The patch titled
Subject: lib/lz4: make arrays static const, reduces object code size
has been added to the -mm tree. Its filename is
lib-lz4-make-arrays-static-const-reduces-object-code-size.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/lib-lz4-make-arrays-static-const-reduces-object-code-size.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/lib-lz4-make-arrays-static-const-reduces-object-code-size.patch
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------------------------------------------------------
From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Subject: lib/lz4: make arrays static const, reduces object code size
Don't populate the read-only arrays dec32table and dec64table on the
stack, instead make them both static const. Makes the object code smaller
by over 10K bytes:
Before:
text data bss dec hex filename
31500 0 0 31500 7b0c lib/lz4/lz4_decompress.o
After:
text data bss dec hex filename
20237 176 0 20413 4fbd lib/lz4/lz4_decompress.o
(gcc version 7.2.0 x86_64)
Link: http://lkml.kernel.org/r/20170921221939.20820-1-colin.king@xxxxxxxxxxxxx
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Cc: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Cc: Sven Schmidt <4sschmid@xxxxxxxxxxxxxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/lz4/lz4_decompress.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN lib/lz4/lz4_decompress.c~lib-lz4-make-arrays-static-const-reduces-object-code-size lib/lz4/lz4_decompress.c
--- a/lib/lz4/lz4_decompress.c~lib-lz4-make-arrays-static-const-reduces-object-code-size
+++ a/lib/lz4/lz4_decompress.c
@@ -85,8 +85,8 @@ static FORCE_INLINE int LZ4_decompress_g
const BYTE * const lowLimit = lowPrefix - dictSize;
const BYTE * const dictEnd = (const BYTE *)dictStart + dictSize;
- const unsigned int dec32table[] = { 0, 1, 2, 1, 4, 4, 4, 4 };
- const int dec64table[] = { 0, 0, 0, -1, 0, 1, 2, 3 };
+ static const unsigned int dec32table[] = { 0, 1, 2, 1, 4, 4, 4, 4 };
+ static const int dec64table[] = { 0, 0, 0, -1, 0, 1, 2, 3 };
const int safeDecode = (endOnInput == endOnInputSize);
const int checkOffset = ((safeDecode) && (dictSize < (int)(64 * KB)));
_
Patches currently in -mm which might be from colin.king@xxxxxxxxxxxxx are
lib-lz4-make-arrays-static-const-reduces-object-code-size.patch
kernel-watchdog-fix-spelling-mistake-permanetely-permanently.patch
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