diff options
| author | Shaohua Li <shaohua.li@intel.com> | 2011-01-17 10:52:10 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-02-14 13:03:08 +0100 |
| commit | 7064d865af804b9b841e7b9a3e9b653e40c3e5ca (patch) | |
| tree | 7f4afcd7f3d9a767fe232b5455a8550c418c2898 /arch/x86/kernel/e820.c | |
| parent | 70e4a369733a21e3d16b059a6ccdad22a344bf57 (diff) | |
| download | op-kernel-dev-7064d865af804b9b841e7b9a3e9b653e40c3e5ca.zip op-kernel-dev-7064d865af804b9b841e7b9a3e9b653e40c3e5ca.tar.gz | |
x86: Avoid tlbstate lock if not enough cpus
This one isn't related to previous patch. If online cpus are
below NUM_INVALIDATE_TLB_VECTORS, we don't need the lock. The
comments in the code declares we don't need the check, but a hot
lock still needs an atomic operation and expensive, so add the
check here.
Uses nr_cpu_ids here as suggested by Eric Dumazet.
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>
LKML-Reference: <1295232730.1949.710.camel@sli10-conroe>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/e820.c')
0 files changed, 0 insertions, 0 deletions
