• Daniel Bristot de Oliveira's avatar
    x86/irq, trace: Add __irq_entry annotation to x86's platform IRQ handlers · c4158ff5
    Daniel Bristot de Oliveira authored
    This patch adds the __irq_entry annotation to the default x86
    platform IRQ handlers. ftrace's function_graph tracer uses the
    __irq_entry annotation to notify the entry and return of IRQ
    handlers.
    
    For example, before the patch:
      354549.667252 |   3)  d..1              |  default_idle_call() {
      354549.667252 |   3)  d..1              |    arch_cpu_idle() {
      354549.667253 |   3)  d..1              |      default_idle() {
      354549.696886 |   3)  d..1              |        smp_trace_reschedule_interrupt() {
      354549.696886 |   3)  d..1              |          irq_enter() {
      354549.696886 |   3)  d..1              |            rcu_irq_enter() {
    
    After the patch:
      366416.254476 |   3)  d..1              |    arch_cpu_idle() {
      366416.254476 |   3)  d..1              |      default_idle() {
      366416.261566 |   3)  d..1  ==========> |
      366416.261566 |   3)  d..1              |        smp_trace_reschedule_interrupt() {
      366416.261566 |   3)  d..1              |          irq_enter() {
      366416.261566 |   3)  d..1              |            rcu_irq_enter() {
    
    KASAN also uses this annotation. The smp_apic_timer_interrupt()
    was already annotated.
    Signed-off-by: default avatarDaniel Bristot de Oliveira <bristot@redhat.com>
    Acked-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
    Cc: Aaron Lu <aaron.lu@intel.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Baoquan He <bhe@redhat.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Claudio Fontana <claudio.fontana@huawei.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: Dou Liyang <douly.fnst@cn.fujitsu.com>
    Cc: Gu Zheng <guz.fnst@cn.fujitsu.com>
    Cc: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Nicolai Stange <nicstange@gmail.com>
    Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Tony Luck <tony.luck@intel.com>
    Cc: Wanpeng Li <wanpeng.li@hotmail.com>
    Cc: linux-edac@vger.kernel.org
    Link: http://lkml.kernel.org/r/059fdf437c2f0c09b13c18c8fe4e69999d3ffe69.1483528431.git.bristot@redhat.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    c4158ff5
threshold.c 925 Bytes