Messages in this thread Patch in this message | | | From | "Joerg Roedel" <> | Subject | [PATCH 1/2] x86: mce init optimization and signedness fixup | Date | Thu, 11 Oct 2007 14:17:53 +0200 |
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MCG_CAP never reports a negative count of available error-reporting banks. Therefore, make nr_mce_banks unsigned. Check for MCA/MCE feature bits as early as possible.
Signed-off-by: Christoph Egger <Christoph.Egger@amd.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> --- arch/x86/kernel/cpu/mcheck/mce.c | 12 ++++++++++-- arch/x86/kernel/cpu/mcheck/mce.h | 2 +- 2 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c index 34c781e..e1ac4f7 100644 --- a/arch/x86/kernel/cpu/mcheck/mce.c +++ b/arch/x86/kernel/cpu/mcheck/mce.c @@ -17,7 +17,7 @@ #include "mce.h" int mce_disabled = 0; -int nr_mce_banks; +unsigned int nr_mce_banks; EXPORT_SYMBOL_GPL(nr_mce_banks); /* non-fatal.o */ @@ -33,8 +33,16 @@ void fastcall (*machine_check_vector)(struct pt_regs *, long error_code) = unexp /* This has to be run for each processor */ void mcheck_init(struct cpuinfo_x86 *c) { - if (mce_disabled==1) + if (mce_disabled == 1) { + printk(KERN_INFO "MCE support disabled by bootparam\n"); return; + } + + if (!cpu_has(c, X86_FEATURE_MCA) || !cpu_has(c, X86_FEATURE_MCE)) { + printk(KERN_INFO "CPU%i: No machine check support available\n", + smp_processor_id()); + return; + } switch (c->x86_vendor) { case X86_VENDOR_AMD: diff --git a/arch/x86/kernel/cpu/mcheck/mce.h b/arch/x86/kernel/cpu/mcheck/mce.h index 81fb6e2..9cbe812 100644 --- a/arch/x86/kernel/cpu/mcheck/mce.h +++ b/arch/x86/kernel/cpu/mcheck/mce.h @@ -10,5 +10,5 @@ void winchip_mcheck_init(struct cpuinfo_x86 *c); /* Call the installed machine check handler for this CPU setup. */ extern fastcall void (*machine_check_vector)(struct pt_regs *, long error_code); -extern int nr_mce_banks; +extern unsigned int nr_mce_banks; -- 1.5.2.5
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