diff options
Diffstat (limited to 'arch/x86/kernel/traps.c')
| -rw-r--r-- | arch/x86/kernel/traps.c | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 9cb39d30413d..58bc434c75de 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -783,25 +783,18 @@ static __always_inline unsigned long debug_read_clear_dr6(void) * * May run on IST stack. */ -static void handle_debug(struct pt_regs *regs, unsigned long dr6, bool user) +static void handle_debug(struct pt_regs *regs, unsigned long dr6) { struct task_struct *tsk = current; bool user_icebp; int si_code; /* - * If DR6 is zero, no point in trying to handle it. The kernel is - * not using INT1. - */ - if (!user && !dr6) - return; - - /* * If dr6 has no reason to give us about the origin of this trap, * then it's very likely the result of an icebp/int01 trap. * User wants a sigtrap for that. */ - user_icebp = user && !dr6; + user_icebp = !dr6; /* Store the virtualized DR6 value */ tsk->thread.debugreg6 = dr6; @@ -874,7 +867,13 @@ static __always_inline void exc_debug_kernel(struct pt_regs *regs, if (kprobe_debug_handler(regs)) goto out; - handle_debug(regs, dr6, false); + /* + * The kernel doesn't use INT1 + */ + if (!dr6) + goto out; + + handle_debug(regs, dr6); out: instrumentation_end(); @@ -904,7 +903,7 @@ static __always_inline void exc_debug_user(struct pt_regs *regs, irqentry_enter_from_user_mode(regs); instrumentation_begin(); - handle_debug(regs, dr6, true); + handle_debug(regs, dr6); instrumentation_end(); irqentry_exit_to_user_mode(regs); |