linux-kernel - [PATCH v2 0/4] mm: kmemleak: store objects allocated with physical address separately and check when scan

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Date:   Fri,  3 Jun 2022 11:54:11 +0800
From:   Patrick Wang <patrick.wang.shcn@...il.com>
To:     catalin.marinas@....com, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        yee.lee@...iatek.com, patrick.wang.shcn@...il.com
Subject: [PATCH v2 0/4] mm: kmemleak: store objects allocated with physical address separately and check when scan

The kmemleak_*_phys() interface uses "min_low_pfn" and
"max_low_pfn" to check address. But on some architectures,
kmemleak_*_phys() is called before those two variables
initialized. The following steps will be taken:

1) Add OBJECT_PHYS flag and rbtree for the objects allocated
   with physical address
2) Store physical address in objects if allocated with OBJECT_PHYS
3) Check the boundary when scan instead of in kmemleak_*_phys()

This patch set will solve:
https://lore.kernel.org/r/20220527032504.30341-1-yee.lee@mediatek.com
https://lore.kernel.org/r/9dd08bb5-f39e-53d8-f88d-bec598a08c93@gmail.com

v1: https://lore.kernel.org/r/20220531150823.1004101-1-patrick.wang.shcn@gmail.com

v1->v2:
 - add rbtree for the objects allocated with physical address
 - store physical address in objects if allocated with OBJECT_PHYS
 - check the upper object boundary as well and avoid duplicate check

Patrick Wang (4):
  mm: kmemleak: add OBJECT_PHYS flag for objects allocated with physical
    address
  mm: kmemleak: add rbtree for objects allocated with physical address
  mm: kmemleak: handle address stored in object based on its type
  mm: kmemleak: kmemleak_*_phys() set address type and check PA when
    scan

 mm/kmemleak.c | 193 ++++++++++++++++++++++++++++++++------------------
 1 file changed, 123 insertions(+), 70 deletions(-)

-- 
2.25.1