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authorRasmus Villemoes <linux@rasmusvillemoes.dk>2018-10-30 15:05:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-10-31 08:54:12 -0700
commit8ec3d76863d8bb317f330bbe4bf35cded8d85f01 (patch)
treecd12cbe92cf5b52b581b96c6380d465023f918f7 /lib
parentce1091d471107dbf6f91db66a480a25950c9b9ff (diff)
downloadlinux-8ec3d76863d8bb317f330bbe4bf35cded8d85f01.tar.gz
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 <linux@rasmusvillemoes.dk> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Yury Norov <ynorov@caviumnetworks.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Sudeep Holla <sudeep.holla@arm.com> 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/bitmap.c7
1 files changed, 2 insertions, 5 deletions
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);