Add byte-swapping versions of __raw_writeq() and __raw_rm_writeq().
This allows us to avoid sparse warnings caused by passing __be64 to
__raw_writeq(), which takes unsigned long:
arch/powerpc/platforms/powernv/pci-ioda.c:1981:38:
warning: incorrect type in argument 1 (different base types)
expected unsigned long [unsigned] v
got restricted __be64 [usertype] <noident>
It's also generally preferable to use a byte-swapping accessor rather
than doing it by hand in the code, which is more bug prone.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
Currently memory is allocated for core-imc based on cpu_present_mask,
which has bit 'cpu' set iff cpu is populated. We use (cpu number / threads
per core) as the array index to access the memory.
Under some circumstances firmware marks a CPU as GUARDed CPU and boot the
system, until cleared of errors, these CPU's are unavailable for all
subsequent boots. GUARDed CPUs are possible but not present from linux
view, so it blows a hole when we assume the max length of our allocation
is driven by our max present cpus, where as one of the cpus might be online
and be beyond the max present cpus, due to the hole.
So (cpu number / threads per core) value bounds the array index and leads
to memory overflow.
Call trace observed during a guard test:
Faulting instruction address: 0xc000000000149f1c
cpu 0x69: Vector: 380 (Data Access Out of Range) at [c000003fea303420]
pc:c000000000149f1c: prefetch_freepointer+0x14/0x30
lr:c00000000014e0f8: __kmalloc+0x1a8/0x1ac
sp:c000003fea3036a0
msr:9000000000009033
dar:c9c54b2c91dbf6b7
current = 0xc000003fea2c0000
paca = 0xc00000000fddd880 softe: 3 irq_happened: 0x01
pid = 1, comm = swapper/104
Linux version 4.16.7-openpower1 (smc@smc-desktop) (gcc version 6.4.0
(Buildroot 2018.02.1-00006-ga8d1126)) #2 SMP Fri May 4 16:44:54 PDT 2018
enter ? for help
call trace:
__kmalloc+0x1a8/0x1ac
(unreliable)
init_imc_pmu+0x7f4/0xbf0
opal_imc_counters_probe+0x3fc/0x43c
platform_drv_probe+0x48/0x80
driver_probe_device+0x22c/0x308
__driver_attach+0xa0/0xd8
bus_for_each_dev+0x88/0xb4
driver_attach+0x2c/0x40
bus_add_driver+0x1e8/0x228
driver_register+0xd0/0x114
__platform_driver_register+0x50/0x64
opal_imc_driver_init+0x24/0x38
do_one_initcall+0x150/0x15c
kernel_init_freeable+0x250/0x254
kernel_init+0x1c/0x150
ret_from_kernel_thread+0x5c/0xc8
Allocating memory for core-imc based on cpu_possible_mask, which has
bit 'cpu' set iff cpu is populatable, will fix this issue.
Reported-by: Pridhiviraj Paidipeddi <ppaidipe@linux.vnet.ibm.com>
Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Reviewed-by: Balbir Singh <bsingharora@gmail.com>
Tested-by: Pridhiviraj Paidipeddi <ppaidipe@linux.vnet.ibm.com>
Fixes: 39a846db1d ("powerpc/perf: Add core IMC PMU support")
Cc: stable@vger.kernel.org # v4.14+
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Trivial fix to spelling mistake in battery_charging array.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
My powerpc-linux-gnu-gcc v4.4.5 compiler can't build a 32-bit kernel
any more:
arch/powerpc/lib/sstep.c: In function 'do_popcnt':
arch/powerpc/lib/sstep.c:1068: error: integer constant is too large for 'long' type
arch/powerpc/lib/sstep.c:1069: error: integer constant is too large for 'long' type
arch/powerpc/lib/sstep.c:1069: error: integer constant is too large for 'long' type
arch/powerpc/lib/sstep.c:1070: error: integer constant is too large for 'long' type
arch/powerpc/lib/sstep.c:1079: error: integer constant is too large for 'long' type
arch/powerpc/lib/sstep.c: In function 'do_prty':
arch/powerpc/lib/sstep.c:1117: error: integer constant is too large for 'long' type
This file gets compiled with -std=gnu89 which means a constant can be
given the type 'long' even if it won't fit. Fix the errors with a 'ULL'
suffix on the relevant constants.
