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parisc: Call pagefault_disable/pagefault_enable in kmap_atomic/kunmap_atomic 

Based on the generic implementation of kmap_atomic and kunmap_atomic,
we should call pagefault_disable and pagefault_enable in our PA8000
implementation.

The define for kmap_atomic_prot was also missing, and I updated
kmap_atomic_pfn to use the generic implementation because of the
change to kmap_atomic.

I believe that this change is needed to fix the fork copy-on-write
bug.

Signed-off-by: John David Anglin <dave.anglin@nrc-cnrc.gc.ca>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
John David Anglin 2010-04-11 16:36:14 +00:00 committed by Kyle McMartin
parent 9b437bca16
commit 210501aa57
1 changed files with 13 additions and 3 deletions
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16
arch/parisc/include/asm/cacheflush.h
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@ -2,6 +2,7 @@
#define _PARISC_CACHEFLUSH_H
#include <linux/mm.h>
#include <linux/uaccess.h>
/* The usual comment is "Caches aren't brain-dead on the <architecture>".
* Unfortunately, that doesn't apply to PA-RISC. */
@ -125,11 +126,20 @@ static inline void *kmap(struct page *page)
#define kunmap(page) kunmap_parisc(page_address(page))
#define kmap_atomic(page, idx) page_address(page)
static inline void *kmap_atomic(struct page *page, enum km_type idx)
{
pagefault_disable();
return page_address(page);
}
#define kunmap_atomic(addr, idx) kunmap_parisc(addr)
static inline void kunmap_atomic(void *addr, enum km_type idx)
{
kunmap_parisc(addr);
pagefault_enable();
}
#define kmap_atomic_pfn(pfn, idx) page_address(pfn_to_page(pfn))
#define kmap_atomic_prot(page, idx, prot) kmap_atomic(page, idx)
#define kmap_atomic_pfn(pfn, idx) kmap_atomic(pfn_to_page(pfn), (idx))
#define kmap_atomic_to_page(ptr) virt_to_page(ptr)
#endif