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authorRasmus Villemoes <linux@rasmusvillemoes.dk>2015-04-15 16:17:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-15 16:35:23 -0700
commitd1c1b12137fff14363d0cf45c8b7a9ec5cd4578b (patch)
treeafceb4ce1759b401af72ee5110a683974c4cfbb6 /lib/vsprintf.c
parent3ea8d440a86b85c63c2bb7f73988626e682db5f0 (diff)
lib/vsprintf.c: another small hack
Making ZEROPAD == '0'-' ', we can eliminate a few more instructions. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/vsprintf.c')
-rw-r--r--lib/vsprintf.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 7a299d43987a..2753f9261115 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -341,10 +341,10 @@ int num_to_str(char *buf, int size, unsigned long long num)
}
#define SIGN 1 /* unsigned/signed, must be 1 */
-#define ZEROPAD 2 /* pad with zero */
+#define LEFT 2 /* left justified */
#define PLUS 4 /* show plus */
#define SPACE 8 /* space if plus */
-#define LEFT 16 /* left justified */
+#define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */
#define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
#define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
@@ -467,7 +467,8 @@ char *number(char *buf, char *end, unsigned long long num,
}
/* zero or space padding */
if (!(spec.flags & LEFT)) {
- char c = (spec.flags & ZEROPAD) ? '0' : ' ';
+ char c = ' ' + (spec.flags & ZEROPAD);
+ BUILD_BUG_ON(' ' + ZEROPAD != '0');
while (--spec.field_width >= 0) {
if (buf < end)
*buf = c;