diff options
| author | Rasmus Villemoes <linux@rasmusvillemoes.dk> | 2015-04-16 01:17:08 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-16 01:35:23 +0200 |
| commit | 3ea8d440a86b85c63c2bb7f73988626e682db5f0 (patch) | |
| tree | 8554f5f9a6dc1dc30601b88fa752993ff761d353 /lib | |
| parent | lib/vsprintf.c: reduce stack use in number() (diff) | |
| download | linux-3ea8d440a86b85c63c2bb7f73988626e682db5f0.tar.xz linux-3ea8d440a86b85c63c2bb7f73988626e682db5f0.zip | |
lib/vsprintf.c: eliminate duplicate hex string array
gcc doesn't merge or overlap const char[] objects with identical contents
(probably language lawyers would also insist that these things have
different addresses), but there's no reason to have the string
"0123456789ABCDEF" occur in multiple places. hex_asc_upper is declared in
kernel.h and defined in lib/hexdump.c, which is unconditionally compiled
in.
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')
| -rw-r--r-- | lib/vsprintf.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 98f1ce907d3d..7a299d43987a 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -383,9 +383,6 @@ static noinline_for_stack char *number(char *buf, char *end, unsigned long long num, struct printf_spec spec) { - /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ - static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ - char tmp[3 * sizeof(num)]; char sign; char locase; @@ -422,7 +419,7 @@ char *number(char *buf, char *end, unsigned long long num, /* generate full string in tmp[], in reverse order */ i = 0; if (num < spec.base) - tmp[i++] = digits[num] | locase; + tmp[i++] = hex_asc_upper[num] | locase; else if (spec.base != 10) { /* 8 or 16 */ int mask = spec.base - 1; int shift = 3; @@ -430,7 +427,7 @@ char *number(char *buf, char *end, unsigned long long num, if (spec.base == 16) shift = 4; do { - tmp[i++] = (digits[((unsigned char)num) & mask] | locase); + tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); num >>= shift; } while (num); } else { /* base 10 */ |