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authorDavid S. Miller <davem@davemloft.net>2014-04-25 00:58:02 +0400
committerDavid S. Miller <davem@davemloft.net>2014-05-04 09:31:52 +0400
commit51e5ef1bb7ab0e5fa7de4e802da5ab22fe35f0bf (patch)
treef8ef5fdc807082bf9d9f75577e764cec96ed13a4 /arch/sparc/include/asm/tsb.h
parent5b1e94fa439a3227beefad58c28c17f68287a8e9 (diff)
downloadlinux-51e5ef1bb7ab0e5fa7de4e802da5ab22fe35f0bf.tar.xz
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/include/asm/tsb.h')
-rw-r--r--arch/sparc/include/asm/tsb.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/sparc/include/asm/tsb.h b/arch/sparc/include/asm/tsb.h
index 2230f80d9fe3..90916f955cac 100644
--- a/arch/sparc/include/asm/tsb.h
+++ b/arch/sparc/include/asm/tsb.h
@@ -171,7 +171,8 @@ extern struct tsb_phys_patch_entry __tsb_phys_patch, __tsb_phys_patch_end;
andcc REG1, REG2, %g0; \
be,pt %xcc, 700f; \
sethi %hi(4 * 1024 * 1024), REG2; \
- andn REG1, REG2, REG1; \
+ brgez,pn REG1, FAIL_LABEL; \
+ andn REG1, REG2, REG1; \
and VADDR, REG2, REG2; \
brlz,pt REG1, PTE_LABEL; \
or REG1, REG2, REG1; \