diff options
author | Fengguang Wu <fengguang.wu@gmail.com> | 2007-10-17 08:26:25 +0200 |
---|---|---|
committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 17:42:48 +0200 |
commit | e57aa839cea13852e07ecb495692b602b11136c9 (patch) | |
tree | 5296984f012e1483519f87af55c617fcbf186073 | |
parent | time: simplify smp_call_function_single() call sequence (diff) | |
download | linux-e57aa839cea13852e07ecb495692b602b11136c9.tar.xz linux-e57aa839cea13852e07ecb495692b602b11136c9.zip |
convert ill defined log2() to ilog2()
It's *wrong* to have
#define log2(n) ffz(~(n))
It should be *reversed*:
#define log2(n) flz(~(n))
or
#define log2(n) fls(n)
or just use
ilog2(n) defined in linux/log2.h.
This patch follows the last solution, recommended by Andrew Morton.
Cc: <linux-ext4@vger.kernel.org>
Cc: Mingming Cao <cmm@us.ibm.com>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Chris Ahna <christopher.j.ahna@intel.com>
Cc: David Mosberger-Tang <davidm@hpl.hp.com>
Cc: Kyle McMartin <kyle@parisc-linux.org>
Cc: Dave Airlie <airlied@linux.ie>
Cc: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r-- | drivers/char/agp/hp-agp.c | 9 | ||||
-rw-r--r-- | drivers/char/agp/i460-agp.c | 5 | ||||
-rw-r--r-- | drivers/char/agp/parisc-agp.c | 7 | ||||
-rw-r--r-- | fs/ext4/super.c | 6 |
4 files changed, 9 insertions, 18 deletions
diff --git a/drivers/char/agp/hp-agp.c b/drivers/char/agp/hp-agp.c index 313a133a1172..cbb0444467ba 100644 --- a/drivers/char/agp/hp-agp.c +++ b/drivers/char/agp/hp-agp.c @@ -14,15 +14,12 @@ #include <linux/pci.h> #include <linux/init.h> #include <linux/agp_backend.h> +#include <linux/log2.h> #include <asm/acpi-ext.h> #include "agp.h" -#ifndef log2 -#define log2(x) ffz(~(x)) -#endif - #define HP_ZX1_IOC_OFFSET 0x1000 /* ACPI reports SBA, we want IOC */ /* HP ZX1 IOC registers */ @@ -257,7 +254,7 @@ hp_zx1_configure (void) readl(hp->ioc_regs+HP_ZX1_IMASK); writel(hp->iova_base|1, hp->ioc_regs+HP_ZX1_IBASE); readl(hp->ioc_regs+HP_ZX1_IBASE); - writel(hp->iova_base|log2(HP_ZX1_IOVA_SIZE), hp->ioc_regs+HP_ZX1_PCOM); + writel(hp->iova_base|ilog2(HP_ZX1_IOVA_SIZE), hp->ioc_regs+HP_ZX1_PCOM); readl(hp->ioc_regs+HP_ZX1_PCOM); } @@ -285,7 +282,7 @@ hp_zx1_tlbflush (struct agp_memory *mem) { struct _hp_private *hp = &hp_private; - writeq(hp->gart_base | log2(hp->gart_size), hp->ioc_regs+HP_ZX1_PCOM); + writeq(hp->gart_base | ilog2(hp->gart_size), hp->ioc_regs+HP_ZX1_PCOM); readq(hp->ioc_regs+HP_ZX1_PCOM); } diff --git a/drivers/char/agp/i460-agp.c b/drivers/char/agp/i460-agp.c index 70117df4d067..e72a83e2bad5 100644 --- a/drivers/char/agp/i460-agp.c +++ b/drivers/char/agp/i460-agp.c @@ -13,6 +13,7 @@ #include <linux/string.h> #include <linux/slab.h> #include <linux/agp_backend.h> +#include <linux/log2.h> #include "agp.h" @@ -59,8 +60,6 @@ */ #define WR_FLUSH_GATT(index) RD_GATT(index) -#define log2(x) ffz(~(x)) - static struct { void *gatt; /* ioremap'd GATT area */ @@ -148,7 +147,7 @@ static int i460_fetch_size (void) * values[i].size. */ values[i].num_entries = (values[i].size << 8) >> (I460_IO_PAGE_SHIFT - 12); - values[i].page_order = log2((sizeof(u32)*values[i].num_entries) >> PAGE_SHIFT); + values[i].page_order = ilog2((sizeof(u32)*values[i].num_entries) >> PAGE_SHIFT); } for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) { diff --git a/drivers/char/agp/parisc-agp.c b/drivers/char/agp/parisc-agp.c index f4562cc22343..2939e3570f9d 100644 --- a/drivers/char/agp/parisc-agp.c +++ b/drivers/char/agp/parisc-agp.c @@ -18,6 +18,7 @@ #include <linux/init.h> #include <linux/klist.h> #include <linux/agp_backend.h> +#include <linux/log2.h> #include <asm-parisc/parisc-device.h> #include <asm-parisc/ropes.h> @@ -27,10 +28,6 @@ #define DRVNAME "quicksilver" #define DRVPFX DRVNAME ": " -#ifndef log2 -#define log2(x) ffz(~(x)) -#endif - #define AGP8X_MODE_BIT 3 #define AGP8X_MODE (1 << AGP8X_MODE_BIT) @@ -92,7 +89,7 @@ parisc_agp_tlbflush(struct agp_memory *mem) { struct _parisc_agp_info *info = &parisc_agp_info; - writeq(info->gart_base | log2(info->gart_size), info->ioc_regs+IOC_PCOM); + writeq(info->gart_base | ilog2(info->gart_size), info->ioc_regs+IOC_PCOM); readq(info->ioc_regs+IOC_PCOM); /* flush */ } diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 22158ebfae2a..fc3eb79faa49 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1415,8 +1415,6 @@ static void ext4_orphan_cleanup (struct super_block * sb, sb->s_flags = s_flags; /* Restore MS_RDONLY status */ } -#define log2(n) ffz(~(n)) - /* * Maximal file size. There is a direct, and {,double-,triple-}indirect * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. @@ -1689,8 +1687,8 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent) sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); sbi->s_sbh = bh; sbi->s_mount_state = le16_to_cpu(es->s_state); - sbi->s_addr_per_block_bits = log2(EXT4_ADDR_PER_BLOCK(sb)); - sbi->s_desc_per_block_bits = log2(EXT4_DESC_PER_BLOCK(sb)); + sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); + sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); for (i=0; i < 4; i++) sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); sbi->s_def_hash_version = es->s_def_hash_version; |