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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-02 16:25:06 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-02 16:25:06 -0700 |
| commit | 55a0d3ff603a69ea4ec7677effd457f838390afc (patch) | |
| tree | 9042a07bea162389678f6660831d312d5d82f0cc /arch/x86/kernel/process_64.c | |
| parent | 35c23d5d797629a83389bf5dccc5e4a7fb477504 (diff) | |
| parent | 13bfd47a0ef68fc8b21e67873dbdf269c7db6b59 (diff) | |
Merge branch 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 debug update from Ingo Molnar:
"Misc debuggability improvements:
- Optimize the x86 CPU register printout a bit
- Expose the tboot TXT log via debugfs
- Small do_debug() cleanup"
* 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/tboot: Provide debugfs interfaces to access TXT log
x86: Remove weird PTR_ERR() in do_debug
x86/debug: Only print out DR registers if they are not power-on defaults
Diffstat (limited to 'arch/x86/kernel/process_64.c')
| -rw-r--r-- | arch/x86/kernel/process_64.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index f99a242730e9..05646bab4ca6 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -105,11 +105,18 @@ void __show_regs(struct pt_regs *regs, int all) get_debugreg(d0, 0); get_debugreg(d1, 1); get_debugreg(d2, 2); - printk(KERN_DEFAULT "DR0: %016lx DR1: %016lx DR2: %016lx\n", d0, d1, d2); get_debugreg(d3, 3); get_debugreg(d6, 6); get_debugreg(d7, 7); + + /* Only print out debug registers if they are in their non-default state. */ + if ((d0 == 0) && (d1 == 0) && (d2 == 0) && (d3 == 0) && + (d6 == DR6_RESERVED) && (d7 == 0x400)) + return; + + printk(KERN_DEFAULT "DR0: %016lx DR1: %016lx DR2: %016lx\n", d0, d1, d2); printk(KERN_DEFAULT "DR3: %016lx DR6: %016lx DR7: %016lx\n", d3, d6, d7); + } void release_thread(struct task_struct *dead_task) |