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mm: kmemleak: remove kmemleak_not_leak_phys() and the min_count argument to kmemleak_alloc_phys()

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Patch series "mm: kmemleak: store objects allocated with physical address
separately and check when scan", v4.

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

v3: https://lore.kernel.org/r/20220609124950.1694394-1-patrick.wang.shcn@gmail.com
v2: https://lore.kernel.org/r/20220603035415.1243913-1-patrick.wang.shcn@gmail.com
v1: https://lore.kernel.org/r/20220531150823.1004101-1-patrick.wang.shcn@gmail.com


This patch (of 4):

Remove the unused kmemleak_not_leak_phys() function.  And remove the
min_count argument to kmemleak_alloc_phys() function, assume it's 0.

Link: https://lkml.kernel.org/r/20220611035551.1823303-1-patrick.wang.shcn@gmail.com
Link: https://lkml.kernel.org/r/20220611035551.1823303-2-patrick.wang.shcn@gmail.com
Signed-off-by: Patrick Wang <patrick.wang.shcn@gmail.com>
Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Yee Lee <yee.lee@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Patrick Wang 2022-06-11 11:55:48 +08:00 • committed by akpm
parent ed913b055a
commit c200d90049
6 changed files with 14 additions and 33 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
Documentation/dev-tools/kmemleak.rst
View file

@ -174,7 +174,6 @@ mapping:
- ``kmemleak_alloc_phys``
- ``kmemleak_free_part_phys``
- ``kmemleak_not_leak_phys``
- ``kmemleak_ignore_phys``
Dealing with false positives/negatives

2
drivers/of/fdt.c
View file

@ -529,7 +529,7 @@ static int __init __reserved_mem_reserve_reg(unsigned long node,
pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %lu MiB\n",
uname, &base, (unsigned long)(size / SZ_1M));
if (!nomap)
kmemleak_alloc_phys(base, size, 0, 0);
kmemleak_alloc_phys(base, size, 0);
}
else
pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %lu MiB\n",

8
include/linux/kmemleak.h
View file

@ -29,10 +29,9 @@ extern void kmemleak_not_leak(const void *ptr) __ref;
extern void kmemleak_ignore(const void *ptr) __ref;
extern void kmemleak_scan_area(const void *ptr, size_t size, gfp_t gfp) __ref;
extern void kmemleak_no_scan(const void *ptr) __ref;
extern void kmemleak_alloc_phys(phys_addr_t phys, size_t size, int min_count,
extern void kmemleak_alloc_phys(phys_addr_t phys, size_t size,
gfp_t gfp) __ref;
extern void kmemleak_free_part_phys(phys_addr_t phys, size_t size) __ref;
extern void kmemleak_not_leak_phys(phys_addr_t phys) __ref;
extern void kmemleak_ignore_phys(phys_addr_t phys) __ref;
static inline void kmemleak_alloc_recursive(const void *ptr, size_t size,
@ -107,15 +106,12 @@ static inline void kmemleak_no_scan(const void *ptr)
{
}
static inline void kmemleak_alloc_phys(phys_addr_t phys, size_t size,
int min_count, gfp_t gfp)
gfp_t gfp)
{
}
static inline void kmemleak_free_part_phys(phys_addr_t phys, size_t size)
{
}
static inline void kmemleak_not_leak_phys(phys_addr_t phys)
{
}
static inline void kmemleak_ignore_phys(phys_addr_t phys)
{
}

20
mm/kmemleak.c
View file

@ -1125,15 +1125,13 @@ EXPORT_SYMBOL(kmemleak_no_scan);
* address argument
* @phys: physical address of the object
* @size: size of the object
* @min_count: minimum number of references to this object.
* See kmemleak_alloc()
* @gfp: kmalloc() flags used for kmemleak internal memory allocations
*/
void __ref kmemleak_alloc_phys(phys_addr_t phys, size_t size, int min_count,
gfp_t gfp)
void __ref kmemleak_alloc_phys(phys_addr_t phys, size_t size, gfp_t gfp)
{
if (PHYS_PFN(phys) >= min_low_pfn && PHYS_PFN(phys) < max_low_pfn)
kmemleak_alloc(__va(phys), size, min_count, gfp);
/* assume min_count 0 */
kmemleak_alloc(__va(phys), size, 0, gfp);
}
EXPORT_SYMBOL(kmemleak_alloc_phys);
@ -1151,18 +1149,6 @@ void __ref kmemleak_free_part_phys(phys_addr_t phys, size_t size)
}
EXPORT_SYMBOL(kmemleak_free_part_phys);
/**
* kmemleak_not_leak_phys - similar to kmemleak_not_leak but taking a physical
* address argument
* @phys: physical address of the object
*/
void __ref kmemleak_not_leak_phys(phys_addr_t phys)
{
if (PHYS_PFN(phys) >= min_low_pfn && PHYS_PFN(phys) < max_low_pfn)
kmemleak_not_leak(__va(phys));
}
EXPORT_SYMBOL(kmemleak_not_leak_phys);
/**
* kmemleak_ignore_phys - similar to kmemleak_ignore but taking a physical
* address argument

14
mm/memblock.c
View file

@ -1345,8 +1345,8 @@ __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
* from the regions with mirroring enabled and then retried from any
* memory region.
*
* In addition, function sets the min_count to 0 using kmemleak_alloc_phys for
* allocated boot memory block, so that it is never reported as leaks.
* In addition, function using kmemleak_alloc_phys for allocated boot
* memory block, it is never reported as leaks.
*
* Return:
* Physical address of allocated memory block on success, %0 on failure.
@ -1398,12 +1398,12 @@ done:
*/
if (end != MEMBLOCK_ALLOC_NOLEAKTRACE)
/*
* The min_count is set to 0 so that memblock allocated
* blocks are never reported as leaks. This is because many
* of these blocks are only referred via the physical
* address which is not looked up by kmemleak.
* Memblock allocated blocks are never reported as
* leaks. This is because many of these blocks are
* only referred via the physical address which is
* not looked up by kmemleak.
*/
kmemleak_alloc_phys(found, size, 0, 0);
kmemleak_alloc_phys(found, size, 0);
return found;
}

2
tools/testing/memblock/linux/kmemleak.h
View file

@ -7,7 +7,7 @@ static inline void kmemleak_free_part_phys(phys_addr_t phys, size_t size)
}
static inline void kmemleak_alloc_phys(phys_addr_t phys, size_t size,
int min_count, gfp_t gfp)
gfp_t gfp)
{
}