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| author | Qian Cai | 2019-08-01 16:47:05 +0200 |
|---|---|---|
| committer | Will Deacon | 2019-08-01 16:53:10 +0200 |
| commit | 7732d20a160c76006c7fe7bca5178aea6af1d2e8 (patch) | |
| tree | da13a782c8a276a2e18c1e8d7a47f019e18d337b /arch/arm64 | |
| parent | arm64/mm: fix variable 'pud' set but not used (diff) | |
| download | kernel-qcow2-linux-7732d20a160c76006c7fe7bca5178aea6af1d2e8.tar.gz kernel-qcow2-linux-7732d20a160c76006c7fe7bca5178aea6af1d2e8.tar.xz kernel-qcow2-linux-7732d20a160c76006c7fe7bca5178aea6af1d2e8.zip | |
arm64/mm: fix variable 'tag' set but not used
When CONFIG_KASAN_SW_TAGS=n, set_tag() is compiled away. GCC throws a
warning,
mm/kasan/common.c: In function '__kasan_kmalloc':
mm/kasan/common.c:464:5: warning: variable 'tag' set but not used
[-Wunused-but-set-variable]
u8 tag = 0xff;
^~~
Fix it by making __tag_set() a static inline function the same as
arch_kasan_set_tag() in mm/kasan/kasan.h for consistency because there
is a macro in arch/arm64/include/asm/kasan.h,
#define arch_kasan_set_tag(addr, tag) __tag_set(addr, tag)
However, when CONFIG_DEBUG_VIRTUAL=n and CONFIG_SPARSEMEM_VMEMMAP=y,
page_to_virt() will call __tag_set() with incorrect type of a
parameter, so fix that as well. Also, still let page_to_virt() return
"void *" instead of "const void *", so will not need to add a similar
cast in lowmem_page_address().
Signed-off-by: Qian Cai <cai@lca.pw>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/memory.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index b7ba75809751..fb04f10a78ab 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -210,7 +210,11 @@ extern u64 vabits_user; #define __tag_reset(addr) untagged_addr(addr) #define __tag_get(addr) (__u8)((u64)(addr) >> 56) #else -#define __tag_set(addr, tag) (addr) +static inline const void *__tag_set(const void *addr, u8 tag) +{ + return addr; +} + #define __tag_reset(addr) (addr) #define __tag_get(addr) 0 #endif @@ -301,8 +305,8 @@ static inline void *phys_to_virt(phys_addr_t x) #define page_to_virt(page) ({ \ unsigned long __addr = \ ((__page_to_voff(page)) | PAGE_OFFSET); \ - unsigned long __addr_tag = \ - __tag_set(__addr, page_kasan_tag(page)); \ + const void *__addr_tag = \ + __tag_set((void *)__addr, page_kasan_tag(page)); \ ((void *)__addr_tag); \ }) |