
for some mice"), as it turns out to break reboot on some platforms for reason
yet to be understood.
Fixes: f6d910a89a ("HID: usbhid: Add ALWAYS_POLL quirk for some mice")
Reported-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Add a check for empty report_list in bigben_probe().
The missing check causes a type confusion when issuing a list_entry()
on an empty report_list.
The problem is caused by the assumption that the device must
have valid report_list. While this will be true for all normal HID
devices, a suitably malicious device can violate the assumption.
Fixes: 256a90ed9e ("HID: hid-bigbenff: driver for BigBen Interactive PS3OFMINIPAD gamepad")
Signed-off-by: Pietro Borrello <borrello@diag.uniroma1.it>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Add a check for empty report_list in hid_validate_values().
The missing check causes a type confusion when issuing a list_entry()
on an empty report_list.
The problem is caused by the assumption that the device must
have valid report_list. While this will be true for all normal HID
devices, a suitably malicious device can violate the assumption.
Fixes: 1b15d2e5b8 ("HID: core: fix validation of report id 0")
Signed-off-by: Pietro Borrello <borrello@diag.uniroma1.it>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
When exception is triggered, code flow go handle_\exception in some
cases. One of stackframe in this case as follows,
high -> +-------+
| REGS | <- a pt_regs
| |
| | <- ex trigger
| REGS | <- ex pt_regs <-+
| | |
| | |
low -> +-------+ ->unwind-+
When unwinder unwinds to handler_\exception it cannot go on prologue
analysis. Because it is an asynchronous code flow, we should get the
next frame PC from regs->csr_era rather than regs->regs[1]. At init time
we copy the handlers to eentry and also copy them to NUMA-affine memory
named pcpu_handlers if NUMA is enabled. Thus, unwinder cannot unwind
normally. To solve this, we try to give some hints in handler_\exception
and fixup unwinders in unwind_next_frame().
Reported-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
The prolugue unwinder rely on symbol info. When PC is not in kernel text
address, it cannot find relative symbol info and it will be broken. The
guess unwinder will be used in this case. And the guess unwinder code in
prolugue unwinder is redundant. Strip it out and set the unwinder type
in unwind_state. Make guess_unwinder::unwind_next_frame() as default way
when other unwinders cannot unwind in some extreme case.
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
The stack frame when function_graph enable like follows,
--------- <- function sp_on_entry
|
|
|
FAKE_RA <- sp_on_entry - sizeof(pt_regs) + PT_R1
|
--------- <- sp_on_entry - sizeof(pt_regs)
So if we want to get the &FAKE_RA we should get sp_on_entry first. In
the unwinder_prologue case, we can get the sp_on_entry as state->sp,
because we try to calculate each CFA and the ra saved address. But in
the unwinder_guess case, we cannot get it because we do not try to
calculate the CFA. Although LoongArch have not fixed frame, the $ra is
saved at CFA - 8 in most cases, we can try guess, too. As we store the
pc in state, we not need to dereference state->sp, too.
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
At unwind_start(), it is better to get its frame info here rather than
get them outside, even we don't have 'regs'. In this way we can simply
use unwind_{start, next_frame, done} outside.
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
When state->first is not set, the PC is a return address in the previous
frame. We need to adjust its value in case overflow to the next symbol.
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
There exists a common function sign_extend64() to sign extend a 64-bit
value using specified bit as sign-bit in include/linux/bitops.h, it is
more efficient, let us use it and remove the arch-specific sign_extend()
under arch/loongarch.
Suggested-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
HWCAP_LOONGARCH_CPUCFG is missing in elf_hwcap, so add it for glibc's
later use.
Cc: stable@vger.kernel.org
Reported-by: Yinyu Cai <caiyinyu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
the cc:stable tag.
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Merge tag 'mm-hotfixes-stable-2023-01-16-15-23' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull misc hotfixes from Andrew Morton:
"21 hotfixes. Thirteen of these address pre-6.1 issues and hence have
the cc:stable tag"
* tag 'mm-hotfixes-stable-2023-01-16-15-23' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (21 commits)
init/Kconfig: fix typo (usafe -> unsafe)
nommu: fix split_vma() map_count error
nommu: fix do_munmap() error path
nommu: fix memory leak in do_mmap() error path
MAINTAINERS: update Robert Foss' email address
proc: fix PIE proc-empty-vm, proc-pid-vm tests
mm: update mmap_sem comments to refer to mmap_lock
include/linux/mm: fix release_pages_arg kernel doc comment
lib/win_minmax: use /* notation for regular comments
kasan: mark kasan_kunit_executing as static
nilfs2: fix general protection fault in nilfs_btree_insert()
Docs/admin-guide/mm/zswap: remove zsmalloc's lack of writeback warning
mm/hugetlb: pre-allocate pgtable pages for uffd wr-protects
hugetlb: unshare some PMDs when splitting VMAs
mm: fix vma->anon_name memory leak for anonymous shmem VMAs
mm/shmem: restore SHMEM_HUGE_DENY precedence over MADV_COLLAPSE
mm/MADV_COLLAPSE: don't expand collapse when vm_end is past requested end
mm/userfaultfd: enable writenotify while userfaultfd-wp is enabled for a VMA
mm/khugepaged: fix collapse_pte_mapped_thp() to allow anon_vma
mm/hugetlb: fix uffd-wp handling for migration entries in hugetlb_change_protection()
...
