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mm: kfence: apply kmemleak_ignore_phys on early allocated pool

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This patch solves two issues.

(1) The pool allocated by memblock needs to unregister from
kmemleak scanning. Apply kmemleak_ignore_phys to replace the
original kmemleak_free as its address now is stored in the phys tree.

(2) The pool late allocated by page-alloc doesn't need to unregister.
Move out the freeing operation from its call path.

Link: https://lkml.kernel.org/r/20220628113714.7792-2-yee.lee@mediatek.com
Fixes: 0c24e06119 ("mm: kmemleak: add rbtree and store physical address for objects allocated with PA")
Signed-off-by: Yee Lee <yee.lee@mediatek.com>
Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Suggested-by: Marco Elver <elver@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Yee Lee 2022-06-28 19:37:11 +08:00 committed by akpm
parent 14c99d6594
commit 07313a2b29
1 changed files with 9 additions and 9 deletions
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18
mm/kfence/core.c
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@ -603,14 +603,6 @@ static unsigned long kfence_init_pool(void)
addr += 2 * PAGE_SIZE;
}
/*
* The pool is live and will never be deallocated from this point on.
* Remove the pool object from the kmemleak object tree, as it would
* otherwise overlap with allocations returned by kfence_alloc(), which
* are registered with kmemleak through the slab post-alloc hook.
*/
kmemleak_free(__kfence_pool);
return 0;
}
@ -623,8 +615,16 @@ static bool __init kfence_init_pool_early(void)
addr = kfence_init_pool();
if (!addr)
if (!addr) {
/*
* The pool is live and will never be deallocated from this point on.
* Ignore the pool object from the kmemleak phys object tree, as it would
* otherwise overlap with allocations returned by kfence_alloc(), which
* are registered with kmemleak through the slab post-alloc hook.
*/
kmemleak_ignore_phys(__pa(__kfence_pool));
return true;
}
/*
* Only release unprotected pages, and do not try to go back and change