From: Zwane Mwaikambo http://bugme.osdl.org/show_bug.cgi?id=4426 vendor_id : AuthenticAMD cpu family : 6 model : 10 model name : AMD Athlon(tm) XP stepping : 0 cpu MHz : 2204.807 cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse pni syscall mmxext 3dnowext 3dnow bogomips : 4358.14 We're marking bit 0 of extended function 0x80000001 cpuid as PNI support on AMD processors, when it actually denotes x87 FPU present. Patch for i386 and x86_64 below. Signed-off-by: Zwane Mwaikambo Cc: Andi Kleen Signed-off-by: Andrew Morton --- arch/i386/kernel/cpu/proc.c | 2 +- arch/x86_64/kernel/setup.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff -puN arch/i386/kernel/cpu/proc.c~cpuid-x87-bit-on-amd-falsely-marked-as-pni arch/i386/kernel/cpu/proc.c --- 25/arch/i386/kernel/cpu/proc.c~cpuid-x87-bit-on-amd-falsely-marked-as-pni 2005-04-26 21:14:58.800799312 -0700 +++ 25-akpm/arch/i386/kernel/cpu/proc.c 2005-04-26 21:14:58.806798400 -0700 @@ -25,7 +25,7 @@ static int show_cpuinfo(struct seq_file "fxsr", "sse", "sse2", "ss", "ht", "tm", "ia64", "pbe", /* AMD-defined */ - "pni", NULL, NULL, NULL, NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "syscall", NULL, NULL, NULL, NULL, NULL, NULL, NULL, "mp", "nx", NULL, "mmxext", NULL, NULL, "fxsr_opt", NULL, NULL, NULL, "lm", "3dnowext", "3dnow", diff -puN arch/x86_64/kernel/setup.c~cpuid-x87-bit-on-amd-falsely-marked-as-pni arch/x86_64/kernel/setup.c --- 25/arch/x86_64/kernel/setup.c~cpuid-x87-bit-on-amd-falsely-marked-as-pni 2005-04-26 21:14:58.801799160 -0700 +++ 25-akpm/arch/x86_64/kernel/setup.c 2005-04-26 21:14:58.807798248 -0700 @@ -1076,7 +1076,7 @@ static int show_cpuinfo(struct seq_file "fxsr", "sse", "sse2", "ss", "ht", "tm", "ia64", NULL, /* AMD-defined */ - "pni", NULL, NULL, NULL, NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "syscall", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "nx", NULL, "mmxext", NULL, NULL, "fxsr_opt", NULL, NULL, NULL, "lm", "3dnowext", "3dnow", _