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| author | Keir Fraser <keir.fraser@citrix.com> | 2010-05-18 15:13:45 +0100 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2010-05-18 15:13:45 +0100 |
| commit | 00c51c29c14611cdb4164fc64e89b6e7ad6c1df2 (patch) | |
| tree | 4c4462e5d66a0bc71b12f669a3a3c9a17c682b1d /xen/include/asm-x86/percpu.h | |
| parent | c12bbde846af61d1b8441da6c627181ccbc7a157 (diff) | |
| download | xen-00c51c29c14611cdb4164fc64e89b6e7ad6c1df2.tar.gz xen-00c51c29c14611cdb4164fc64e89b6e7ad6c1df2.tar.bz2 xen-00c51c29c14611cdb4164fc64e89b6e7ad6c1df2.zip | |
x86: Dynamically allocate percpu data area when a CPU comes online.
At the same time, the data area starts life zeroed.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
Diffstat (limited to 'xen/include/asm-x86/percpu.h')
| -rw-r--r-- | xen/include/asm-x86/percpu.h | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/xen/include/asm-x86/percpu.h b/xen/include/asm-x86/percpu.h index d8860203ae..fb1d4140ec 100644 --- a/xen/include/asm-x86/percpu.h +++ b/xen/include/asm-x86/percpu.h @@ -1,17 +1,20 @@ #ifndef __X86_PERCPU_H__ #define __X86_PERCPU_H__ -#define PERCPU_SHIFT 13 -#define PERCPU_SIZE (1UL << PERCPU_SHIFT) +#ifndef __ASSEMBLY__ +extern char __per_cpu_start[], __per_cpu_data_end[]; +extern unsigned long __per_cpu_offset[NR_CPUS]; +void percpu_init_areas(void); +#endif /* Separate out the type, so (int[3], foo) works. */ #define __DEFINE_PER_CPU(type, name, suffix) \ - __attribute__((__section__(".data.percpu" #suffix))) \ + __attribute__((__section__(".bss.percpu" #suffix))) \ __typeof__(type) per_cpu_##name /* var is in discarded region: offset to particular copy we want */ #define per_cpu(var, cpu) \ - (*RELOC_HIDE(&per_cpu__##var, ((unsigned int)(cpu))<<PERCPU_SHIFT)) + (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu])) #define __get_cpu_var(var) \ (per_cpu(var, smp_processor_id())) |