[ARM] Fix shared mmap when more than two maps of the same file exist

The shared mmap code works fine for the test case, which only checked
for two shared maps of the same file.  However, three shared maps
result in one mapping remaining cached, resulting in stale data being
visible via that mapping.  Fix this.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/mm/fault-armv.c b/arch/arm/mm/fault-armv.c
index fbfa26058442ccf5fb8dc0225b306f404eea2b6e..a8ec97b4752e129afcecbded471388af85d6ccb8 100644 (file)
--- a/arch/arm/mm/fault-armv.c
+++ b/arch/arm/mm/fault-armv.c
@@ -37,7 +37,7 @@ static int adjust_pte(struct vm_area_struct *vma, unsigned long address)
        pgd_t *pgd;
        pmd_t *pmd;
        pte_t *pte, entry;
-       int ret = 0;
+       int ret;
 
        pgd = pgd_offset(vma->vm_mm, address);
        if (pgd_none(*pgd))
@@ -54,16 +54,20 @@ static int adjust_pte(struct vm_area_struct *vma, unsigned long address)
        pte = pte_offset_map(pmd, address);
        entry = *pte;
 
+       /*
+        * If this page is present, it's actually being shared.
+        */
+       ret = pte_present(entry);
+
        /*
         * If this page isn't present, or is already setup to
         * fault (ie, is old), we can safely ignore any issues.
         */
-       if (pte_present(entry) && pte_val(entry) & shared_pte_mask) {
+       if (ret && pte_val(entry) & shared_pte_mask) {
                flush_cache_page(vma, address, pte_pfn(entry));
                pte_val(entry) &= ~shared_pte_mask;
                set_pte_at(vma->vm_mm, address, pte, entry);
                flush_tlb_page(vma, address);
-               ret = 1;
        }
        pte_unmap(pte);
        return ret;