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Eduard Zingerman c302378bc1 libbpf: Hashmap interface update to allow both long and void* keys/values 
An update for libbpf's hashmap interface from void* -> void* to a
polymorphic one, allowing both long and void* keys and values.

This simplifies many use cases in libbpf as hashmaps there are mostly
integer to integer.

Perf copies hashmap implementation from libbpf and has to be
updated as well.

Changes to libbpf, selftests/bpf and perf are packed as a single
commit to avoid compilation issues with any future bisect.

Polymorphic interface is acheived by hiding hashmap interface
functions behind auxiliary macros that take care of necessary
type casts, for example:

    #define hashmap_cast_ptr(p)						\
	({								\
		_Static_assert((p) == NULL || sizeof(*(p)) == sizeof(long),\
			       #p " pointee should be a long-sized integer or a pointer"); \
		(long *)(p);						\
	})

    bool hashmap_find(const struct hashmap *map, long key, long *value);

    #define hashmap__find(map, key, value) \
		hashmap_find((map), (long)(key), hashmap_cast_ptr(value))

- hashmap__find macro casts key and value parameters to long
  and long* respectively
- hashmap_cast_ptr ensures that value pointer points to a memory
  of appropriate size.

This hack was suggested by Andrii Nakryiko in [1].
This is a follow up for [2].

[1] https://lore.kernel.org/bpf/CAEf4BzZ8KFneEJxFAaNCCFPGqp20hSpS2aCj76uRk3-qZUH5xg@mail.gmail.com/
[2] https://lore.kernel.org/bpf/af1facf9-7bc8-8a3d-0db4-7b3f333589a2@meta.com/T/#m65b28f1d6d969fcd318b556db6a3ad499a42607d

