The patch titled
Subject: mm/memremap: avoid calling kasan_remove_zero_shadow() for device private memory
has been added to the -mm tree. Its filename is
mm-memremap-avoid-calling-kasan_remove_zero_shadow-for-device-private-memory.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-memremap-avoid-calling-kasan_remove_zero_shadow-for-device-private-memory.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-memremap-avoid-calling-kasan_remove_zero_shadow-for-device-private-memory.patch
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------------------------------------------------------
From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memremap.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/mm/memremap.c~mm-memremap-avoid-calling-kasan_remove_zero_shadow-for-device-private-memory
+++ a/mm/memremap.c
@@ -302,7 +302,8 @@ static int pagemap_range(struct dev_page
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:
_
Patches currently in -mm which might be from linmiaohe@xxxxxxxxxx are
mm-memremap-avoid-calling-kasan_remove_zero_shadow-for-device-private-memory.patch
mm-vmalloc-remove-unneeded-function-forward-declaration.patch
mm-balloon_compaction-make-balloon-page-compaction-callbacks-static.patch
mm-hmmc-remove-unneeded-local-variable-ret.patch
