diff options
| author | David S. Miller <davem@sunset.sfo1.dsl.speakeasy.net> | 2006-06-02 00:47:25 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@sunset.sfo1.dsl.speakeasy.net> | 2006-06-02 00:47:25 (GMT) |
| commit | 0b0968a3e691771bf87e1ce747b2c7d23b5526c8 (patch) | |
| tree | 71787e376b7aef54b48e99d15a0fc11c7cf7ee8d /include/asm-sparc64/pgtable.h | |
| parent | 951bc82c53f30ec6b4c2d04a051e74ea9a89b669 (diff) | |
| download | linux-0b0968a3e691771bf87e1ce747b2c7d23b5526c8.tar.xz | |
[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-sparc64/pgtable.h')
| -rw-r--r-- | include/asm-sparc64/pgtable.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/asm-sparc64/pgtable.h b/include/asm-sparc64/pgtable.h index c44e746..cd464f4 100644 --- a/include/asm-sparc64/pgtable.h +++ b/include/asm-sparc64/pgtable.h @@ -689,6 +689,23 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *p #define pte_clear(mm,addr,ptep) \ set_pte_at((mm), (addr), (ptep), __pte(0UL)) +#ifdef DCACHE_ALIASING_POSSIBLE +#define __HAVE_ARCH_MOVE_PTE +#define move_pte(pte, prot, old_addr, new_addr) \ +({ \ + pte_t newpte = (pte); \ + if (tlb_type != hypervisor && pte_present(pte)) { \ + unsigned long this_pfn = pte_pfn(pte); \ + \ + if (pfn_valid(this_pfn) && \ + (((old_addr) ^ (new_addr)) & (1 << 13))) \ + flush_dcache_page_all(current->mm, \ + pfn_to_page(this_pfn)); \ + } \ + newpte; \ +}) +#endif + extern pgd_t swapper_pg_dir[2048]; extern pmd_t swapper_low_pmd_dir[2048]; |