selftests/bpf: Use syscall(SYS_gettid) instead of gettid() wrapper in bench
With glibc 2.28, selftests compilation fails for benchs/bench_trigger.c: benchs/bench_trigger.c: In function ‘inc_counter’: benchs/bench_trigger.c:25:23: error: implicit declaration of function ‘gettid’; did you mean ‘getgid’? [-Werror=implicit-function-declaration] 25 | tid = gettid(); | ^~~~~~ | getgid cc1: all warnings being treated as errors It appears support for the gettid() wrapper is variable across glibc versions, so may be safer to use syscall(SYS_gettid) instead. Fixes: 520fad2e ("selftests/bpf: scale benchmark counting by using per-CPU counters") Signed-off-by:Alan Maguire <alan.maguire@oracle.com> Signed-off-by:
Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20240322095728.95671-1-alan.maguire@oracle.com
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