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authorRichard Weinberger <richard@nod.at>2012-04-14 17:46:01 +0200
committerRichard Weinberger <richard@nod.at>2012-05-21 21:09:35 +0200
commit2b76ebaa728f8a3967c52aa189261c72fe56a6f1 (patch)
treeed106b9b9f1f0650792b602f9f47571406ee6ebd /arch/um
parentf15b9000eb1d09bbaa4b0a6b2089d7e1f64e84b3 (diff)
downloadlinux-2b76ebaa728f8a3967c52aa189261c72fe56a6f1.tar.bz2
um: Fix __swp_type()
The current __swp_type() function uses a too small bitshift. Using more than one swap files causes bad pages because the type bits clash with other page flags. CC: stable@kernel.org Analyzed-by: Hugh Dickins <hughd@google.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/include/asm/pgtable.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h
index 294254e13a35..5888f1b83477 100644
--- a/arch/um/include/asm/pgtable.h
+++ b/arch/um/include/asm/pgtable.h
@@ -354,11 +354,11 @@ extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
#define update_mmu_cache(vma,address,ptep) do ; while (0)
/* Encode and de-code a swap entry */
-#define __swp_type(x) (((x).val >> 4) & 0x3f)
+#define __swp_type(x) (((x).val >> 5) & 0x1f)
#define __swp_offset(x) ((x).val >> 11)
#define __swp_entry(type, offset) \
- ((swp_entry_t) { ((type) << 4) | ((offset) << 11) })
+ ((swp_entry_t) { ((type) << 5) | ((offset) << 11) })
#define __pte_to_swp_entry(pte) \
((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })