The patch titled
Subject: include/linux/bitmap.h: add comment on BITMAP_LAST_WORD_MASK
has been added to the -mm tree. Its filename is
linux-bitmaph-comments-on-bitmap_last_word_mask.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/linux-bitmaph-comments-on-bitmap_last_word_mask.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/linux-bitmaph-comments-on-bitmap_last_word_mask.patch
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------------------------------------------------------
From: Wei Wang <wei.w.wang@xxxxxxxxx>
Subject: include/linux/bitmap.h: add comment on BITMAP_LAST_WORD_MASK
When "nbits = 0" which means no bits to mask, this macro is expected to
return 0, instead of 0xffffffff. Currently, the "nbits = 0" case is
avoided by the callers themselves (e.g.__bitmap_intersects,
__bitmap_weight). This corner case should be explicitly noted.
Add a comment above the macro as a note to users about the corner case.
Link: http://lkml.kernel.org/r/1532678611-9136-1-git-send-email-wei.w.wang@xxxxxxxxx
Signed-off-by: Wei Wang <wei.w.wang@xxxxxxxxx>
Cc: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Cc: Yury Norov <ynorov@xxxxxxxxxxxxxxxxxx>
Cc: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
diff -puN include/linux/bitmap.h~linux-bitmaph-comments-on-bitmap_last_word_mask include/linux/bitmap.h
--- a/include/linux/bitmap.h~linux-bitmaph-comments-on-bitmap_last_word_mask
+++ a/include/linux/bitmap.h
@@ -194,6 +194,7 @@ extern int bitmap_print_to_pagebuf(bool
const unsigned long *maskp, int nmaskbits);
#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
+/* "nbits = 0" is not applicable to this macro. Callers should avoid that. */
#define BITMAP_LAST_WORD_MASK(nbits) (~0UL >> (-(nbits) & (BITS_PER_LONG - 1)))
#define small_const_nbits(nbits) \
_
Patches currently in -mm which might be from wei.w.wang@xxxxxxxxx are
linux-bitmaph-comments-on-bitmap_last_word_mask.patch
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