Fixes: 2c979c489f ("powerpc/lib/sstep: Add prty instruction emulation")
Fixes: dcbd19b48d ("powerpc/lib/sstep: Add popcnt instruction emulation")
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
A kernel crash in process context that calls emergency_restart from
panic will end up calling opal_event_shutdown with interrupts disabled
but not in interrupt. This causes a sleeping function to be called
which gives the following warning with sysrq+c:
Rebooting in 10 seconds..
BUG: sleeping function called from invalid context at kernel/locking/mutex.c:238
in_atomic(): 0, irqs_disabled(): 1, pid: 7669, name: bash
CPU: 20 PID: 7669 Comm: bash Tainted: G D W 4.17.0-rc5+ #3
Call Trace:
dump_stack+0xb0/0xf4 (unreliable)
___might_sleep+0x174/0x1a0
mutex_lock+0x38/0xb0
__free_irq+0x68/0x460
free_irq+0x70/0xc0
opal_event_shutdown+0xb4/0xf0
opal_shutdown+0x24/0xa0
pnv_shutdown+0x28/0x40
machine_shutdown+0x44/0x60
machine_restart+0x28/0x80
emergency_restart+0x30/0x50
panic+0x2a0/0x328
oops_end+0x1ec/0x1f0
bad_page_fault+0xe8/0x154
handle_page_fault+0x34/0x38
--- interrupt: 300 at sysrq_handle_crash+0x44/0x60
LR = __handle_sysrq+0xfc/0x260
flag_spec.62335+0x12b844/0x1e8db4 (unreliable)
__handle_sysrq+0xfc/0x260
write_sysrq_trigger+0xa8/0xb0
proc_reg_write+0xac/0x110
__vfs_write+0x6c/0x240
vfs_write+0xd0/0x240
ksys_write+0x6c/0x110
Fixes: 9f0fd0499d ("powerpc/powernv: Add a virtual irqchip for opal events")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
arch/powerpc/Makefile activates -mmultiple on BE PPC32 configs
in order to use multiple word instructions in functions entry/exit.
The patch does the same for the asm parts, for consistency.
On processors like the 8xx on which insn fetching is pretty slow,
this speeds up registers save/restore.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: PPC32 is BE only, so drop the endian checks]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Doing the test at exit of the function avoids an unnecessary
test and branch inside longjmp().
Semantics are unchanged.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This reverts commit 6ad966d730.
That commit was pointless, because csum_add() sums two 32 bits
values, so the sum is 0x1fffffffe at the maximum.
And then when adding upper part (1) and lower part (0xfffffffe),
the result is 0xffffffff which doesn't carry.
Any lower value will not carry either.
And behind the fact that this commit is useless, it also kills the
whole purpose of having an arch specific inline csum_add()
because the resulting code gets even worse than what is obtained
with the generic implementation of csum_add()
0000000000000240 <.csum_add>:
240: 38 00 ff ff li r0,-1
244: 7c 84 1a 14 add r4,r4,r3
248: 78 00 00 20 clrldi r0,r0,32
24c: 78 89 00 22 rldicl r9,r4,32,32
250: 7c 80 00 38 and r0,r4,r0
254: 7c 09 02 14 add r0,r9,r0
258: 78 09 00 22 rldicl r9,r0,32,32
25c: 7c 00 4a 14 add r0,r0,r9
260: 78 03 00 20 clrldi r3,r0,32
264: 4e 80 00 20 blr
In comparison, the generic implementation of csum_add() gives:
0000000000000290 <.csum_add>:
290: 7c 63 22 14 add r3,r3,r4
294: 7f 83 20 40 cmplw cr7,r3,r4
298: 7c 10 10 26 mfocrf r0,1
29c: 54 00 ef fe rlwinm r0,r0,29,31,31
2a0: 7c 60 1a 14 add r3,r0,r3
2a4: 78 63 00 20 clrldi r3,r3,32
2a8: 4e 80 00 20 blr
And the reverted implementation for PPC64 gives:
0000000000000240 <.csum_add>:
240: 7c 84 1a 14 add r4,r4,r3
244: 78 80 00 22 rldicl r0,r4,32,32
248: 7c 80 22 14 add r4,r0,r4
24c: 78 83 00 20 clrldi r3,r4,32
250: 4e 80 00 20 blr
Fixes: 6ad966d730 ("powerpc/64: Fix checksum folding in csum_add()")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
PMD_PAGE_SIZE() is nowhere used and _PMD_SIZE is only
used by PMD_PAGE_SIZE().
This patch removes them.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
The interrupt controller inside the Wii's Hollywood chip is connected to
two masters, the "Broadway" PowerPC and the "Starlet" ARM926, each with
their own interrupt status and mask registers.
When booting the Wii with mini[1], interrupts from the SD card
controller (IRQ 7) are handled by the ARM, because mini provides SD
access over IPC. Linux however can't currently use or disable this IPC
service, so both sides try to handle IRQ 7 without coordination.
Let's instead make sure that all interrupts that are unmasked on the PPC
side are masked on the ARM side; this will also make sure that Linux can
properly talk to the SD card controller (and potentially other devices).
If access to a device through IPC is desired in the future, interrupts
from that device should not be handled by Linux directly.
[1]: https://github.com/lewurm/mini
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
On the Wii, there is a secondary IRQ controller (hlwd-pic), so
flipper-pic's match operation should not be hardcoded to return 1.
In fact, the default matching logic is sufficient, and we can completely
omit flipper_pic_match.
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Instead of encoding shift in the table address, use an enumerated index value.
This allow us to do different things in the callback for pte and pmd.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
4K config use one full page at level 4 of the pagetable. Add support for single
fragment allocation in pagetable fragment code and and use that for 4K config.
This makes both 4k and 64k use the same code path. Later we will switch pmd to
use the page table fragment code. This is done only for 64bit platforms which
is using page table fragment support.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Now that we have removed 64K page size support, the RCU page table free can
be much simpler for nohash. Make a copy of the the rcu callback to pgalloc.h
header similar to nohash 32. We could possibly merge 32 and 64 bit there. But
that is for a later patch
We also move the book3s specific handler to pgtable_book3s64.c. This will be
updated in a later patch to handle split pmd ptlock.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
We have in Kconfig
config PPC_64K_PAGES
bool "64k page size"
depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
Only supported BOOK3E 64 bit platforms is FSL_BOOK3E. Remove the dead 64k page
support code from 64bit nohash.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
We rename the alloc and get_from_cache to indicate they operate on pte
fragments. In later patch we will add pmd fragment support.
No functional change in this patch.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
In later patch we switch pmd_lock from mm->page_table_lock to split pmd ptlock.
It avoid compilations issues, use pmd_lockptr helper.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Only code movement and avoid #ifdef.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
In the next set of patches, we will switch pmd allocator to use page fragments
and the locking will be updated to split pmd ptlock. We want to avoid using
fragments for partition-scoped table. Use slab cache similar to level 4 table
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Use new return type vm_fault_t for fault handler. For now, this is
just documenting that the function returns a VM_FAULT value rather
than an errno. Once all instances are converted, vm_fault_t will
become a distinct type. See commit 1c8f422059 ("mm: change return
type to vm_fault_t").
We are fixing a minor bug, that the error from vm_insert_pfn() was
being ignored and the effect of this is likely to be only felt in OOM
situations.
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Trivial fix to spelling mistake in debug messages of a structure
field name
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
The exec_target binary could segfault calling _exit(2) because r13
is not set up properly (and libc looks at that when performing a
syscall). Call SYS_exit using syscall(2) which doesn't seem to
have this problem.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
At the moment we assume that IODA2 and newer PHBs can always do 4K/64K/16M
IOMMU pages, however this is not the case for POWER9 and now skiboot
advertises the supported sizes via the device so we use that instead
of hard coding the mask.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Currently memtrace doesn't build if NUMA=n:
In function ‘memtrace_alloc_node’:
arch/powerpc/platforms/powernv/memtrace.c:134:6:
error: the address of ‘contig_page_data’ will always evaluate as ‘true’
if (!NODE_DATA(nid) || !node_spanned_pages(nid))
^
This is because for NUMA=n NODE_DATA(nid) points to an always
allocated structure, contig_page_data.
