Daniel Borkmann 6b7a21140f tools: add smp_* barrier variants to include infrastructure ... Add the definition for smp_rmb(), smp_wmb(), and smp_mb() to the tools include infrastructure: this patch adds the implementation for x86-64 and arm64, and have it fall back as currently is for other archs which do not have it implemented at this point. The x86-64 one uses lock + add combination for smp_mb() with address below red zone. This is on top of 09d62154f6 ("tools, perf: add and use optimized ring_buffer_{read_head, write_tail} helpers"), which didn't touch smp_* barrier implementations. Magnus recently rightfully reported however that the latter on x86-64 still wrongly falls back to sfence, lfence and mfence respectively, thus fix that for applications under tools making use of these to avoid such ugly surprises. The main header under tools (include/asm/barrier.h) will in that case not select the fallback implementation. Reported-by: Magnus Karlsson <magnus.karlsson@intel.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2019-04-11 14:45:50 -07:00
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alpha/include	tools include arch: Grab a copy of errno.h for arch's supported by perf	2018-01-23 09:51:37 -03:00
arc/include/uapi/asm	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
arm/include	tools headers uapi: Update tools's copies of kvm headers	2018-09-11 13:09:26 -03:00
arm64/include	tools: add smp_* barrier variants to include infrastructure	2019-04-11 14:45:50 -07:00
h8300/include	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
hexagon/include/uapi/asm	License cleanup: add SPDX license identifier to uapi header files with a license	2017-11-02 11:20:11 +01:00
ia64/include	tools, perf: add and use optimized ring_buffer_{read_head, write_tail} helpers	2018-10-19 13:43:08 -07:00
microblaze/include/uapi/asm	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
mips/include	tools include arch: Grab a copy of errno.h for arch's supported by perf	2018-01-23 09:51:37 -03:00
parisc/include/uapi/asm	parisc: Drop architecture-specific ENOTSUP define	2018-08-13 09:30:41 +02:00
powerpc/include	powerpc fixes for 5.0 #3	2019-01-19 05:55:42 +12:00
riscv/include/uapi/asm	tools uapi: fix RISC-V 64-bit support	2019-01-07 07:59:28 -08:00
s390/include	tools headers: Sync the various kvm.h header copies	2018-10-31 09:57:53 -03:00
sh/include	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
sparc/include	tools, perf: add and use optimized ring_buffer_{read_head, write_tail} helpers	2018-10-19 13:43:08 -07:00
x86	tools: add smp_* barrier variants to include infrastructure	2019-04-11 14:45:50 -07:00
xtensa/include	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00