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| author | Alexander Gordeev <agordeev@redhat.com> | 2012-06-07 13:16:25 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-06-08 09:44:30 (GMT) |
| commit | 4988a40c3981212fa8c64da68722affc1cb6697a (patch) | |
| tree | 0210395a3b47a0295ca5015e6ad2d16e1bc58a5e /arch/x86/include | |
| parent | ff164324123c0fe181d8de7dadcc7b3fbe25f2cf (diff) | |
| download | linux-4988a40c3981212fa8c64da68722affc1cb6697a.tar.xz | |
x86/apic: Make cpu_mask_to_apicid() operations check cpu_online_mask
Currently cpu_mask_to_apicid() should not get a offline CPU with
the cpumask. Otherwise some apic drivers might try to access
non-existent per-cpu variables (i.e. x2apic). In that regard
cpu_mask_to_apicid() and cpu_mask_to_apicid_and() operations are
inconsistent.
This fix makes the two operations do not rely on calling
functions and always return the apicid for only online CPUs. As
result, the meaning and implementations of cpu_mask_to_apicid()
and cpu_mask_to_apicid_and() operations become straight.
Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/20120607131624.GG4759@dhcp-26-207.brq.redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/apic.h | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h index ae91f9c..1ed3eea 100644 --- a/arch/x86/include/asm/apic.h +++ b/arch/x86/include/asm/apic.h @@ -596,7 +596,7 @@ static inline int default_phys_pkg_id(int cpuid_apic, int index_msb) static inline int __flat_cpu_mask_to_apicid(unsigned long cpu_mask, unsigned int *apicid) { - cpu_mask &= APIC_ALL_CPUS; + cpu_mask = cpu_mask & APIC_ALL_CPUS & cpumask_bits(cpu_online_mask)[0]; if (likely(cpu_mask)) { *apicid = (unsigned int)cpu_mask; return 0; @@ -619,9 +619,7 @@ flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask, { unsigned long mask1 = cpumask_bits(cpumask)[0]; unsigned long mask2 = cpumask_bits(andmask)[0]; - unsigned long mask3 = cpumask_bits(cpu_online_mask)[0]; - - return __flat_cpu_mask_to_apicid(mask1 & mask2 & mask3, apicid); + return __flat_cpu_mask_to_apicid(mask1 & mask2, apicid); } extern int |