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| author | Miaohe Lin <linmiaohe@huawei.com> | 2022-03-22 14:39:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-03-22 15:57:01 -0700 |
| commit | a74c6c00b1cb56386a98c2f2615f8966b3d1034d (patch) | |
| tree | 556169c9eed0f07da222104cb3a56f3ab19fa14c /mm/memremap.c | |
| parent | a128b054ce029554a4a52fc3abb8c1df8bafcaef (diff) | |
| download | lwn-a74c6c00b1cb56386a98c2f2615f8966b3d1034d.tar.gz lwn-a74c6c00b1cb56386a98c2f2615f8966b3d1034d.zip | |
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>
Diffstat (limited to 'mm/memremap.c')
| -rw-r--r-- | mm/memremap.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/memremap.c b/mm/memremap.c index 6aa5f0c2d11f..4d73533d8ca7 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -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: |