This is a note to let you know that I've just added the patch titled
word-at-a-time.h: support zero_bytemask() on alpha and tile
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
word-at-a-time.h-support-zero_bytemask-on-alpha-and-tile.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c753bf34c94e5ac901e625e52f47320eeec4de2d Mon Sep 17 00:00:00 2001
From: Chris Metcalf <cmetcalf@xxxxxxxxxx>
Date: Tue, 6 Oct 2015 14:20:45 -0400
Subject: word-at-a-time.h: support zero_bytemask() on alpha and tile
From: Chris Metcalf <cmetcalf@xxxxxxxxxx>
commit c753bf34c94e5ac901e625e52f47320eeec4de2d upstream.
Both alpha and tile needed implementations of zero_bytemask.
The alpha version is untested.
Signed-off-by: Chris Metcalf <cmetcalf@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/alpha/include/asm/word-at-a-time.h | 2 ++
arch/tile/include/asm/word-at-a-time.h | 8 +++++++-
2 files changed, 9 insertions(+), 1 deletion(-)
--- a/arch/alpha/include/asm/word-at-a-time.h
+++ b/arch/alpha/include/asm/word-at-a-time.h
@@ -52,4 +52,6 @@ static inline unsigned long find_zero(un
#endif
}
+#define zero_bytemask(mask) ((2ul << (find_zero(mask) * 8)) - 1)
+
#endif /* _ASM_WORD_AT_A_TIME_H */
--- a/arch/tile/include/asm/word-at-a-time.h
+++ b/arch/tile/include/asm/word-at-a-time.h
@@ -6,7 +6,7 @@
struct word_at_a_time { /* unused */ };
#define WORD_AT_A_TIME_CONSTANTS {}
-/* Generate 0x01 byte values for non-zero bytes using a SIMD instruction. */
+/* Generate 0x01 byte values for zero bytes using a SIMD instruction. */
static inline unsigned long has_zero(unsigned long val, unsigned long *data,
const struct word_at_a_time *c)
{
@@ -33,4 +33,10 @@ static inline long find_zero(unsigned lo
#endif
}
+#ifdef __BIG_ENDIAN
+#define zero_bytemask(mask) (~1ul << (63 - __builtin_clzl(mask)))
+#else
+#define zero_bytemask(mask) ((2ul << __builtin_ctzl(mask)) - 1)
+#endif
+
#endif /* _ASM_WORD_AT_A_TIME_H */
Patches currently in stable-queue which might be from cmetcalf@xxxxxxxxxx are
queue-3.18/strscpy-zero-any-trailing-garbage-bytes-in-the-destination.patch
queue-3.18/word-at-a-time.h-support-zero_bytemask-on-alpha-and-tile.patch
queue-3.18/tile-add-asm-word-at-a-time.h-and-enable-support-functions.patch
queue-3.18/string-provide-strscpy.patch