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authorDavid S. Miller <davem@sunset.sfo1.dsl.speakeasy.net>2006-06-01 17:47:25 -0700
committerDavid S. Miller <davem@sunset.sfo1.dsl.speakeasy.net>2006-06-01 17:47:25 -0700
commit0b0968a3e691771bf87e1ce747b2c7d23b5526c8 (patch)
tree71787e376b7aef54b48e99d15a0fc11c7cf7ee8d /include/asm-generic/pgtable.h
parent951bc82c53f30ec6b4c2d04a051e74ea9a89b669 (diff)
downloadlinux-stericsson-0b0968a3e691771bf87e1ce747b2c7d23b5526c8.tar.gz
[SPARC64]: Fix D-cache corruption in mremap
If we move a mapping from one virtual address to another, and this changes the virtual color of the mapping to those pages, we can see corrupt data due to D-cache aliasing. Check for and deal with this by overriding the move_pte() macro. Set things up so that other platforms can cleanly override the move_pte() macro too. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/asm-generic/pgtable.h')
-rw-r--r--include/asm-generic/pgtable.h11
1 files changed, 1 insertions, 10 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 358e4d309ceb..c2059a3a0621 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -159,17 +159,8 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addres
#define lazy_mmu_prot_update(pte) do { } while (0)
#endif
-#ifndef __HAVE_ARCH_MULTIPLE_ZERO_PAGE
+#ifndef __HAVE_ARCH_MOVE_PTE
#define move_pte(pte, prot, old_addr, new_addr) (pte)
-#else
-#define move_pte(pte, prot, old_addr, new_addr) \
-({ \
- pte_t newpte = (pte); \
- if (pte_present(pte) && pfn_valid(pte_pfn(pte)) && \
- pte_page(pte) == ZERO_PAGE(old_addr)) \
- newpte = mk_pte(ZERO_PAGE(new_addr), (prot)); \
- newpte; \
-})
#endif
/*