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| author | Yan Zhao <yan.y.zhao@intel.com> | 2024-02-02 22:05:50 +0800 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2024-03-05 18:04:20 +0100 |
| commit | 3391538f08511dae86382003ff9216026762b3a9 (patch) | |
| tree | f209aae0b3f330a62e4a463fcc0d16e36420c2bb /arch/csky | |
| parent | b401b621758e46812da61fa58a67c3fd8d91de0d (diff) | |
| download | linux-3391538f08511dae86382003ff9216026762b3a9.tar.gz linux-3391538f08511dae86382003ff9216026762b3a9.tar.bz2 linux-3391538f08511dae86382003ff9216026762b3a9.zip | |
mm: Remove broken pfn_to_virt() on arch csky/hexagon/openrisc
Remove the broken pfn_to_virt() on architectures csky/hexagon/openrisc.
The pfn_to_virt() on those architectures takes PFN instead of PA as the
input to macro __va(), with PAGE_SHIFT applying to the converted VA, which
is not right, especially when there's a non-zero offset in __va(). [1]
The broken pfn_to_virt() was noticed when checking how page_to_virt() is
unfolded on x86. It turns out that the one in linux/mm.h instead of in
asm-generic/page.h is compiled for x86. However, page_to_virt() in
asm-generic/page.h is found out expanding to pfn_to_virt() with a bug
described above. The pfn_to_virt() is found out not right as well on
architectures csky/hexagon/openrisc.
Since there's no single caller on csky/hexagon/openrisc to pfn_to_virt()
and there are functions doing similar things as pfn_to_virt() --
- pfn_to_kaddr() in asm/page.h for csky,
- page_to_virt() in asm/page.h for hexagon, and
- page_to_virt() in linux/mm.h for openrisc,
just delete the pfn_to_virt() on those architectures.
The pfn_to_virt() in asm-generic/page.h is not touched in this patch as
it's referenced by page_to_virt() in that header while the whole header is
going to be removed as a whole due to no one including it.
Link:https://lore.kernel.org/all/20240131055159.2506-1-yan.y.zhao@intel.com [1]
Cc: Linus Walleij <linus.walleij@linaro.org>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/csky')
| -rw-r--r-- | arch/csky/include/asm/page.h | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/arch/csky/include/asm/page.h b/arch/csky/include/asm/page.h index 4a0502e324a6..866855e1ab43 100644 --- a/arch/csky/include/asm/page.h +++ b/arch/csky/include/asm/page.h @@ -82,11 +82,6 @@ static inline unsigned long virt_to_pfn(const void *kaddr) return __pa(kaddr) >> PAGE_SHIFT; } -static inline void * pfn_to_virt(unsigned long pfn) -{ - return (void *)((unsigned long)__va(pfn) << PAGE_SHIFT); -} - #define MAP_NR(x) PFN_DOWN((unsigned long)(x) - PAGE_OFFSET - \ PHYS_OFFSET_OFFSET) #define virt_to_page(x) (mem_map + MAP_NR(x)) |