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Commit 6669a692 authored by Andy Lutomirski's avatar Andy Lutomirski Committed by Ingo Molnar
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x86/irq: Remove an old outdated comment about context tracking races 



That race has been fixed and code cleaned up for a while now.

Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarBorislav Petkov <bp@suse.de>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Laight <David.Laight@aculab.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Eduardo Valentin <eduval@amazon.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: aliguori@amazon.com
Cc: daniel.gruss@iaik.tugraz.at
Cc: hughd@google.com
Cc: keescook@google.com
Link: https://lkml.kernel.org/r/20171204150605.150551639@linutronix.de


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent b02fcf9b

arch/x86/kernel/irq.c

+0 −12
Original line number Diff line number Diff line
@@ -219,18 +219,6 @@ __visible unsigned int __irq_entry do_IRQ(struct pt_regs *regs) 
	/* high bit used in ret_from_ code  */

	unsigned vector = ~regs->orig_ax;



	/*

	 * NB: Unlike exception entries, IRQ entries do not reliably

	 * handle context tracking in the low-level entry code.  This is

	 * because syscall entries execute briefly with IRQs on before

	 * updating context tracking state, so we can take an IRQ from

	 * kernel mode with CONTEXT_USER.  The low-level entry code only

	 * updates the context if we came from user mode, so we won't

	 * switch to CONTEXT_KERNEL.  We'll fix that once the syscall

	 * code is cleaned up enough that we can cleanly defer enabling

	 * IRQs.

	 */



	entering_irq();



	/* entering_irq() tells RCU that we're not quiescent.  Check it. */