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authorMike Travis <travis@sgi.com>2007-10-19 20:35:03 +0200
committerThomas Gleixner <tglx@linutronix.de>2007-10-19 20:35:03 +0200
commit71fff5e6ca1b738ac4742580e4c0ff79d906f6c8 (patch)
tree390e67123d684ab7f490291db987e097e5b3c728 /arch/x86/kernel/genapic_flat_64.c
parentdbeb2be21d678c49a8d8bbf774903df15dd55474 (diff)
downloadop-kernel-dev-71fff5e6ca1b738ac4742580e4c0ff79d906f6c8.zip
op-kernel-dev-71fff5e6ca1b738ac4742580e4c0ff79d906f6c8.tar.gz
x86: convert cpu_to_apicid to be a per cpu variable
This patch converts the x86_cpu_to_apicid array to be a per cpu variable. This saves sizeof(apicid) * NR unused cpus. Access is mostly from startup and CPU HOTPLUG functions. MP_processor_info() is one of the functions that require access to the x86_cpu_to_apicid array before the per_cpu data area is setup. For this case, a pointer to the __initdata array is initialized in setup_arch() and removed in smp_prepare_cpus() after the per_cpu data area is initialized. A second change is included to change the initial array value of ARCH i386 from 0xff to BAD_APICID to be consistent with ARCH x86_64. Signed-off-by: Mike Travis <travis@sgi.com> Cc: Andi Kleen <ak@suse.de> Cc: Christoph Lameter <clameter@sgi.com> Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/genapic_flat_64.c')
-rw-r--r--arch/x86/kernel/genapic_flat_64.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/genapic_flat_64.c b/arch/x86/kernel/genapic_flat_64.c
index 91c75267..07352b7 100644
--- a/arch/x86/kernel/genapic_flat_64.c
+++ b/arch/x86/kernel/genapic_flat_64.c
@@ -172,7 +172,7 @@ static unsigned int physflat_cpu_mask_to_apicid(cpumask_t cpumask)
*/
cpu = first_cpu(cpumask);
if ((unsigned)cpu < NR_CPUS)
- return x86_cpu_to_apicid[cpu];
+ return per_cpu(x86_cpu_to_apicid, cpu);
else
return BAD_APICID;
}
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