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author | Mark Brown <broonie@kernel.org> | 2019-06-26 14:39:34 +0300 |
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committer | Mark Brown <broonie@kernel.org> | 2019-06-26 14:39:34 +0300 |
commit | 53c8b29abe42e5601cfa0ea5962532f0cfdec8a0 (patch) | |
tree | cad53f42ce7a03c39a984bcdbcc42cd47f1af6f9 /arch/x86/power/hibernate.c | |
parent | e3303268f9cfa4eb7c2217df471417d4327109fd (diff) | |
parent | 4b972a01a7da614b4796475f933094751a295a2f (diff) | |
download | linux-53c8b29abe42e5601cfa0ea5962532f0cfdec8a0.tar.xz |
Merge tag 'v5.2-rc6' into asoc-5.3
Linux 5.2-rc6
Diffstat (limited to 'arch/x86/power/hibernate.c')
-rw-r--r-- | arch/x86/power/hibernate.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/x86/power/hibernate.c b/arch/x86/power/hibernate.c index 4845b8c7be7f..fc413717a45f 100644 --- a/arch/x86/power/hibernate.c +++ b/arch/x86/power/hibernate.c @@ -11,6 +11,7 @@ #include <linux/suspend.h> #include <linux/scatterlist.h> #include <linux/kdebug.h> +#include <linux/cpu.h> #include <crypto/hash.h> @@ -245,3 +246,35 @@ out: __flush_tlb_all(); return 0; } + +int arch_resume_nosmt(void) +{ + int ret = 0; + /* + * We reached this while coming out of hibernation. This means + * that SMT siblings are sleeping in hlt, as mwait is not safe + * against control transition during resume (see comment in + * hibernate_resume_nonboot_cpu_disable()). + * + * If the resumed kernel has SMT disabled, we have to take all the + * SMT siblings out of hlt, and offline them again so that they + * end up in mwait proper. + * + * Called with hotplug disabled. + */ + cpu_hotplug_enable(); + if (cpu_smt_control == CPU_SMT_DISABLED || + cpu_smt_control == CPU_SMT_FORCE_DISABLED) { + enum cpuhp_smt_control old = cpu_smt_control; + + ret = cpuhp_smt_enable(); + if (ret) + goto out; + ret = cpuhp_smt_disable(old); + if (ret) + goto out; + } +out: + cpu_hotplug_disable(); + return ret; +} |