linux-kernel - [PATCH][RSDL-mm 4/7] sched: implement 180 bit sched bitmap

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Date:	Sun, 11 Mar 2007 15:01:16 +1100
From:	Con Kolivas <kernel@...ivas.org>
To:	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	ck list <ck@....kolivas.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH][RSDL-mm 4/7] sched: implement 180 bit sched bitmap

From: Con Kolivas <kernel@...ivas.org>

Modify the sched_find_first_bit function to work on a 180bit long bitmap.

Signed-off-by: Con Kolivas <kernel@...ivas.org>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Nick Piggin <nickpiggin@...oo.com.au>
Cc: "Siddha, Suresh B" <suresh.b.siddha@...el.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 include/asm-generic/bitops/sched.h |   10 ++++++----
 include/asm-s390/bitops.h          |   12 +-----------
 2 files changed, 7 insertions(+), 15 deletions(-)

Index: linux-2.6.21-rc3-mm2/include/asm-generic/bitops/sched.h
===================================================================
--- linux-2.6.21-rc3-mm2.orig/include/asm-generic/bitops/sched.h	2007-03-11 14:47:57.000000000 +1100
+++ linux-2.6.21-rc3-mm2/include/asm-generic/bitops/sched.h	2007-03-11 14:47:59.000000000 +1100
@@ -6,8 +6,8 @@
 
 /*
  * Every architecture must define this function. It's the fastest
- * way of searching a 140-bit bitmap where the first 100 bits are
- * unlikely to be set. It's guaranteed that at least one of the 140
+ * way of searching a 180-bit bitmap where the first 100 bits are
+ * unlikely to be set. It's guaranteed that at least one of the 180
  * bits is cleared.
  */
 static inline int sched_find_first_bit(const unsigned long *b)
@@ -15,7 +15,7 @@ static inline int sched_find_first_bit(c
 #if BITS_PER_LONG == 64
 	if (unlikely(b[0]))
 		return __ffs(b[0]);
-	if (likely(b[1]))
+	if (b[1])
 		return __ffs(b[1]) + 64;
 	return __ffs(b[2]) + 128;
 #elif BITS_PER_LONG == 32
@@ -27,7 +27,9 @@ static inline int sched_find_first_bit(c
 		return __ffs(b[2]) + 64;
 	if (b[3])
 		return __ffs(b[3]) + 96;
-	return __ffs(b[4]) + 128;
+	if (b[4])
+		return __ffs(b[4]) + 128;
+	return __ffs(b[5]) + 160;
 #else
 #error BITS_PER_LONG not defined
 #endif
Index: linux-2.6.21-rc3-mm2/include/asm-s390/bitops.h
===================================================================
--- linux-2.6.21-rc3-mm2.orig/include/asm-s390/bitops.h	2007-03-11 14:47:57.000000000 +1100
+++ linux-2.6.21-rc3-mm2/include/asm-s390/bitops.h	2007-03-11 14:47:59.000000000 +1100
@@ -729,17 +729,7 @@ find_next_bit (const unsigned long * add
 	return offset + find_first_bit(p, size);
 }
 
-/*
- * Every architecture must define this function. It's the fastest
- * way of searching a 140-bit bitmap where the first 100 bits are
- * unlikely to be set. It's guaranteed that at least one of the 140
- * bits is cleared.
- */
-static inline int sched_find_first_bit(unsigned long *b)
-{
-	return find_first_bit(b, 140);
-}
-
+#include <asm-generic/bitops/sched.h>
 #include <asm-generic/bitops/ffs.h>
 
 #include <asm-generic/bitops/fls.h>

-- 
-ck
-
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