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20221109142611.879983-2-eddyz87@gmail.com
2022-11-09 20:45:14 -08:00
..
attr perf test: Fix attr tests for PERF_FORMAT_LOST 2022-10-15 10:13:16 -03:00
shell perf test: Do not fail Intel-PT misc test w/o libpython 2022-10-25 17:40:48 -03:00
.gitignore
api-io.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
attr.c perf cpumap: Give CPUs their own type 2022-01-12 14:28:23 -03:00
attr.py
backward-ring-buffer.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
bitmap.c perf cpumap: Migrate to libperf cpumap api 2022-01-22 17:08:42 -03:00
bp_account.c perf test: Fix variable length array undefined behavior in bp_account 2022-06-19 10:41:43 -03:00
bp_signal.c perf test: BP tests, remove is_supported use 2021-11-13 18:11:50 -03:00
bp_signal_overflow.c perf test: BP tests, remove is_supported use 2021-11-13 18:11:50 -03:00
bpf-script-example.c perf bpf: Convert legacy map definition to BTF-defined 2022-08-01 14:43:13 -03:00
bpf-script-test-kbuild.c
bpf-script-test-prologue.c
bpf-script-test-relocation.c
bpf.c perf test bpf: Skip test if clang is not present 2022-05-21 14:54:21 -03:00
Build perf test: Refactor shell tests allowing subdirs 2022-08-13 15:13:20 -03:00
builtin-test-list.c perf test: Refactor shell tests allowing subdirs 2022-08-13 15:13:20 -03:00
builtin-test-list.h perf test: Refactor shell tests allowing subdirs 2022-08-13 15:13:20 -03:00
builtin-test.c perf test: Refactor shell tests allowing subdirs 2022-08-13 15:13:20 -03:00
clang.c perf test: Remove skip_if_fail 2021-11-13 18:11:50 -03:00
code-reading.c perf tools: Do not pass NULL to parse_events() 2022-08-10 14:30:09 -03:00
cpumap.c perf cpumap: Add range data encoding 2022-10-04 08:55:21 -03:00
demangle-java-test.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
demangle-ocaml-test.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
dlfilter-test.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
dso-data.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
dwarf-unwind.c perf unwind: Don't show unwind error messages when augmenting frame pointer stack 2022-04-09 12:34:29 -03:00
event-times.c perf tools: Do not pass NULL to parse_events() 2022-08-10 14:30:09 -03:00
event_update.c perf events: Prefer union over variable length array 2022-10-04 08:55:21 -03:00
evsel-roundtrip-name.c perf tools: Do not pass NULL to parse_events() 2022-08-10 14:30:09 -03:00
evsel-tp-sched.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
expand-cgroup.c perf pmu-events: Hide the pmu_events 2022-08-13 15:02:08 -03:00
expr.c libbpf: Hashmap interface update to allow both long and void* keys/values 2022-11-09 20:45:14 -08:00
fdarray.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
genelf.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
hists_common.c
hists_common.h
hists_cumulate.c perf tools: Do not pass NULL to parse_events() 2022-08-10 14:30:09 -03:00
hists_filter.c perf tools: Do not pass NULL to parse_events() 2022-08-10 14:30:09 -03:00
hists_link.c perf tools: Do not pass NULL to parse_events() 2022-08-10 14:30:09 -03:00
hists_output.c perf tools: Do not pass NULL to parse_events() 2022-08-10 14:30:09 -03:00
is_printable_array.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
keep-tracking.c perf tools: Do not pass NULL to parse_events() 2022-08-10 14:30:09 -03:00
kmod-path.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
llvm.c perf: Stop using bpf_object__open_buffer() API 2022-01-24 20:44:09 -08:00
llvm.h
make
maps.c perf test: Use pointer for maps 2022-02-14 16:51:03 -03:00
mem.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
mem2node.c perf cpumap: Migrate to libperf cpumap api 2022-01-22 17:08:42 -03:00
mmap-basic.c perf tests: Avoid pthread.h inclusion 2022-10-04 08:55:19 -03:00
mmap-thread-lookup.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
openat-syscall-all-cpus.c perf tests: Avoid pthread.h inclusion 2022-10-04 08:55:19 -03:00
openat-syscall-tp-fields.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
openat-syscall.c perf test: Use skip in openat syscall 2022-05-23 10:01:57 -03:00
parse-events.c perf test: Parse events break apart tests 2022-05-23 10:04:59 -03:00
parse-metric.c perf pmu-events: Hide the pmu_events 2022-08-13 15:02:08 -03:00
parse-no-sample-id-all.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
pe-file-parsing.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
pe-file.c
pe-file.exe
pe-file.exe.debug
perf-hooks.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
perf-record.c perf tests: Avoid pthread.h inclusion 2022-10-04 08:55:19 -03:00
perf-targz-src-pkg
perf-time-to-tsc.c perf test: Fix double word in comments 2022-08-12 16:42:55 -03:00
pfm.c perf test: Remove skip_if_fail 2021-11-13 18:11:50 -03:00
pmu-events.c libbpf: Hashmap interface update to allow both long and void* keys/values 2022-11-09 20:45:14 -08:00
pmu.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
python-use.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
sample-parsing.c perf tools: Support reading PERF_FORMAT_LOST 2022-08-19 15:56:56 -03:00
sdt.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
sigtrap.c perf test: Skip sigtrap test on old kernels 2022-10-04 08:55:22 -03:00
stat.c perf cpumap: Give CPUs their own type 2022-01-12 14:28:23 -03:00
sw-clock.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
switch-tracking.c perf tools: Add evlist__add_sched_switch() 2022-10-06 08:03:53 -03:00
task-exit.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
tests.h perf test sigtrap: Add basic stress test for sigtrap handling 2021-12-07 22:18:23 -03:00
thread-map.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
thread-maps-share.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
time-utils-test.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
topology.c perf stat: Rename to aggr_cpu_id.thread_idx 2022-10-06 08:03:53 -03:00
unit_number__scnprintf.c perf test: Rename struct test to test_suite 2021-11-13 10:32:22 -03:00
vmlinux-kallsyms.c perf tests vmlinux-kallsyms: Update is_ignored_symbol function to match the kernel ignored list 2022-09-28 11:11:33 -03:00
wp.c perf test: Skip wp modify test on old kernels 2022-09-21 16:07:32 -03:00