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[PATCH] mm: k{,um}map_atomic() vs in_atomic()

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Make kmap_atomic/kunmap_atomic denote a pagefault disabled scope.  All non
trivial implementations already do this anyway.

Signed-off-by: Peter Zijlstra <[email protected]>
Acked-by: Nick Piggin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Peter Zijlstra 2006-12-06 20:32:21 -08:00 • committed by Linus Torvalds
commit ad76fb6b5a
2 changed files with 13 additions and 5 deletions
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10
include/asm-mips/highmem.h
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@ -21,6 +21,7 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/uaccess.h>
#include <asm/kmap_types.h>
/* undef for production */
@ -70,11 +71,16 @@ static inline void *kmap(struct page *page)
static inline void *kmap_atomic(struct page *page, enum km_type type)
{
pagefault_disable();
return page_address(page);
}
static inline void kunmap_atomic(void *kvaddr, enum km_type type) { }
#define kmap_atomic_pfn(pfn, idx) page_address(pfn_to_page(pfn))
static inline void kunmap_atomic(void *kvaddr, enum km_type type)
{
pagefault_enable();
}
#define kmap_atomic_pfn(pfn, idx) kmap_atomic(pfn_to_page(pfn), (idx))
#define kmap_atomic_to_page(ptr) virt_to_page(ptr)