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author | 2020-06-04 16:47:30 -0700 | |
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committer | 2020-06-04 19:06:22 -0700 | |
commit | 525aaf9bad00e7454b9f9b3873e92795afb59f8e (patch) | |
tree | b1ad90f6b58e914258edc6ab226b62246e2802ef /include/linux/highmem.h | |
parent | arch/xtensa: move kmap build bug out of the way (diff) | |
download | linux-525aaf9bad00e7454b9f9b3873e92795afb59f8e.tar.gz linux-525aaf9bad00e7454b9f9b3873e92795afb59f8e.tar.bz2 linux-525aaf9bad00e7454b9f9b3873e92795afb59f8e.zip |
arch/kmap: remove redundant arch specific kmaps
The kmap code for all the architectures is almost 100% identical.
Lift the common code to the core. Use ARCH_HAS_KMAP_FLUSH_TLB to indicate
if an arch defines kmap_flush_tlb() and call if if needed.
This also has the benefit of changing kmap() on a number of architectures
to be an inline call rather than an actual function.
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christian König <christian.koenig@amd.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Helge Deller <deller@gmx.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20200507150004.1423069-4-ira.weiny@intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/highmem.h')
-rw-r--r-- | include/linux/highmem.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/highmem.h b/include/linux/highmem.h index ea5cdbd8c2c3..fc3adc51254a 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -34,6 +34,24 @@ static inline void invalidate_kernel_vmap_range(void *vaddr, int size) #ifdef CONFIG_HIGHMEM #include <asm/highmem.h> +#ifndef ARCH_HAS_KMAP_FLUSH_TLB +static inline void kmap_flush_tlb(unsigned long addr) { } +#endif + +void *kmap_high(struct page *page); +static inline void *kmap(struct page *page) +{ + void *addr; + + might_sleep(); + if (!PageHighMem(page)) + addr = page_address(page); + else + addr = kmap_high(page); + kmap_flush_tlb((unsigned long)addr); + return addr; +} + /* declarations for linux/mm/highmem.c */ unsigned int nr_free_highpages(void); extern atomic_long_t _totalhigh_pages; |