[PATCH 3.13 015/187] sparc64: Fix executable bit testing in set_pmd_at() paths.

Kamal Mostafa
2014-09-15T22:10:44Z

From: "David S. Miller" <davem@davemloft.net>

[ Upstream commit 5b1e94fa439a3227beefad58c28c17f68287a8e9 ]

This code was mistakenly using the exec bit from the PMD in all
cases, even when the PMD isn't a huge PMD.

If it's not a huge PMD, test the exec bit in the individual ptes down
in tlb_batch_pmd_scan().

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
arch/sparc/mm/tlb.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/arch/sparc/mm/tlb.c b/arch/sparc/mm/tlb.c
index ad3bf4b..3999297 100644
--- a/arch/sparc/mm/tlb.c
+++ b/arch/sparc/mm/tlb.c
@@ -135,7 +135,7 @@ no_cache_flush:

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static void tlb_batch_pmd_scan(struct mm_struct *mm, unsigned long vaddr,
- pmd_t pmd, bool exec)
+ pmd_t pmd)
{
unsigned long end;
pte_t *pte;
@@ -143,8 +143,11 @@ static void tlb_batch_pmd_scan(struct mm_struct *mm, unsigned long vaddr,
pte = pte_offset_map(&pmd, vaddr);
end = vaddr + HPAGE_SIZE;
while (vaddr < end) {
- if (pte_val(*pte) & _PAGE_VALID)
+ if (pte_val(*pte) & _PAGE_VALID) {
+ bool exec = pte_exec(*pte);
+
tlb_batch_add_one(mm, vaddr, exec);
+ }
pte++;
vaddr += PAGE_SIZE;
}
@@ -178,15 +181,15 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr,
}

if (!pmd_none(orig)) {
- pte_t orig_pte = __pte(pmd_val(orig));
- bool exec = pte_exec(orig_pte);
-
addr &= HPAGE_MASK;
if (pmd_trans_huge(orig)) {
+ pte_t orig_pte = __pte(pmd_val(orig));
+ bool exec = pte_exec(orig_pte);
+
tlb_batch_add_one(mm, addr, exec);
tlb_batch_add_one(mm, addr + REAL_HPAGE_SIZE, exec);
} else {
- tlb_batch_pmd_scan(mm, addr, orig, exec);
+ tlb_batch_pmd_scan(mm, addr, orig);
}
}
}
--
1.9.1