From bdab18633a302c82b5e5d5dbc4e38b0baf9c0837 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 20 Sep 2026 08:15:23 -0700 Subject: Merge tag 'locking-urgent-2026-09-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull futex fix from Ingo Molnar: - Also allocate a default private futex hash on vfork() as well, to avoid races with (private) futex waiters (Peter Zijlstra) * tag 'locking-urgent-2026-09-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: futex: Also allocate private hash on vfork() --- tools/perf/util/cacheline.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 tools/perf/util/cacheline.c (limited to 'tools/perf/util/cacheline.c') diff --git a/tools/perf/util/cacheline.c b/tools/perf/util/cacheline.c new file mode 100644 index 000000000..e98b5250a --- /dev/null +++ b/tools/perf/util/cacheline.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "cacheline.h" +#include + +#ifdef _SC_LEVEL1_DCACHE_LINESIZE +#define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE) +#else +#include +#include "debug.h" +static void cache_line_size(int *cacheline_sizep) +{ + if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size", cacheline_sizep)) + pr_debug("cannot determine cache line size"); +} +#endif + +int cacheline_size(void) +{ + static int size; + + if (!size) + cache_line_size(&size); + + return size; +} -- cgit v1.3.1