slub: Make CONFIG_DEBUG_PAGE_ALLOC work with new fastpath

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Fastpath can do a speculative access to a page that CONFIG_DEBUG_PAGE_ALLOC may have
marked as invalid to retrieve the pointer to the next free object.

Use probe_kernel_read in that case in order not to cause a page fault.

Cc: <stable@kernel.org> # 38.x
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

...

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Christoph Lameter 2011-05-16 15:26:08 -05:00 • committed by Pekka Enberg

parent 6332aa9d25

commit 1393d9a185

1 changed files with 13 additions and 1 deletions

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mm/slub.c

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