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x86/traps: Simplify pagefault tracing logic

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Make use of the new irqvector tracing static key and remove the duplicated
trace_do_pagefault() implementation.

If irq vector tracing is disabled, then the overhead of this is a single
NOP5, which is a reasonable tradeoff to avoid duplicated code and the
unholy macro mess.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20170828064956.672965407@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner
2017-08-28 08:47:22 +02:00
committed by Ingo Molnar
parent 2feb1b316d
commit 11a7ffb017
5 changed files with 16 additions and 66 deletions
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arch/x86/kernel/kvm.c
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@@ -263,7 +263,7 @@ do_async_page_fault(struct pt_regs *regs, unsigned long error_code)
switch (kvm_read_and_reset_pf_reason()) {
default:
trace_do_page_fault(regs, error_code);
do_page_fault(regs, error_code);
break;
case KVM_PV_REASON_PAGE_NOT_PRESENT:
/* page is swapped out by the host. */