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Subject[tip: ras/core] x86/MCE/AMD: Do not use rdmsr_safe_on_cpu() in smca_configure()
The following commit has been merged into the ras/core branch of tip:

Commit-ID: 17ba1939e3676417590ec6f7555608e137e1719a
Gitweb: https://git.kernel.org/tip/17ba1939e3676417590ec6f7555608e137e1719a
Author: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
AuthorDate: Thu, 31 Oct 2019 16:04:48 +03:00
Committer: Borislav Petkov <bp@suse.de>
CommitterDate: Mon, 09 Dec 2019 14:54:59 +01:00

x86/MCE/AMD: Do not use rdmsr_safe_on_cpu() in smca_configure()

The function smca_configure() is called only on the current CPU
therefore replace rdmsr_safe_on_cpu() with atomic rdmsr_safe() and avoid
the IPI.

[ bp: Cleanup commit message. ]

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/157252708836.3876.4604398213417262402.stgit@buzz
---
arch/x86/kernel/cpu/mce/amd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 5167bd2..e41e3b4 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -269,7 +269,7 @@ static void smca_configure(unsigned int bank, unsigned int cpu)
if (smca_banks[bank].hwid)
return;

- if (rdmsr_safe_on_cpu(cpu, MSR_AMD64_SMCA_MCx_IPID(bank), &low, &high)) {
+ if (rdmsr_safe(MSR_AMD64_SMCA_MCx_IPID(bank), &low, &high)) {
pr_warn("Failed to read MCA_IPID for bank %d\n", bank);
return;
}
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