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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2023-11-22 09:56:26 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-11-22 09:56:26 -0800 |
| commit | 05c8c94ed407499279b2a552e7ee9bb03e859b7b (patch) | |
| tree | 45baf7c954fce18cb2ebb0345ba37379af81a58b /arch/x86/kernel/cpu/mshyperv.c | |
| parent | 125b0bb95dd6bec81b806b997a4ccb026eeecf8f (diff) | |
| parent | 18286883e779fb79b413a7462968ee3f6768f19c (diff) | |
| download | lwn-05c8c94ed407499279b2a552e7ee9bb03e859b7b.tar.gz lwn-05c8c94ed407499279b2a552e7ee9bb03e859b7b.zip | |
Merge tag 'hyperv-fixes-signed-20231121' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
Pull hyperv fixes from Wei Liu:
- One fix for the KVP daemon (Ani Sinha)
- Fix for the detection of E820_TYPE_PRAM in a Gen2 VM (Saurabh Sengar)
- Micro-optimization for hv_nmi_unknown() (Uros Bizjak)
* tag 'hyperv-fixes-signed-20231121' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
x86/hyperv: Use atomic_try_cmpxchg() to micro-optimize hv_nmi_unknown()
x86/hyperv: Fix the detection of E820_TYPE_PRAM in a Gen2 VM
hv/hv_kvp_daemon: Some small fixes for handling NM keyfiles
Diffstat (limited to 'arch/x86/kernel/cpu/mshyperv.c')
| -rw-r--r-- | arch/x86/kernel/cpu/mshyperv.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index e6bba12c759c..01fa06dd06b6 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -262,11 +262,14 @@ static uint32_t __init ms_hyperv_platform(void) static int hv_nmi_unknown(unsigned int val, struct pt_regs *regs) { static atomic_t nmi_cpu = ATOMIC_INIT(-1); + unsigned int old_cpu, this_cpu; if (!unknown_nmi_panic) return NMI_DONE; - if (atomic_cmpxchg(&nmi_cpu, -1, raw_smp_processor_id()) != -1) + old_cpu = -1; + this_cpu = raw_smp_processor_id(); + if (!atomic_try_cmpxchg(&nmi_cpu, &old_cpu, this_cpu)) return NMI_HANDLED; return NMI_DONE; |