From: Rasmus Villemoes Date: Thu, 12 Feb 2015 23:01:48 +0000 (-0800) Subject: lib/string_helpers.c:string_get_size(): use 32 bit arithmetic when possible X-Git-Tag: firefly_0821_release~176^2~2336^2~34 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=84b9fbedf54a6ea4fba62ef8a167138233586ad3;p=firefly-linux-kernel-4.4.55.git lib/string_helpers.c:string_get_size(): use 32 bit arithmetic when possible The remainder from do_div is always a u32, and after size has been reduced to be below 1000 (or 1024), it certainly fits in u32. So both remainder and sf_cap can be made u32s, the format specifiers can be simplified (%lld wasn't the right thing to use for _unsigned_ long long anyway), and we can replace a do_div with an ordinary 32/32 bit division. Signed-off-by: Rasmus Villemoes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/lib/string_helpers.c b/lib/string_helpers.c index 0d25f7aa732c..2b3757f84b3b 100644 --- a/lib/string_helpers.c +++ b/lib/string_helpers.c @@ -42,7 +42,7 @@ int string_get_size(u64 size, const enum string_size_units units, [STRING_UNITS_2] = 1024, }; int i, j; - u64 remainder = 0, sf_cap; + u32 remainder = 0, sf_cap; char tmp[8]; tmp[0] = '\0'; @@ -59,14 +59,13 @@ int string_get_size(u64 size, const enum string_size_units units, if (j) { remainder *= 1000; - do_div(remainder, divisor[units]); - snprintf(tmp, sizeof(tmp), ".%03lld", - (unsigned long long)remainder); + remainder /= divisor[units]; + snprintf(tmp, sizeof(tmp), ".%03u", remainder); tmp[j+1] = '\0'; } } - snprintf(buf, len, "%lld%s %s", (unsigned long long)size, + snprintf(buf, len, "%u%s %s", (u32)size, tmp, units_str[units][i]); return 0;