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| author |   Ingo Molnar <mingo@kernel.org> | 2025-05-16 15:43:04 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-10-23 16:24:35 +0200 |
| commit | 0fe5e3f5fb75c5d88dad24dece3ee75e9d87adeb (patch) | |
| tree | 103544b9ee4a15ba861508ea73b5c7373a264ee0 /tools/perf/scripts/python/bin/ssh:/git@git.zx2c4.com/git: | |
| parent | cxl/features: Add check for no entries in cxl_feature_info (diff) | |
x86/mm: Fix SMP ordering in switch_mm_irqs_off()
[ Upstream commit 83b0177a6c4889b3a6e865da5e21b2c9d97d0551 ]
Stephen noted that it is possible to not have an smp_mb() between
the loaded_mm store and the tlb_gen load in switch_mm(), meaning the
ordering against flush_tlb_mm_range() goes out the window, and it
becomes possible for switch_mm() to not observe a recent tlb_gen
update and fail to flush the TLBs.
[ dhansen: merge conflict fixed by Ingo ]
Fixes: 209954cbc7d0 ("x86/mm/tlb: Update mm_cpumask lazily")
Reported-by: Stephen Dolan <sdolan@janestreet.com>
Closes: https://lore.kernel.org/all/CAHDw0oGd0B4=uuv8NGqbUQ_ZVmSheU2bN70e4QhFXWvuAZdt2w@mail.gmail.com/
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/bin/ssh:/git@git.zx2c4.com/git:')
0 files changed, 0 insertions, 0 deletions