linux-kernel - [PATCH 1/3] lib: string_get_size: Remove redundant prefixes

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Date:	Fri, 12 Dec 2014 15:43:46 +0100
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] lib: string_get_size: Remove redundant prefixes

While 3c9f3681d0b4 says that Z and Y are included in preparation for
128 bit computers, they just waste .text currently. If and when we get
u128, string_get_size needs updating anyway (and ISO needs to come up
with four more prefixes).

Also there's no need to include and test for the NULL sentinel; once
we reach "E" size is at most 18. [The test is also wrong; it should be
units_str[units][i+1]; if we've reached NULL we're already doomed.]

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 lib/string_helpers.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index 58b78ba57439..0d25f7aa732c 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -28,11 +28,10 @@ int string_get_size(u64 size, const enum string_size_units units,
 		    char *buf, int len)
 {
 	static const char *const units_10[] = {
-		"B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB", NULL
+		"B", "kB", "MB", "GB", "TB", "PB", "EB"
 	};
 	static const char *const units_2[] = {
-		"B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB",
-		NULL
+		"B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"
 	};
 	static const char *const *const units_str[] = {
 		[STRING_UNITS_10] = units_10,
@@ -49,7 +48,7 @@ int string_get_size(u64 size, const enum string_size_units units,
 	tmp[0] = '\0';
 	i = 0;
 	if (size >= divisor[units]) {
-		while (size >= divisor[units] && units_str[units][i]) {
+		while (size >= divisor[units]) {
 			remainder = do_div(size, divisor[units]);
 			i++;
 		}
-- 
2.1.3

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