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| author | Yinghai Lu <yinghai@kernel.org> | 2012-02-12 09:53:57 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2012-02-12 19:12:21 +0100 |
| commit | 21c3fcf3e39353d4f21d50e257cc74f3204b1988 (patch) | |
| tree | efb39e04d8f469cc6e237aa403ce4a3c80bf6e76 /arch/x86/kernel | |
| parent | 8df54d622a120058ee8bec38743c9b8f091c8e58 (diff) | |
| download | op-kernel-dev-21c3fcf3e39353d4f21d50e257cc74f3204b1988.zip op-kernel-dev-21c3fcf3e39353d4f21d50e257cc74f3204b1988.tar.gz | |
x86/debug: Fix/improve the show_msr=<cpus> debug print out
Found out that show_msr=<cpus> is broken, when I asked a
user to use it to capture debug info about broken MTRR's
whose MTRR settings are probably different between CPUs.
Only the first CPUs MSRs are printed, but that is not
enough to track down the suspected bug.
For years we called print_cpu_msr from print_cpu_info(),
but this commit:
| commit 2eaad1fddd7450a48ad464229775f97fbfe8af36
| Author: Mike Travis <travis@sgi.com>
| Date: Thu Dec 10 17:19:36 2009 -0800
|
| x86: Limit the number of processor bootup messages
removed the print_cpu_info() call from all APs.
Put it back - it will only print MSRs when the user
specifically requests them via show_msr=<cpus>.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Mike Travis <travis@sgi.com>
Link: http://lkml.kernel.org/r/1329069237-11483-1-git-send-email-yinghai@kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 14 | ||||
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 5 |
2 files changed, 10 insertions, 9 deletions
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index d43cad7..8b6a3bb 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -933,7 +933,7 @@ static const struct msr_range msr_range_array[] __cpuinitconst = { { 0xc0011000, 0xc001103b}, }; -static void __cpuinit print_cpu_msr(void) +static void __cpuinit __print_cpu_msr(void) { unsigned index_min, index_max; unsigned index; @@ -997,13 +997,13 @@ void __cpuinit print_cpu_info(struct cpuinfo_x86 *c) else printk(KERN_CONT "\n"); -#ifdef CONFIG_SMP + __print_cpu_msr(); +} + +void __cpuinit print_cpu_msr(struct cpuinfo_x86 *c) +{ if (c->cpu_index < show_msr) - print_cpu_msr(); -#else - if (show_msr) - print_cpu_msr(); -#endif + __print_cpu_msr(); } static __init int setup_disablecpuid(char *arg) diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 66d250c..257049d 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -791,9 +791,10 @@ do_rest: schedule(); } - if (cpumask_test_cpu(cpu, cpu_callin_mask)) + if (cpumask_test_cpu(cpu, cpu_callin_mask)) { + print_cpu_msr(&cpu_data(cpu)); pr_debug("CPU%d: has booted.\n", cpu); - else { + } else { boot_error = 1; if (*(volatile u32 *)TRAMPOLINE_SYM(trampoline_status) == 0xA5A5A5A5) |
