From: Miaohe Lin <linmiaohe@huawei.com>
To: <akpm@linux-foundation.org>
Cc: <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>,
<linmiaohe@huawei.com>
Subject: [PATCH] mm/memremap: avoid calling kasan_remove_zero_shadow() for device private memory
Date: Wed, 26 Jan 2022 17:26:02 +0800 [thread overview]
Message-ID: <20220126092602.1425-1-linmiaohe@huawei.com> (raw)
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.
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
---
mm/memremap.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/memremap.c b/mm/memremap.c
index d2a72cf2ff83..d9e05952fff6 100644
--- a/mm/memremap.c
+++ b/mm/memremap.c
@@ -302,7 +302,8 @@ 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:
--
2.23.0
next reply other threads:[~2022-01-26 9:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-26 9:26 Miaohe Lin [this message]
2022-01-26 10:06 ` [PATCH] mm/memremap: avoid calling kasan_remove_zero_shadow() for device private memory Muchun Song
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