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asm-generic: improve the flush_dcache_page stub

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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>
This commit is contained in:
Christoph Hellwig 2020-06-07 21:41:45 -07:00 committed by Linus Torvalds
parent e0cf615d72
commit 76b3b58fac
1 changed files with 3 additions and 3 deletions
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6
include/asm-generic/cacheflush.h
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@ -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)
{