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x86: convert cpumask_of_cpu macro to allocated array

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* 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>
This commit is contained in:
Mike Travis 2008-04-04 18:11:01 -07:00 • committed by Ingo Molnar
parent 321a8e9dcb
commit 9f0e8d0400
3 changed files with 39 additions and 4 deletions
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12
include/linux/cpumask.h
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@ -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)