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mm, memcg: fix corruption on 64-bit divisor in memory.high throttling
Commit 0e4b01d had a bunch of fixups to use the right division method. However, it seems that after all that it still wasn't right -- div_u64 takes a 32-bit divisor. The headroom is still large (2^32 pages), so on mundane systems you won't hit this, but this should definitely be fixed. Fixes: 0e4b01d ("mm, memcg: throttle allocators when failing reclaim over memory.high") Reported-by: Johannes Weiner <[email protected]> Signed-off-by: Chris Down <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Acked-by: Johannes Weiner <[email protected]> Cc: Tejun Heo <[email protected]> Cc: Roman Gushchin <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Nathan Chancellor <[email protected]> Cc: <[email protected]> [5.4.x+] Link: http://lkml.kernel.org/r/80780887060514967d414b3cd91f9a316a16ab98.1584036142.git.chris@chrisdown.name Signed-off-by: Linus Torvalds <[email protected]>
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