Messages in this thread Patch in this message | | | From | Samuel Neves <> | Subject | [PATCH] smpboot: correctly update number of booted cores | Date | Wed, 21 Feb 2018 20:50:36 +0000 |
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Without this fix, /proc/cpuinfo will display an incorrect amount of CPU cores, after bringing them offline and online again, as exemplified below:
$ cat /proc/cpuinfo | grep cores cpu cores : 4 cpu cores : 8 cpu cores : 8 cpu cores : 20 cpu cores : 4 cpu cores : 3 cpu cores : 2 cpu cores : 2
This patch fixes this by always zeroing the booted_cores variable upon turning off a logical CPU.
Signed-off-by: Samuel Neves <sneves@dei.uc.pt> --- arch/x86/kernel/smpboot.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 9eee25d07586..ff99e2b6fc54 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1437,6 +1437,7 @@ static void remove_siblinginfo(int cpu) cpumask_clear(topology_sibling_cpumask(cpu)); cpumask_clear(topology_core_cpumask(cpu)); c->cpu_core_id = 0; + c->booted_cores = 0; cpumask_clear_cpu(cpu, cpu_sibling_setup_mask); recompute_smt_state(); } -- 2.14.3
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