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| author | Richard Weinberger <richard@nod.at> | 2012-04-14 17:46:01 +0200 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-05-31 00:43:47 +0100 |
| commit | ff741084d380bd234a4d0ffba0c19e8047a14658 (patch) | |
| tree | cb667056545baa8d76f514d0f2fa17930a69fed2 /arch/um | |
| parent | e22b65022898e212f80ca989e613179e318b8a79 (diff) | |
| download | lwn-ff741084d380bd234a4d0ffba0c19e8047a14658.tar.gz lwn-ff741084d380bd234a4d0ffba0c19e8047a14658.zip | |
um: Fix __swp_type()
commit 2b76ebaa728f8a3967c52aa189261c72fe56a6f1 upstream.
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.
Analyzed-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'arch/um')
| -rw-r--r-- | arch/um/include/asm/pgtable.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h index 0fea0ec96228..aa365c55ecf9 100644 --- a/arch/um/include/asm/pgtable.h +++ b/arch/um/include/asm/pgtable.h @@ -352,11 +352,11 @@ 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 }) |