But even in the NUMA=y case memtrace_alloc_node() is only called for
online nodes, and we should always have a NODE_DATA() allocated for an
online node. So remove the (hopefully) overly paranoid check, which
also means we can build when NUMA=n.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
In commit e6a6928c3e ("of/fdt: Convert FDT functions to use
libfdt") (Apr 2014), the generic flat device tree code dropped support
for flat device tree's older than version 0x10 (16).
We still have code in our CPU scanning to cope with flat device tree
versions earlier than 2, which can now never trigger, so drop it.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Add a test of the relative branch patching logic in the alternate
section feature fixup code. This tests that if we branch past the last
instruction of the alternate section, the branch is not patched.
That's because the assembler will have created a branch that already
points to the first instruction after the patched section, which is
correct and needs no further patching.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
We want this to remain the last test (because it's disabled by
default), so give it a non-numbered name so we don't have to renumber
it when adding new tests before it.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
The code patching code has always been a bit confused about whether
it's best to use void *, unsigned int *, char *, etc. to point to
instructions. In fact in the feature fixups tests we use both unsigned
int[] and u8[] in different places.
Unfortunately the tests that use unsigned int[] calculate the size of
the code blocks using subtraction of those unsigned int pointers, and
then pass the result to memcmp(). This means we're only comparing 1/4
of the bytes we need to, because we need to multiply by
sizeof(unsigned int) to get the number of *bytes*.
The result is that the tests do all the patching and then only compare
some of the resulting code, so patching bugs that only effect that
last 3/4 of the code could slip through undetected. It turns out that
hasn't been happening, although one test had a bad expected case (see
previous commit).
Fix it for now by multiplying the size by 4 in the affected functions.
Fixes: 362e7701fd ("powerpc: Add self-tests of the feature fixup code")
Epic-brown-paper-bag-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
The expected case for this test was wrong, the source of the alternate
code sequence is:
FTR_SECTION_ELSE
2: or 2,2,2
PPC_LCMPI r3,1
beq 3f
blt 2b
b 3f
b 1b
ALT_FTR_SECTION_END(0, 1)
3: or 1,1,1
or 2,2,2
4: or 3,3,3
So when it's patched the '3' label should still be on the 'or 1,1,1',
and the 4 label is irrelevant and can be removed.
Fixes: 362e7701fd ("powerpc: Add self-tests of the feature fixup code")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
If the systbl_chk.sh checks fail we print a message, but with no
indication that it's an error. That makes it hard to find in build
logs with eg. grep.
So prefix any output with "Error:".
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
it had always been pointless - compat_sys_select() sign-extends
the first argument just fine on its own.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[mpe: Use COMPAT_SPU_NEW() to keep systbl_chk.sh happy]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Currently the select system call is wired up with the SYSX_SPU()
macro. The SYSX_SPU() is not handled by systbl_chk.c, which means the
syscall number for select is not checked.
That hides the fact that the syscall number for select is actually
__NR__newselect not __NR_select.
In a following patch we'd like to drop ppc32_select() which means
select will become a regular COMPAT_SYS_SPU() syscall. But
COMPAT_SYS_SPU() can't deal with the fact that the syscall number is
actually __NR__newselect. We also can't just redefine __NR_select
because that's still used for the old select call.
So add a new COMPAT_NEW_SPU() that does the same thing as
COMPAT_SYS_SPU() except it encodes that we're using the new number.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[mpe: Fix sys_debug_setcontext() prototype to return long]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
The "Power Architecture 64-Bit ELF V2 ABI" says in section 2.3.2.3:
[...] There are several rules that must be adhered to in order to ensure
reliable and consistent call chain backtracing:
* Before a function calls any other function, it shall establish its
own stack frame, whose size shall be a multiple of 16 bytes.
– In instances where a function’s prologue creates a stack frame, the
back-chain word of the stack frame shall be updated atomically with
the value of the stack pointer (r1) when a back chain is implemented.
(This must be supported as default by all ELF V2 ABI-compliant
environments.)
[...]
– The function shall save the link register that contains its return
address in the LR save doubleword of its caller’s stack frame before
calling another function.
To me this sounds like the equivalent of HAVE_RELIABLE_STACKTRACE.
This patch may be unneccessarily limited to ppc64le, but OTOH the only
user of this flag so far is livepatching, which is only implemented on
PPCs with 64-LE, a.k.a. ELF ABI v2.
Feel free to add other ppc variants, but so far only ppc64le got tested.
This change also implements save_stack_trace_tsk_reliable() for ppc64le
that checks for the above conditions, where possible.
Signed-off-by: Torsten Duwe <duwe@suse.de>
Signed-off-by: Nicolai Stange <nstange@suse.de>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Provide timebase and timebase of last heartbeat in watchdog lockup
messages. Also provide a stack trace of when a CPU becomes un-stuck,
which can be useful -- it could be where irqs are re-enabled, so it
may be the end of the critical section which is responsible for the
latency which is useful information.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
The watchdog heartbeat timestamp is updated when the local heartbeat
timer fires (or touch_nmi_watchdog() is called).
This is an interesting data point, so don't overwrite it when the
soft-NMI interrupt detects a hard lockup. That code came from a pre-
merge version to prevent hard lockup messages flood, but that's taken
care of with the stuck CPU logic now, so there is no reason to
update the heartbeat timestamp here.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This is not the case for the moment, but future releases of pHyp might
need to introduce some synchronisation routines under the hood which
would make the XIVE hcalls longer to complete.
As this was done for H_INT_RESET, let's wrap the other hcalls in a
loop catching the H_LONG_BUSY_* codes.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
The hcall H_INT_RESET should be called to make sure XIVE is fully
reseted.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
The hcall H_INT_RESET can take some time to complete and in such cases
it returns H_LONG_BUSY_* codes requiring the machine to sleep for a
while before retrying.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
The kexec_state KEXEC_STATE_IRQS_OFF barrier is reached by all
secondary CPUs before the kexec_cpu_down() operation is called on
secondaries. This can raise conflicts and provoque errors in the XIVE
hcalls when XIVE is shutdown with H_INT_RESET on the primary CPU.
To synchronize the kexec_cpu_down() operations and make sure the
secondaries have completed their task before the primary starts doing
the same, let's move the primary kexec_cpu_down() after the
KEXEC_STATE_REAL_MODE barrier.
This change of the ending sequence of kexec is mostly useful on the
pseries platform but it impacts also the powernv, ps3 and 85xx
platforms. powernv can be easily tested and fixed but some caution is
required for the other two.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
For consideration:
* Add NVDIMM support - Enables greater testing, mambo device.
* Add IPv6 support built in + additional modules - Because it's 2018 maan.
* Add DEFERRED_STRUCT_PAGE_INIT - Let's see what breaks.
* Add PPC_MEMTRACE - Small powernv debugfs driver for getting hardware traces.
* Add MEMORY_FAILURE - Machine check exceptions can now drive memory failure.
* Turn on FANOTIFY - This is the current filesystem notification feature.
* Turn on SCOM_DEBUGFS - Handy for hardware/firmware debugging, security risk?
* Turn on async SCSI scanning - Let's see what breaks.
* Add MLX5 driver as a module - Popular demand.
* Add CRYPTO_CRCT10DIF_VPMSUM - POWER8 T10DIF acceleration.
* Make a bunch of USB hid drivers modules.
* Make SCSI SG, SR, and FC modules - FC is huge.
* Make video drivers except AST GPU modules - Also huge.
* Make PCI serial driver a module - Uncommon.
* Make more things modules, NFS FS, RAM disk, netconsole, MS-DOS fs.
* Get rid of /dev/port - Not used.
* Remove PPS and PTP subsystms - Unusual.
* Remove legacy BSD ttys - Long dead.
* Remove IDE - Deprecated and replaced with ATA.
* Remove WIRELESS - Until we get POWER9 laptops.
* Remove RAW - Long deprecated in favour of direct IO.
* Remove floppy, parport, and PS2 input devices - not supported.
* Remove virtio drivers, ballooning - We're host only.
* Remove PPP - Sorry Paulus.
This results in a significantly smaller vmlinux:
text data bss dec filename
13143383 5277944 1317856 19739183 vanilla
12263281 4852074 1341720 18457075 patched
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
The B43 driver only needs CONFIG_SSB to support the WLAN card found in
the Wii. Configure it accordingly, and disable BCMA bus support to save
a bit of space.
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This allows access to the SD card and the BCM4318 Wifi module.
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
