The patch titled
Subject: string: introduce memweight()
has been added to the -mm tree. Its filename is
string-introduce-memweight.patch
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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
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