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Subject[Patch 6 of 17] cpumask v4 - Uninline find_next_bit on ia64
mask6-unline-find-next-bit-ia64 - Uninline find_next_bit on ia64

Move the page of code (~700 bytes of instructions)
for find_next_bit and find_next_zero_bit from inline
in include/asm-ia64/bitops.h to a real function in
arch/ia64/lib/bitops.c, leaving a declaration and
macro wrapper behind.

The other arch's with almost this same code might want to
also uninline it: alpha, parisc, ppc, sh, sparc, sparc64.

These are too big to inline.

Index: 2.6.5.bitmap/include/asm-ia64/bitops.h
===================================================================
--- 2.6.5.bitmap.orig/include/asm-ia64/bitops.h 2004-04-08 03:02:48.000000000 -0700
+++ 2.6.5.bitmap/include/asm-ia64/bitops.h 2004-04-08 03:03:28.000000000 -0700
@@ -11,7 +11,7 @@

#include <linux/compiler.h>
#include <linux/types.h>
-
+#include <asm/bitops.h>
#include <asm/intrinsics.h>

/**
@@ -236,7 +236,7 @@
}

/**
- * test_and_change_bit - Change a bit and return its new value
+ * test_and_change_bit - Change a bit and return its old value
* @nr: Bit to set
* @addr: Address to count from
*
@@ -359,93 +359,21 @@

#endif /* __KERNEL__ */

-/*
- * Find next zero bit in a bitmap reasonably efficiently..
- */
-static inline int
-find_next_zero_bit (void *addr, unsigned long size, unsigned long offset)
-{
- unsigned long *p = ((unsigned long *) addr) + (offset >> 6);
- unsigned long result = offset & ~63UL;
- unsigned long tmp;
-
- if (offset >= size)
- return size;
- size -= result;
- offset &= 63UL;
- if (offset) {
- tmp = *(p++);
- tmp |= ~0UL >> (64-offset);
- if (size < 64)
- goto found_first;
- if (~tmp)
- goto found_middle;
- size -= 64;
- result += 64;
- }
- while (size & ~63UL) {
- if (~(tmp = *(p++)))
- goto found_middle;
- result += 64;
- size -= 64;
- }
- if (!size)
- return result;
- tmp = *p;
-found_first:
- tmp |= ~0UL << size;
- if (tmp == ~0UL) /* any bits zero? */
- return result + size; /* nope */
-found_middle:
- return result + ffz(tmp);
-}
+extern int __find_next_zero_bit (void *addr, unsigned long size, \
+ unsigned long offset);
+extern int __find_next_bit(const void *addr, unsigned long size, \
+ unsigned long offset);
+
+#define find_next_zero_bit(addr, size, offset) \
+ __find_next_zero_bit((addr), (size), (offset))
+#define find_next_bit(addr, size, offset) \
+ __find_next_bit((addr), (size), (offset))

/*
* The optimizer actually does good code for this case..
*/
#define find_first_zero_bit(addr, size) find_next_zero_bit((addr), (size), 0)

-/*
- * Find next bit in a bitmap reasonably efficiently..
- */
-static inline int
-find_next_bit(const void *addr, unsigned long size, unsigned long offset)
-{
- unsigned long *p = ((unsigned long *) addr) + (offset >> 6);
- unsigned long result = offset & ~63UL;
- unsigned long tmp;
-
- if (offset >= size)
- return size;
- size -= result;
- offset &= 63UL;
- if (offset) {
- tmp = *(p++);
- tmp &= ~0UL << offset;
- if (size < 64)
- goto found_first;
- if (tmp)
- goto found_middle;
- size -= 64;
- result += 64;
- }
- while (size & ~63UL) {
- if ((tmp = *(p++)))
- goto found_middle;
- result += 64;
- size -= 64;
- }
- if (!size)
- return result;
- tmp = *p;
- found_first:
- tmp &= ~0UL >> (64-size);
- if (tmp == 0UL) /* Are any bits set? */
- return result + size; /* Nope. */
- found_middle:
- return result + __ffs(tmp);
-}
-
#define find_first_bit(addr, size) find_next_bit((addr), (size), 0)

#ifdef __KERNEL__
Index: 2.6.5.bitmap/include/asm-cris/bitops.h
===================================================================
--- 2.6.5.bitmap.orig/include/asm-cris/bitops.h 2004-04-08 03:02:48.000000000 -0700
+++ 2.6.5.bitmap/include/asm-cris/bitops.h 2004-04-08 03:03:28.000000000 -0700
@@ -169,7 +169,7 @@
return retval;
}
/**
- * test_and_change_bit - Change a bit and return its new value
+ * test_and_change_bit - Change a bit and return its old value
* @nr: Bit to change
* @addr: Address to count from
*
Index: 2.6.5.bitmap/include/asm-i386/bitops.h
===================================================================
--- 2.6.5.bitmap.orig/include/asm-i386/bitops.h 2004-04-08 03:02:48.000000000 -0700
+++ 2.6.5.bitmap/include/asm-i386/bitops.h 2004-04-08 03:03:28.000000000 -0700
@@ -212,7 +212,7 @@
}

