diff options
| author | Sean Paul <seanpaul@chromium.org> | 2018-03-30 18:35:45 +0200 |
|---|---|---|
| committer | Sean Paul <seanpaul@chromium.org> | 2018-03-30 18:35:45 +0200 |
| commit | 83fd26c3f32afe38bb2ab8cc00e313ec5c2edbce (patch) | |
| tree | b2d2719c998bc2bcba99f2ecf2d164ee9b7ad75a /arch/x86/kernel/traps.c | |
| parent | drm/i915: Make force_load_detect effective even w/ DMI quirks/hotplug (diff) | |
| parent | Merge branch 'drm-misc-next-fixes' of git://anongit.freedesktop.org/drm/drm-m... (diff) | |
| download | linux-83fd26c3f32afe38bb2ab8cc00e313ec5c2edbce.tar.xz linux-83fd26c3f32afe38bb2ab8cc00e313ec5c2edbce.zip | |
Merge airlied/drm-next into drm-misc-next
Backmerging to pick up a fix from drm-misc-next-fixes.
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Diffstat (limited to 'arch/x86/kernel/traps.c')
| -rw-r--r-- | arch/x86/kernel/traps.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 446c9ef8cfc3..03f3d7695dac 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -181,7 +181,7 @@ int fixup_bug(struct pt_regs *regs, int trapnr) break; case BUG_TRAP_TYPE_WARN: - regs->ip += LEN_UD0; + regs->ip += LEN_UD2; return 1; } @@ -577,7 +577,6 @@ do_general_protection(struct pt_regs *regs, long error_code) } NOKPROBE_SYMBOL(do_general_protection); -/* May run on IST stack. */ dotraplinkage void notrace do_int3(struct pt_regs *regs, long error_code) { #ifdef CONFIG_DYNAMIC_FTRACE @@ -592,6 +591,13 @@ dotraplinkage void notrace do_int3(struct pt_regs *regs, long error_code) if (poke_int3_handler(regs)) return; + /* + * Use ist_enter despite the fact that we don't use an IST stack. + * We can be called from a kprobe in non-CONTEXT_KERNEL kernel + * mode or even during context tracking state changes. + * + * This means that we can't schedule. That's okay. + */ ist_enter(regs); RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU"); #ifdef CONFIG_KGDB_LOW_LEVEL_TRAP @@ -609,15 +615,10 @@ dotraplinkage void notrace do_int3(struct pt_regs *regs, long error_code) SIGTRAP) == NOTIFY_STOP) goto exit; - /* - * Let others (NMI) know that the debug stack is in use - * as we may switch to the interrupt stack. - */ - debug_stack_usage_inc(); cond_local_irq_enable(regs); do_trap(X86_TRAP_BP, SIGTRAP, "int3", regs, error_code, NULL); cond_local_irq_disable(regs); - debug_stack_usage_dec(); + exit: ist_exit(regs); } |