diff options
| author | Mike Travis <travis@sgi.com> | 2008-01-30 13:30:55 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:30:55 +0100 |
| commit | 7bf0c23ed24b0d95a2a717f86dce1f210e16f8a5 (patch) | |
| tree | 64f1d21cfcc7746d430c4ad70c864e176536ac8d /arch/x86/xen/smp.c | |
| parent | 0fa376e027f0bd71368e1485f863f0dff8f7c897 (diff) | |
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/xen/smp.c')
| -rw-r--r-- | arch/x86/xen/smp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c index c1b131bcdcb..8e1234e1455 100644 --- a/arch/x86/xen/smp.c +++ b/arch/x86/xen/smp.c @@ -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 |