From: Rasmus Villemoes Date: Wed, 15 Apr 2015 23:17:08 +0000 (-0700) Subject: lib/vsprintf.c: eliminate duplicate hex string array X-Git-Tag: firefly_0821_release~176^2~1961^2~28 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3ea8d440a86b85c63c2bb7f73988626e682db5f0;p=firefly-linux-kernel-4.4.55.git 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 Cc: Peter Zijlstra Cc: Tejun Heo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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 */