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| author | Mike Travis | 2008-01-30 13:30:55 +0100 |
|---|---|---|
| committer | Ingo Molnar | 2008-01-30 13:30:55 +0100 |
| commit | 7bf0c23ed24b0d95a2a717f86dce1f210e16f8a5 (patch) | |
| tree | 64f1d21cfcc7746d430c4ad70c864e176536ac8d /arch/x86/kernel/smp_32.c | |
| parent | x86: PTRACE_SINGLEBLOCK (diff) | |
| download | kernel-qcow2-linux-7bf0c23ed24b0d95a2a717f86dce1f210e16f8a5.tar.gz kernel-qcow2-linux-7bf0c23ed24b0d95a2a717f86dce1f210e16f8a5.tar.xz kernel-qcow2-linux-7bf0c23ed24b0d95a2a717f86dce1f210e16f8a5.zip | |
x86: prevent dereferencing non-allocated per_cpu variables
'for_each_possible_cpu(i)' when there's a _remote possibility_ of
dereferencing a non-allocated per_cpu variable involved.
All files except mm/vmstat.c are x86 arch.
Thanks to pageexec@freemail.hu for pointing this out.
Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: <pageexec@freemail.hu>
Cc: Andi Kleen <ak@suse.de>
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/smp_32.c')
| -rw-r--r-- | arch/x86/kernel/smp_32.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kernel/smp_32.c b/arch/x86/kernel/smp_32.c index fcaa026eb807..d4c01a4aca60 100644 --- a/arch/x86/kernel/smp_32.c +++ b/arch/x86/kernel/smp_32.c @@ -223,7 +223,7 @@ void send_IPI_mask_sequence(cpumask_t mask, int vector) */ local_irq_save(flags); - for (query_cpu = 0; query_cpu < NR_CPUS; ++query_cpu) { + for_each_possible_cpu(query_cpu) { if (cpu_isset(query_cpu, mask)) { __send_IPI_dest_field(cpu_to_logical_apicid(query_cpu), vector); @@ -675,7 +675,7 @@ static int convert_apicid_to_cpu(int apic_id) { int i; - for (i = 0; i < NR_CPUS; i++) { + for_each_possible_cpu(i) { if (per_cpu(x86_cpu_to_apicid, i) == apic_id) return i; } |