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| author | Mike Travis <travis@sgi.com> | 2007-10-19 20:35:03 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2007-10-19 20:35:03 +0200 |
| commit | 71fff5e6ca1b738ac4742580e4c0ff79d906f6c8 (patch) | |
| tree | 390e67123d684ab7f490291db987e097e5b3c728 /include/asm-x86/smp_64.h | |
| parent | dbeb2be21d678c49a8d8bbf774903df15dd55474 (diff) | |
| download | op-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 'include/asm-x86/smp_64.h')
| -rw-r--r-- | include/asm-x86/smp_64.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/asm-x86/smp_64.h b/include/asm-x86/smp_64.h index 9d35018..f154570 100644 --- a/include/asm-x86/smp_64.h +++ b/include/asm-x86/smp_64.h @@ -86,7 +86,9 @@ static inline int hard_smp_processor_id(void) * Some lowlevel functions might want to know about * the real APIC ID <-> CPU # mapping. */ -extern u8 x86_cpu_to_apicid[NR_CPUS]; /* physical ID */ +extern u8 __initdata x86_cpu_to_apicid_init[]; +extern void *x86_cpu_to_apicid_ptr; +DECLARE_PER_CPU(u8, x86_cpu_to_apicid); /* physical ID */ extern u8 bios_cpu_apicid[]; static inline int cpu_present_to_apicid(int mps_cpu) @@ -117,7 +119,7 @@ static __inline int logical_smp_processor_id(void) } #ifdef CONFIG_SMP -#define cpu_physical_id(cpu) x86_cpu_to_apicid[cpu] +#define cpu_physical_id(cpu) per_cpu(x86_cpu_to_apicid, cpu) #else #define cpu_physical_id(cpu) boot_cpu_id #endif /* !CONFIG_SMP */ |
