github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-09-22 12:44:03 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

powerpc/pseries: Skip vpa_init() for boot cpu in smp_setup_cpu()

Browse Source 
During pSeries_setup_arch(), VPA for boot-cpu is first to be
initialized. However later in the boot, smp_setup_cpu() is called for
setting up VPA on boot and secondary cpus that were brought online. This
results in vpa_init() being called twice for boot-cpu and three redundant
H_REGISTER_VPA hcalls being made to the hypervisor.

Fix this by adding an extra condition in smp_set_cpu() to call vpa_init()
only on non boot-cpus.

Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260708015842.274690-1-vaibhav@linux.ibm.com
This commit is contained in:
Vaibhav Jain 2026-07-08 07:28:40 +05:30 committed by Madhavan Srinivasan
parent 810d07fb4c
commit 8f45abd50a
1 changed files with 6 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/powerpc/platforms/pseries/smp.c
View File

@ -128,7 +128,12 @@ static void smp_setup_cpu(int cpu)
else if (cpu != boot_cpuid)
xics_setup_cpu();
if (firmware_has_feature(FW_FEATURE_SPLPAR))
/*
* Initialize VPA on non-boot cpus since boot-cpu vpa was
* already initialized in pSeries_setup_arch()
*/
if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
cpu != boot_cpuid)
vpa_init(cpu);
cpumask_clear_cpu(cpu, of_spin_mask);