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authorMike Travis <travis@sgi.com>2008-04-05 05:11:01 +0400
committerIngo Molnar <mingo@elte.hu>2008-04-19 21:44:59 +0400
commit9f0e8d0400d925c3acd5f4e01dbeb736e4011882 (patch)
tree970dab54eeba019e4649aa32730489206be5f8a2 /include/linux/cpumask.h
parent321a8e9dcb714f3c350ba55e41ed447bf3f05fac (diff)
downloadlinux-9f0e8d0400d925c3acd5f4e01dbeb736e4011882.tar.xz
x86: convert cpumask_of_cpu macro to allocated array
* Here is a simple patch to use an allocated array of cpumasks to represent cpumask_of_cpu() instead of constructing one on the stack. It's based on the Kconfig option "HAVE_CPUMASK_OF_CPU_MAP" which is currently only set for x86_64 SMP. Otherwise the the existing cpumask_of_cpu() is used but has been changed to produce an lvalue so a pointer to it can be used. Cc: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/cpumask.h')
-rw-r--r--include/linux/cpumask.h12
1 files changed, 9 insertions, 3 deletions
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 629102feaa66..259c8051155d 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -222,8 +222,13 @@ int __next_cpu(int n, const cpumask_t *srcp);
#define next_cpu(n, src) ({ (void)(src); 1; })
#endif
+#ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
+extern cpumask_t *cpumask_of_cpu_map;
+#define cpumask_of_cpu(cpu) (cpumask_of_cpu_map[cpu])
+
+#else
#define cpumask_of_cpu(cpu) \
-({ \
+(*({ \
typeof(_unused_cpumask_arg_) m; \
if (sizeof(m) == sizeof(unsigned long)) { \
m.bits[0] = 1UL<<(cpu); \
@@ -231,8 +236,9 @@ int __next_cpu(int n, const cpumask_t *srcp);
cpus_clear(m); \
cpu_set((cpu), m); \
} \
- m; \
-})
+ &m; \
+}))
+#endif
#define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)