The patch titled
LOG2: Provide ilog2() fallbacks for powerpc
has been added to the -mm tree. Its filename is
log2-provide-ilog2-fallbacks-for-powerpc.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: LOG2: Provide ilog2() fallbacks for powerpc
From: David Howells <dhowells@xxxxxxxxxx>
Provide ilog2() fallbacks for powerpc for 32-bit numbers and 64-bit numbers on
ppc64.
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/powerpc/Kconfig | 4 ++--
include/asm-powerpc/bitops.h | 21 ++++++++++++++++++++-
include/asm-powerpc/page_32.h | 10 +---------
3 files changed, 23 insertions(+), 12 deletions(-)
diff -puN arch/powerpc/Kconfig~log2-provide-ilog2-fallbacks-for-powerpc arch/powerpc/Kconfig
--- a/arch/powerpc/Kconfig~log2-provide-ilog2-fallbacks-for-powerpc
+++ a/arch/powerpc/Kconfig
@@ -43,11 +43,11 @@ config RWSEM_XCHGADD_ALGORITHM
config ARCH_HAS_ILOG2_U32
bool
- default n
+ default y
config ARCH_HAS_ILOG2_U64
bool
- default n
+ default y if 64BIT
config GENERIC_HWEIGHT
bool
diff -puN include/asm-powerpc/bitops.h~log2-provide-ilog2-fallbacks-for-powerpc include/asm-powerpc/bitops.h
--- a/include/asm-powerpc/bitops.h~log2-provide-ilog2-fallbacks-for-powerpc
+++ a/include/asm-powerpc/bitops.h
@@ -190,7 +190,8 @@ static __inline__ void set_bits(unsigned
* Return the zero-based bit position (LE, not IBM bit numbering) of
* the most significant 1-bit in a double word.
*/
-static __inline__ int __ilog2(unsigned long x)
+static __inline__ __attribute__((const))
+int __ilog2(unsigned long x)
{
int lz;
@@ -198,6 +199,24 @@ static __inline__ int __ilog2(unsigned l
return BITS_PER_LONG - 1 - lz;
}
+static inline __attribute__((const))
+int __ilog2_u32(u32 n)
+{
+ int bit;
+ asm ("cntlzw %0,%1" : "=r" (bit) : "r" (n));
+ return 31 - bit;
+}
+
+#ifdef __powerpc64__
+static inline __attribute__((const))
+int __ilog2_u64(u32 n)
+{
+ int bit;
+ asm ("cntlzd %0,%1" : "=r" (bit) : "r" (n));
+ return 63 - bit;
+}
+#endif
+
/*
* Determines the bit position of the least significant 0 bit in the
* specified double word. The returned bit position will be
diff -puN include/asm-powerpc/page_32.h~log2-provide-ilog2-fallbacks-for-powerpc include/asm-powerpc/page_32.h
--- a/include/asm-powerpc/page_32.h~log2-provide-ilog2-fallbacks-for-powerpc
+++ a/include/asm-powerpc/page_32.h
@@ -26,15 +26,7 @@ extern void clear_pages(void *page, int
static inline void clear_page(void *page) { clear_pages(page, 0); }
extern void copy_page(void *to, void *from);
-/* Pure 2^n version of get_order */
-extern __inline__ int get_order(unsigned long size)
-{
- int lz;
-
- size = (size-1) >> PAGE_SHIFT;
- asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
- return 32 - lz;
-}
+#include <asm-generic/page.h>
#endif /* __ASSEMBLY__ */
_
Patches currently in -mm which might be from dhowells@xxxxxxxxxx are
origin.patch
i386-irqs-build-fix.patch
irq_reqs-export-__irq_regs.patch
um-irq-changes-break-build.patch
x86_64-irq_regs-fix.patch
nfs-represent-64-bit-fileids-as-64-bit-inode-numbers-on-32-bit-systems.patch
reiserfs-make-sure-all-dentries-refs-are-released-before-calling-kill_block_super-try-2.patch
fs-cache-provide-a-filesystem-specific-syncable-page-bit.patch
fs-cache-generic-filesystem-caching-facility.patch
fs-cache-release-page-private-in-failed-readahead.patch
fs-cache-release-page-private-after-failed-readahead-12.patch
fs-cache-make-kafs-use-fs-cache.patch
fs-cache-make-kafs-use-fs-cache-fix.patch
fs-cache-make-kafs-use-fs-cache-12.patch
fs-cache-make-kafs-use-fs-cache-12-fix.patch
fs-cache-make-kafs-use-fs-cache-kconfig-fix.patch
fs-cache-make-kafs-use-fs-cache-vs-streamline-generic_file_-interfaces-and-filemap.patch
nfs-use-local-caching.patch
nfs-use-local-caching-12.patch
nfs-use-local-caching-12-fix.patch
nfs-use-local-caching-kconfig-fix.patch
nfs-use-local-caching-configh.patch
add-missing-page_copy-export-for-ppc-and-powerpc.patch
fs-cache-cachefiles-ia64-missing-copy_page-export.patch
fs-cache-cachefiles-a-cache-that-backs-onto-a-mounted-filesystem.patch
fs-cache-cachefiles-a-cache-that-backs-onto-a-mounted-filesystem-fscache-fix-gfp_t-sparse-annotations.patch
fs-cache-cachefiles-a-cache-that-backs-onto-a-mounted-filesystem-cachefiles-printk-format-warning.patch
fs-cache-cachefiles-a-cache-that-backs-onto-a-mounted-filesystem-warning-fixes.patch
fs-cache-cachefiles-a-cache-that-backs-onto-a-mounted-filesystem-cachefiles-cachefiles_write_page-shouldnt-indicate-error-twice.patch
fscache-kconfig-tidying.patch
fs-cache-cachefiles-a-cache-that-backs-onto-a-mounted-filesystem-cachefiles-handle-enospc-on-create-mkdir-better.patch
fs-cache-cachefiles-a-cache-that-backs-onto-a-mounted-filesystem-inode-count-maintenance.patch
autofs-make-sure-all-dentries-refs-are-released-before-calling-kill_anon_super.patch
vfs-destroy-the-dentries-contributed-by-a-superblock-on-unmounting.patch
afs-amend-the-afs-configuration-options.patch
reiser4-get_sb_dev-fix.patch
log2-implement-a-general-integer-log2-facility-in-the-kernel.patch
log2-alter-roundup_pow_of_two-so-that-it-can-use-a-ilog2-on-a-constant.patch
log2-alter-get_order-so-that-it-can-make-use-of-ilog2-on-a-constant.patch
log2-provide-ilog2-fallbacks-for-powerpc.patch
mutex-subsystem-synchro-test-module.patch
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