From: "Andi Kleen" Allow a kernel debugger to hide single steps in more cases. Apparently helps the kgdb people. Signed-off-by: Andi Kleen Signed-off-by: Andrew Morton --- 25-akpm/arch/x86_64/kernel/traps.c | 4 +++- 25-akpm/include/asm-x86_64/kdebug.h | 1 + 2 files changed, 4 insertions(+), 1 deletion(-) diff -puN arch/x86_64/kernel/traps.c~x86_64-allow-a-kernel-debugger-to-hide-single-steps-in arch/x86_64/kernel/traps.c --- 25/arch/x86_64/kernel/traps.c~x86_64-allow-a-kernel-debugger-to-hide-single-steps-in 2004-11-28 01:54:37.113954928 -0800 +++ 25-akpm/arch/x86_64/kernel/traps.c 2004-11-28 01:54:37.118954168 -0800 @@ -691,7 +691,9 @@ asmlinkage void *do_debug(struct pt_regs tsk->thread.debugreg6 = condition; /* Mask out spurious TF errors due to lazy TF clearing */ - if (condition & DR_STEP) { + if ((condition & DR_STEP) && + (notify_die(DIE_DEBUGSTEP, "debugstep", regs, condition, + 1, SIGTRAP) != NOTIFY_STOP)) { /* * The TF error should be masked out only if the current * process is not traced and if the TRAP flag has been set diff -puN include/asm-x86_64/kdebug.h~x86_64-allow-a-kernel-debugger-to-hide-single-steps-in include/asm-x86_64/kdebug.h --- 25/include/asm-x86_64/kdebug.h~x86_64-allow-a-kernel-debugger-to-hide-single-steps-in 2004-11-28 01:54:37.114954776 -0800 +++ 25-akpm/include/asm-x86_64/kdebug.h 2004-11-28 01:54:37.118954168 -0800 @@ -23,6 +23,7 @@ enum die_val { DIE_OOPS = 1, DIE_INT3, DIE_DEBUG, + DIE_DEBUGSTEP, DIE_PANIC, DIE_NMI, DIE_DIE, _