/**
- * test_and_change_bit - Change a bit and return its new value
+ * test_and_change_bit - Change a bit and return its old value
* @nr: Bit to change
* @addr: Address to count from
*
Index: 2.6.5.bitmap/include/asm-mips/bitops.h
===================================================================
--- 2.6.5.bitmap.orig/include/asm-mips/bitops.h 2004-04-08 03:02:48.000000000 -0700
+++ 2.6.5.bitmap/include/asm-mips/bitops.h 2004-04-08 03:03:28.000000000 -0700
@@ -296,7 +296,7 @@
}

/*
- * test_and_change_bit - Change a bit and return its new value
+ * test_and_change_bit - Change a bit and return its old value
* @nr: Bit to change
* @addr: Address to count from
*
@@ -567,7 +567,7 @@
}

/*
- * test_and_change_bit - Change a bit and return its new value
+ * test_and_change_bit - Change a bit and return its old value
* @nr: Bit to change
* @addr: Address to count from
*
Index: 2.6.5.bitmap/include/asm-x86_64/bitops.h
===================================================================
--- 2.6.5.bitmap.orig/include/asm-x86_64/bitops.h 2004-04-08 03:02:48.000000000 -0700
+++ 2.6.5.bitmap/include/asm-x86_64/bitops.h 2004-04-08 03:03:28.000000000 -0700
@@ -204,7 +204,7 @@
}

/**
- * test_and_change_bit - Change a bit and return its new value
+ * test_and_change_bit - Change a bit and return its old value
* @nr: Bit to change
* @addr: Address to count from
*
Index: 2.6.5.bitmap/arch/ia64/lib/bitop.c
===================================================================
--- 2.6.5.bitmap.orig/arch/ia64/lib/bitop.c 2004-04-08 03:03:18.000000000 -0700
+++ 2.6.5.bitmap/arch/ia64/lib/bitop.c 2004-04-08 03:03:28.000000000 -0700
@@ -0,0 +1,88 @@
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <asm/intrinsics.h>
+#include <linux/module.h>
+#include <asm/bitops.h>
+
+/*
+ * Find next zero bit in a bitmap reasonably efficiently..
+ */
+
+int __find_next_zero_bit (void *addr, unsigned long size, unsigned long offset)
+{
+ unsigned long *p = ((unsigned long *) addr) + (offset >> 6);
+ unsigned long result = offset & ~63UL;
+ unsigned long tmp;
+
+ if (offset >= size)
+ return size;
+ size -= result;
+ offset &= 63UL;
+ if (offset) {
+ tmp = *(p++);
+ tmp |= ~0UL >> (64-offset);
+ if (size < 64)
+ goto found_first;
+ if (~tmp)
+ goto found_middle;
+ size -= 64;
+ result += 64;
+ }
+ while (size & ~63UL) {
+ if (~(tmp = *(p++)))
+ goto found_middle;
+ result += 64;
+ size -= 64;
+ }
+ if (!size)
+ return result;
+ tmp = *p;
+found_first:
+ tmp |= ~0UL << size;
+ if (tmp == ~0UL) /* any bits zero? */
+ return result + size; /* nope */
+found_middle:
+ return result + ffz(tmp);
+}
+EXPORT_SYMBOL(__find_next_zero_bit);
+
+/*
+ * Find next bit in a bitmap reasonably efficiently..
+ */
+int __find_next_bit(const void *addr, unsigned long size, unsigned long offset)
+{
+ unsigned long *p = ((unsigned long *) addr) + (offset >> 6);
+ unsigned long result = offset & ~63UL;
+ unsigned long tmp;
+
+ if (offset >= size)
+ return size;
+ size -= result;
+ offset &= 63UL;
+ if (offset) {
+ tmp = *(p++);
+ tmp &= ~0UL << offset;
+ if (size < 64)
+ goto found_first;
+ if (tmp)
+ goto found_middle;
+ size -= 64;
+ result += 64;
+ }
+ while (size & ~63UL) {
+ if ((tmp = *(p++)))
+ goto found_middle;
+ result += 64;
+ size -= 64;
+ }
+ if (!size)
+ return result;
+ tmp = *p;
+ found_first:
+ tmp &= ~0UL >> (64-size);
+ if (tmp == 0UL) /* Are any bits set? */
+ return result + size; /* Nope. */
+ found_middle:
+ return result + __ffs(tmp);
+}
+EXPORT_SYMBOL(__find_next_bit);
Index: 2.6.5.bitmap/arch/ia64/lib/Makefile
===================================================================
--- 2.6.5.bitmap.orig/arch/ia64/lib/Makefile 2004-04-08 03:01:12.000000000 -0700
+++ 2.6.5.bitmap/arch/ia64/lib/Makefile 2004-04-08 03:03:28.000000000 -0700
@@ -6,7 +6,7 @@

lib-y := __divsi3.o __udivsi3.o __modsi3.o __umodsi3.o \
__divdi3.o __udivdi3.o __moddi3.o __umoddi3.o \
- checksum.o clear_page.o csum_partial_copy.o copy_page.o \
+ bitop.o checksum.o clear_page.o csum_partial_copy.o copy_page.o \
clear_user.o strncpy_from_user.o strlen_user.o strnlen_user.o \
flush.o ip_fast_csum.o do_csum.o \
memset.o strlen.o swiotlb.o

--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@sgi.com> 1.650.933.1373
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