From: Rasmus Villemoes Date: Tue, 30 Oct 2018 22:05:18 +0000 (-0700) Subject: lib/bitmap.c: simplify bitmap_print_to_pagebuf() X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=8ec3d76863d8bb317f330bbe4bf35cded8d85f01;p=people%2Fjulieng%2Flinux-arm.git lib/bitmap.c: simplify bitmap_print_to_pagebuf() len is guaranteed to lie in [1, PAGE_SIZE]. If scnprintf is called with a buffer size of 1, it is guaranteed to return 0. So in the extremely unlikely case of having just one byte remaining in the page, let's just call scnprintf anyway. The only difference is that this will write a '\0' to that final byte in the page, but that's an improvement: We now guarantee that after the call, buf is a properly terminated C string of length exactly the return value. Link: http://lkml.kernel.org/r/20180818131623.8755-8-linux@rasmusvillemoes.dk Signed-off-by: Rasmus Villemoes Reviewed-by: Andy Shevchenko Cc: Yury Norov Cc: Rasmus Villemoes Cc: Sudeep Holla Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/lib/bitmap.c b/lib/bitmap.c index 5ade00d4219a..eead55aa7170 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -471,12 +471,9 @@ int bitmap_print_to_pagebuf(bool list, char *buf, const unsigned long *maskp, int nmaskbits) { ptrdiff_t len = PAGE_SIZE - offset_in_page(buf); - int n = 0; - if (len > 1) - n = list ? scnprintf(buf, len, "%*pbl\n", nmaskbits, maskp) : - scnprintf(buf, len, "%*pb\n", nmaskbits, maskp); - return n; + return list ? scnprintf(buf, len, "%*pbl\n", nmaskbits, maskp) : + scnprintf(buf, len, "%*pb\n", nmaskbits, maskp); } EXPORT_SYMBOL(bitmap_print_to_pagebuf);