Takshak Chahande 56fbc24116 libbpf : make libbpf_num_possible_cpus function thread safe ... Having static variable `cpus` in libbpf_num_possible_cpus function without guarding it with mutex makes this function thread-unsafe. If multiple threads accessing this function, in the current form; it leads to incrementing the static variable value `cpus` in the multiple of total available CPUs. Used local stack variable to calculate the number of possible CPUs and then updated the static variable using WRITE_ONCE(). Changes since v1: * added stack variable to calculate cpus * serialized static variable update using WRITE_ONCE() * fixed Fixes tag Fixes: 6446b31555 ("bpf: add a new API libbpf_num_possible_cpus()") Signed-off-by: Takshak Chahande <ctakshak@fb.com> Acked-by: Andrey Ignatov <rdna@fb.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2019-07-31 20:35:19 -07:00
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api	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 251	2019-06-05 17:30:26 +02:00
bpf	libbpf : make libbpf_num_possible_cpus function thread safe	2019-07-31 20:35:19 -07:00
lockdep	lockdep/lib/tests: Test dynamic key registration	2019-02-28 07:55:48 +01:00
subcmd	tools lib subcmd: Don't add the kernel sources to the include path	2018-12-18 12:23:56 -03:00
symbol	tools perf: Move from sane_ctype.h obtained from git to the Linux's original	2019-06-25 21:02:47 -03:00
traceevent	tools lib traceevent: Man pages for trace sequences APIs	2019-05-15 16:36:48 -03:00
argv_split.c	tools lib: Move argv_{split,free} from tools/perf/util/	2019-07-01 22:50:40 -03:00
bitmap.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230	2019-06-19 17:09:06 +02:00
ctype.c	tools perf: Move from sane_ctype.h obtained from git to the Linux's original	2019-06-25 21:02:47 -03:00
find_bit.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
hweight.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
rbtree.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156	2019-05-30 11:26:35 -07:00
str_error_r.c	objtool, perf: Fix GCC 8 -Wrestrict error	2018-03-19 13:51:54 -03:00
string.c	tools lib: Adopt strreplace() from the kernel	2019-07-01 22:50:40 -03:00
vsprintf.c	perf script: Pad DSO name for --call-trace	2019-05-28 18:37:44 -03:00
zalloc.c	tools lib: Adopt zalloc()/zfree() from tools/perf	2019-07-09 10:13:26 -03:00