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| author |   Christoph Hellwig <hch@lst.de> | 2020-06-07 21:41:45 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-08 11:05:57 -0700 |
| commit | 76b3b58fac350c45e44a3868946ff5e454e8d367 (patch) | |
| tree | c64e7e3182116e248c426878905e48fe02c137f2 /include/asm-generic | |
| parent | asm-generic: don't include <linux/mm.h> in cacheflush.h (diff) | |
| download | wireguard-linux-76b3b58fac350c45e44a3868946ff5e454e8d367.tar.xz wireguard-linux-76b3b58fac350c45e44a3868946ff5e454e8d367.zip | |
asm-generic: improve the flush_dcache_page stub
There is a magic ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE cpp symbol that
guards non-stub availability of flush_dcache_pagge. Use that to check
if flush_dcache_pagg is implemented.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Link: http://lkml.kernel.org/r/20200515143646.3857579-8-hch@lst.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/cacheflush.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/include/asm-generic/cacheflush.h b/include/asm-generic/cacheflush.h index bf9bb83e9fc8..bbbb4d4ef651 100644 --- a/include/asm-generic/cacheflush.h +++ b/include/asm-generic/cacheflush.h @@ -2,8 +2,6 @@ #ifndef _ASM_GENERIC_CACHEFLUSH_H #define _ASM_GENERIC_CACHEFLUSH_H -#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0 - /* * The cache doesn't need to be flushed when TLB entries change when * the cache is mapped to physical memory, not virtual memory @@ -42,12 +40,14 @@ static inline void flush_cache_page(struct vm_area_struct *vma, } #endif -#ifndef flush_dcache_page +#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE static inline void flush_dcache_page(struct page *page) { } +#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0 #endif + #ifndef flush_dcache_mmap_lock static inline void flush_dcache_mmap_lock(struct address_space *mapping) { |