Commit a74c6c00 authored by Miaohe Lin's avatar Miaohe Lin Committed by Linus Torvalds
Browse files

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: default avatarMiaohe Lin <linmiaohe@huawei.com>
Reviewed-by: default avatarMuchun Song <songmuchun@bytedance.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a128b054

mm/memremap.c

+2 −1
Original line number Diff line number Diff line
@@ -282,6 +282,7 @@ static int pagemap_range(struct dev_pagemap *pgmap, struct mhp_params *params, 
	return 0;



err_add_memory:

	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));