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linux-sg2042
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Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6:
  [IA64] Fix race in the accessed/dirty bit handlers
This commit is contained in:
Linus Torvalds 2006-03-10 16:39:03 -08:00
parent 44f329ab69 d8117ce5a6
commit 35ab0e88c6
1 changed files with 9 additions and 6 deletions
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15
arch/ia64/kernel/ivt.S
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@ -561,11 +561,12 @@ ENTRY(dirty_bit)
;; // avoid RAW on r18
mov ar.ccv=r18 // set compare value for cmpxchg
or r25=_PAGE_D|_PAGE_A,r18 // set the dirty and accessed bits
tbit.z p7,p6 = r18,_PAGE_P_BIT // Check present bit
;;
cmpxchg8.acq r26=[r17],r25,ar.ccv
(p6) cmpxchg8.acq r26=[r17],r25,ar.ccv // Only update if page is present
mov r24=PAGE_SHIFT<<2
;;
cmp.eq p6,p7=r26,r18
(p6) cmp.eq p6,p7=r26,r18 // Only compare if page is present
;;
(p6) itc.d r25 // install updated PTE
;;
@ -626,11 +627,12 @@ ENTRY(iaccess_bit)
;;
mov ar.ccv=r18 // set compare value for cmpxchg
or r25=_PAGE_A,r18 // set the accessed bit
tbit.z p7,p6 = r18,_PAGE_P_BIT // Check present bit
;;
cmpxchg8.acq r26=[r17],r25,ar.ccv
(p6) cmpxchg8.acq r26=[r17],r25,ar.ccv // Only if page present
mov r24=PAGE_SHIFT<<2
;;
cmp.eq p6,p7=r26,r18
(p6) cmp.eq p6,p7=r26,r18 // Only if page present
;;
(p6) itc.i r25 // install updated PTE
;;
@ -680,11 +682,12 @@ ENTRY(daccess_bit)
;; // avoid RAW on r18
mov ar.ccv=r18 // set compare value for cmpxchg
or r25=_PAGE_A,r18 // set the dirty bit
tbit.z p7,p6 = r18,_PAGE_P_BIT // Check present bit
;;
cmpxchg8.acq r26=[r17],r25,ar.ccv
(p6) cmpxchg8.acq r26=[r17],r25,ar.ccv // Only if page is present
mov r24=PAGE_SHIFT<<2
;;
cmp.eq p6,p7=r26,r18
(p6) cmp.eq p6,p7=r26,r18 // Only if page is present
;;
(p6) itc.d r25 // install updated PTE
/*