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| author | Jan Kara <jack@suse.cz> | 2021-09-02 14:53:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-09-03 09:58:10 -0700 |
| commit | 20792ebf3eeb828a692b29f3000673cb9ca83c3a (patch) | |
| tree | da1d233b22e10d2824da430b27af639b0c502156 /samples | |
| parent | 42dd235cb15c06c8446f9aed695648a3c2eb8d11 (diff) | |
| download | linux-20792ebf3eeb828a692b29f3000673cb9ca83c3a.tar.gz | |
writeback: use READ_ONCE for unlocked reads of writeback stats
We do some unlocked reads of writeback statistics like avg_write_bandwidth, dirty_ratelimit, or bw_time_stamp. Generally we are fine with getting somewhat out-of-date values but actually getting different values in various parts of the functions because the compiler decided to reload value from original memory location could confuse calculations. Use READ_ONCE for these unlocked accesses and WRITE_ONCE for the updates to be on the safe side. Link: https://lkml.kernel.org/r/20210713104716.22868-5-jack@suse.cz Signed-off-by: Jan Kara <jack@suse.cz> Cc: Michael Stapelberg <stapelberg+linux@google.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'samples')
0 files changed, 0 insertions, 0 deletions