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parisc/kmap: remove duplicate kmap code 

parisc reimplements the kmap calls except to flush its dcache.  This is
arguably an abuse of kmap but regardless it is messy and confusing.

Remove the duplicate code and have parisc define ARCH_HAS_FLUSH_ON_KUNMAP
for a kunmap_flush_on_unmap() architecture specific call to flush the
cache.

Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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: Christoph Hellwig <hch@lst.de>
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/20200507150004.1423069-14-ira.weiny@intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ira Weiny 2020-06-04 16:48:10 -07:00 committed by Linus Torvalds
parent 8bfb1a10f2
commit 7438f36310
2 changed files with 9 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
arch/parisc/include/asm/cacheflush.h
View File

@ -100,35 +100,11 @@ flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vma
}
}
#include <asm/kmap_types.h>
#define ARCH_HAS_KMAP
static inline void *kmap(struct page *page)
{
might_sleep();
return page_address(page);
}
static inline void kunmap(struct page *page)
{
flush_kernel_dcache_page_addr(page_address(page));
}
static inline void *kmap_atomic(struct page *page)
{
preempt_disable();
pagefault_disable();
return page_address(page);
}
static inline void kunmap_atomic_high(void *addr)
#define ARCH_HAS_FLUSH_ON_KUNMAP
static inline void kunmap_flush_on_unmap(void *addr)
{
flush_kernel_dcache_page_addr(addr);
}
#define kmap_atomic_prot(page, prot) kmap_atomic(page)
#define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn))
#endif /* _PARISC_CACHEFLUSH_H */

10
include/linux/highmem.h
View File

@ -130,7 +130,6 @@ static inline struct page *kmap_to_page(void *addr)
static inline unsigned long totalhigh_pages(void) { return 0UL; }
#ifndef ARCH_HAS_KMAP
static inline void *kmap(struct page *page)
{
might_sleep();
@ -143,6 +142,9 @@ static inline void kunmap_high(struct page *page)
static inline void kunmap(struct page *page)
{
#ifdef ARCH_HAS_FLUSH_ON_KUNMAP
kunmap_flush_on_unmap(page_address(page));
#endif
}
static inline void *kmap_atomic(struct page *page)
@ -156,15 +158,17 @@ static inline void *kmap_atomic(struct page *page)
static inline void kunmap_atomic_high(void *addr)
{
/*
* Nothing to do in the CONFIG_HIGHMEM=n case as kunmap_atomic()
* Mostly nothing to do in the CONFIG_HIGHMEM=n case as kunmap_atomic()
* handles re-enabling faults + preemption
*/
#ifdef ARCH_HAS_FLUSH_ON_KUNMAP
kunmap_flush_on_unmap(addr);
#endif
}
#define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn))
#define kmap_flush_unused() do {} while(0)
#endif
#endif /* CONFIG_HIGHMEM */