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authorDavid S. Miller <davem@davemloft.net>2014-04-24 13:58:02 -0700
committerDavid S. Miller <davem@davemloft.net>2014-05-03 22:31:52 -0700
commit51e5ef1bb7ab0e5fa7de4e802da5ab22fe35f0bf (patch)
treef8ef5fdc807082bf9d9f75577e764cec96ed13a4 /arch/sparc/mm
parent5b1e94fa439a3227beefad58c28c17f68287a8e9 (diff)
downloadlinux-51e5ef1bb7ab0e5fa7de4e802da5ab22fe35f0bf.tar.bz2
sparc64: Fix huge PMD invalidation.
On sparc64 "present" and "valid" are seperate PTE bits, this allows us to naturally distinguish between the user explicitly asking for PROT_NONE with mprotect() and other situations. However we weren't handling this properly in the huge PMD paths. First of all, the page table walker in the TSB miss path only checks for _PAGE_PMD_HUGE. So the generic pmdp_invalidate() would clear _PAGE_PRESENT but the TLB miss paths would still load it into the TLB as a valid huge PMD. Fix this by clearing the valid bit in pmdp_invalidate(), and also checking the valid bit in USER_PGTABLE_CHECK_PMD_HUGE using "brgez" since _PAGE_VALID is bit 63 in both the sun4u and sun4v pte layouts. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/mm')
-rw-r--r--arch/sparc/mm/tlb.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/sparc/mm/tlb.c b/arch/sparc/mm/tlb.c
index c07667fcd66e..b89aba217e3b 100644
--- a/arch/sparc/mm/tlb.c
+++ b/arch/sparc/mm/tlb.c
@@ -193,6 +193,17 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr,
}
}
+void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
+ pmd_t *pmdp)
+{
+ pmd_t entry = *pmdp;
+
+ pmd_val(entry) &= ~_PAGE_VALID;
+
+ set_pmd_at(vma->vm_mm, address, pmdp, entry);
+ flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
+}
+
void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
pgtable_t pgtable)
{