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mm/memremap: avoid calling kasan_remove_zero_shadow() for device private memory 

For device private memory, we do not create a linear mapping for the
memory because the device memory is un-accessible.  Thus we do not add
kasan zero shadow for it.  So it's unnecessary to do
kasan_remove_zero_shadow() for it.

Link: https://lkml.kernel.org/r/20220126092602.1425-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2022-03-22 14:39:25 -07:00 committed by Linus Torvalds
parent a128b054ce
commit a74c6c00b1
1 changed files with 2 additions and 1 deletions
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3
mm/memremap.c
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@ -282,7 +282,8 @@ static int pagemap_range(struct dev_pagemap *pgmap, struct mhp_params *params,
return 0;
err_add_memory:
kasan_remove_zero_shadow(__va(range->start), range_len(range));
if (!is_private)
kasan_remove_zero_shadow(__va(range->start), range_len(range));
err_kasan:
untrack_pfn(NULL, PHYS_PFN(range->start), range_len(range));
err_pfn_remap: