The patch titled Subject: string: introduce memweight() has been added to the -mm tree. Its filename is string-introduce-memweight.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Akinobu Mita <akinobu.mita@xxxxxxxxx> Subject: string: introduce memweight() memweight() is the function that counts the total number of bits set in memory area. Unlike bitmap_weight(), memweight() takes pointer and size in bytes to specify a memory area which does not need to be aligned to long-word boundary. Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx> Cc: Anders Larsen <al@xxxxxxxxxxx> Cc: Alasdair Kergon <agk@xxxxxxxxxx> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> Cc: Mark Fasheh <mfasheh@xxxxxxxx> Cc: Joel Becker <jlbec@xxxxxxxxxxxx> Cc: Jan Kara <jack@xxxxxxx> Cc: Andreas Dilger <adilger.kernel@xxxxxxxxx> Cc: "Theodore Ts'o" <tytso@xxxxxxx> Cc: Matthew Wilcox <matthew@xxxxxx> Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/string.h | 3 +++ lib/string.c | 36 ++++++++++++++++++++++++++++++++++++ 2 files changed, 39 insertions(+) diff -puN include/linux/string.h~string-introduce-memweight include/linux/string.h --- a/include/linux/string.h~string-introduce-memweight +++ a/include/linux/string.h @@ -145,4 +145,7 @@ static inline bool strstarts(const char return strncmp(str, prefix, strlen(prefix)) == 0; } #endif + +extern size_t memweight(const void *ptr, size_t bytes); + #endif /* _LINUX_STRING_H_ */ diff -puN lib/string.c~string-introduce-memweight lib/string.c --- a/lib/string.c~string-introduce-memweight +++ a/lib/string.c @@ -26,6 +26,7 @@ #include <linux/export.h> #include <linux/bug.h> #include <linux/errno.h> +#include <linux/bitmap.h> #ifndef __HAVE_ARCH_STRNICMP /** @@ -824,3 +825,38 @@ void *memchr_inv(const void *start, int return check_bytes8(start, value, bytes % 8); } EXPORT_SYMBOL(memchr_inv); + +/** + * memweight - count the total number of bits set in memory area + * @ptr: pointer to the start of the area + * @bytes: the size of the area + */ +size_t memweight(const void *ptr, size_t bytes) +{ + size_t w = 0; + size_t longs; + const unsigned char *bitmap = ptr; + + for (; bytes > 0 && ((unsigned long)bitmap) % sizeof(long); + bytes--, bitmap++) + w += hweight8(*bitmap); + + longs = bytes / sizeof(long); + if (longs) { + BUG_ON(longs >= INT_MAX / BITS_PER_LONG); + w += bitmap_weight((unsigned long *)bitmap, + longs * BITS_PER_LONG); + bytes -= longs * sizeof(long); + bitmap += longs * sizeof(long); + } + /* + * The reason that this last loop is distinct from the preceding + * bitmap_weight() call is to compute 1-bits in the last region smaller + * than sizeof(long) properly on big-endian systems. + */ + for (; bytes > 0; bytes--, bitmap++) + w += hweight8(*bitmap); + + return w; +} +EXPORT_SYMBOL(memweight); _ Subject: Subject: string: introduce memweight() Patches currently in -mm which might be from akinobu.mita@xxxxxxxxx are linux-next.patch ocfs2-use-find_last_bit.patch ocfs2-use-bitmap_weight.patch string-introduce-memweight.patch string-introduce-memweight-fix.patch qnx4fs-use-memweight.patch dm-use-memweight.patch affs-use-memweight.patch video-uvc-use-memweight.patch ocfs2-use-memweight.patch ext2-use-memweight.patch ext3-use-memweight.patch ext4-use-memweight.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html