Commit ceb1cbac authored by Kamalesh Babulal's avatar Kamalesh Babulal Committed by Ingo Molnar

sched/x86: Calculate booted cores after construction of sibling_mask

Commit 316ad248 ("sched/x86: Rewrite set_cpu_sibling_map()")
broke the booted_cores accounting.

The problem is that the booted_cores accounting needs all the
sibling links set up. So restore the second loop and add a comment as
to why its needed.

On qemu booted with -smp sockets=1,cores=2,threads=2;
Before:
 $ grep cores /proc/cpuinfo
 cpu cores       : 2
 cpu cores       : 1
 cpu cores       : 4
 cpu cores       : 3

With the patch:
 $ grep cores /proc/cpuinfo
 cpu cores       : 2
 cpu cores       : 2
 cpu cores       : 2
 cpu cores       : 2
Reported-by: default avatarPrarit Bhargava <prarit@redhat.com>
Reported-by: default avatarBorislav Petkov <bp@amd64.org>
Signed-off-by: default avatarKamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20120531073738.GH7511@linux.vnet.ibm.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent eea5b551
...@@ -382,6 +382,15 @@ void __cpuinit set_cpu_sibling_map(int cpu) ...@@ -382,6 +382,15 @@ void __cpuinit set_cpu_sibling_map(int cpu)
if ((i == cpu) || (has_mc && match_llc(c, o))) if ((i == cpu) || (has_mc && match_llc(c, o)))
link_mask(llc_shared, cpu, i); link_mask(llc_shared, cpu, i);
}
/*
* This needs a separate iteration over the cpus because we rely on all
* cpu_sibling_mask links to be set-up.
*/
for_each_cpu(i, cpu_sibling_setup_mask) {
o = &cpu_data(i);
if ((i == cpu) || (has_mc && match_mc(c, o))) { if ((i == cpu) || (has_mc && match_mc(c, o))) {
link_mask(core, cpu, i); link_mask(core, cpu, i);
......
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