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x86: prevent dereferencing non-allocated per_cpu variables

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'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>
This commit is contained in:
Mike Travis
2008-01-30 13:30:55 +01:00
committed by Ingo Molnar
parent 0fa376e027
commit 7bf0c23ed2
3 changed files with 6 additions and 6 deletions
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4
arch/x86/xen/smp.c
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@@ -146,7 +146,7 @@ void __init xen_smp_prepare_boot_cpu(void)
old memory can be recycled */
make_lowmem_page_readwrite(&per_cpu__gdt_page);
for (cpu = 0; cpu < NR_CPUS; cpu++) {
for_each_possible_cpu(cpu) {
cpus_clear(per_cpu(cpu_sibling_map, cpu));
/*
* cpu_core_map lives in a per cpu area that is cleared
@@ -163,7 +163,7 @@ void __init xen_smp_prepare_cpus(unsigned int max_cpus)
{
unsigned cpu;
for (cpu = 0; cpu < NR_CPUS; cpu++) {
for_each_possible_cpu(cpu) {
cpus_clear(per_cpu(cpu_sibling_map, cpu));
/*
* cpu_core_ map will be zeroed when the per