From c4af96449e20f9245cf3d904098db508cdebcda8 Mon Sep 17 00:00:00 2001 From: Akinobu Mita Date: Mon, 15 Mar 2010 00:35:00 -0400 Subject: [PATCH] ntfs: use bitmap_weight Use bitmap_weight() instead of doing hweight32() for each u32 element in the page. Signed-off-by: Akinobu Mita Cc: Anton Altaparmakov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ntfs/super.c | 25 +++++++++++++------------ 1 file changed, 13 insertions(+), 12 deletions(-) diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c index 1cf39dfaee7a..0de1db6cddbf 100644 --- a/fs/ntfs/super.c +++ b/fs/ntfs/super.c @@ -31,6 +31,7 @@ #include #include #include +#include #include "sysctl.h" #include "logfile.h" @@ -2458,7 +2459,6 @@ static void ntfs_put_super(struct super_block *sb) static s64 get_nr_free_clusters(ntfs_volume *vol) { s64 nr_free = vol->nr_clusters; - u32 *kaddr; struct address_space *mapping = vol->lcnbmp_ino->i_mapping; struct page *page; pgoff_t index, max_index; @@ -2477,7 +2477,8 @@ static s64 get_nr_free_clusters(ntfs_volume *vol) ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%lx.", max_index, PAGE_CACHE_SIZE / 4); for (index = 0; index < max_index; index++) { - unsigned int i; + unsigned long *kaddr; + /* * Read the page from page cache, getting it from backing store * if necessary, and increment the use count. @@ -2490,16 +2491,16 @@ static s64 get_nr_free_clusters(ntfs_volume *vol) nr_free -= PAGE_CACHE_SIZE * 8; continue; } - kaddr = (u32*)kmap_atomic(page, KM_USER0); + kaddr = kmap_atomic(page, KM_USER0); /* - * For each 4 bytes, subtract the number of set bits. If this + * Subtract the number of set bits. If this * is the last page and it is partial we don't really care as * it just means we do a little extra work but it won't affect * the result as all out of range bytes are set to zero by * ntfs_readpage(). */ - for (i = 0; i < PAGE_CACHE_SIZE / 4; i++) - nr_free -= (s64)hweight32(kaddr[i]); + nr_free -= bitmap_weight(kaddr, + PAGE_CACHE_SIZE * BITS_PER_BYTE); kunmap_atomic(kaddr, KM_USER0); page_cache_release(page); } @@ -2538,7 +2539,6 @@ static s64 get_nr_free_clusters(ntfs_volume *vol) static unsigned long __get_nr_free_mft_records(ntfs_volume *vol, s64 nr_free, const pgoff_t max_index) { - u32 *kaddr; struct address_space *mapping = vol->mftbmp_ino->i_mapping; struct page *page; pgoff_t index; @@ -2548,7 +2548,8 @@ static unsigned long __get_nr_free_mft_records(ntfs_volume *vol, ntfs_debug("Reading $MFT/$BITMAP, max_index = 0x%lx, max_size = " "0x%lx.", max_index, PAGE_CACHE_SIZE / 4); for (index = 0; index < max_index; index++) { - unsigned int i; + unsigned long *kaddr; + /* * Read the page from page cache, getting it from backing store * if necessary, and increment the use count. @@ -2561,16 +2562,16 @@ static unsigned long __get_nr_free_mft_records(ntfs_volume *vol, nr_free -= PAGE_CACHE_SIZE * 8; continue; } - kaddr = (u32*)kmap_atomic(page, KM_USER0); + kaddr = kmap_atomic(page, KM_USER0); /* - * For each 4 bytes, subtract the number of set bits. If this + * Subtract the number of set bits. If this * is the last page and it is partial we don't really care as * it just means we do a little extra work but it won't affect * the result as all out of range bytes are set to zero by * ntfs_readpage(). */ - for (i = 0; i < PAGE_CACHE_SIZE / 4; i++) - nr_free -= (s64)hweight32(kaddr[i]); + nr_free -= bitmap_weight(kaddr, + PAGE_CACHE_SIZE * BITS_PER_BYTE); kunmap_atomic(kaddr, KM_USER0); page_cache_release(page); } -- 2.20.1