[PATCH] mm: pagefault_{disable,enable}()

Introduce pagefault_{disable,enable}() and use these where previously we did
manual preempt increments/decrements to make the pagefault handler do the
atomic thing.

Currently they still rely on the increased preempt count, but do not rely on
the disabled preemption, this might go away in the future.

(NOTE: the extra barrier() in pagefault_disable might fix some holes on
       machines which have too many registers for their own good)

[heiko.carstens@de.ibm.com: s390 fix]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Nick Piggin <npiggin@suse.de>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 5 deletions

diff --git a/arch/sparc/mm/highmem.c b/arch/sparc/mm/highmem.c
index 4d8ed9c65182..01fc6c254292 100644
--- a/arch/sparc/mm/highmem.c
+++ b/arch/sparc/mm/highmem.c
@@ -35,7 +35,7 @@ void *kmap_atomic(struct page *page, enum km_type type)
         unsigned long vaddr;
 
         /* even !CONFIG_PREEMPT needs this, for in_atomic in do_page_fault */
-        inc_preempt_count();
+        pagefault_disable();
         if (!PageHighMem(page))
                 return page_address(page);
 
@@ -70,8 +70,7 @@ void kunmap_atomic(void *kvaddr, enum km_type type)
         unsigned long idx = type + KM_TYPE_NR*smp_processor_id();
 
         if (vaddr < FIXADDR_START) { // FIXME
-                dec_preempt_count();
-                preempt_check_resched();
+                pagefault_enable();
                 return;
         }
 
@@ -97,8 +96,7 @@ void kunmap_atomic(void *kvaddr, enum km_type type)
 #endif
 #endif
 
-        dec_preempt_count();
-        preempt_check_resched();
+        pagefault_enable();
 }
 
 /* We may be fed a pagetable here by ptep_to_xxx and others. */