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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2007-06-16 21:16:12 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-17 00:16:16 +0400
commit8dab5241d06bfc9ee141ea78c56cde5070d7460d (patch)
treedd9dc3c64c17862b169f4cbe5fd4a108d960c920 /include/asm-sparc
parent679ce0ace6b1a07043bc3b405a34ddccad808886 (diff)
downloadlinux-8dab5241d06bfc9ee141ea78c56cde5070d7460d.tar.xz
Rework ptep_set_access_flags and fix sun4c
Some changes done a while ago to avoid pounding on ptep_set_access_flags and update_mmu_cache in some race situations break sun4c which requires update_mmu_cache() to always be called on minor faults. This patch reworks ptep_set_access_flags() semantics, implementations and callers so that it's now responsible for returning whether an update is necessary or not (basically whether the PTE actually changed). This allow fixing the sparc implementation to always return 1 on sun4c. [akpm@linux-foundation.org: fixes, cleanups] Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Hugh Dickins <hugh@veritas.com> Cc: David Miller <davem@davemloft.net> Cc: Mark Fortescue <mark@mtfhpc.demon.co.uk> Acked-by: William Lee Irwin III <wli@holomorphy.com> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-sparc')
-rw-r--r--include/asm-sparc/pgtable.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/asm-sparc/pgtable.h b/include/asm-sparc/pgtable.h
index 4f0a5ba0d6a0..59229aeba27b 100644
--- a/include/asm-sparc/pgtable.h
+++ b/include/asm-sparc/pgtable.h
@@ -446,6 +446,17 @@ extern int io_remap_pfn_range(struct vm_area_struct *vma,
#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
#define GET_PFN(pfn) (pfn & 0x0fffffffUL)
+#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
+#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
+({ \
+ int __changed = !pte_same(*(__ptep), __entry); \
+ if (__changed) { \
+ set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
+ flush_tlb_page(__vma, __address); \
+ } \
+ (sparc_cpu_model == sun4c) || __changed; \
+})
+
#include <asm-generic/pgtable.h>
#endif /* !(__ASSEMBLY__) */