linux-kernel - [tip: x86/entry] x86/entry/64: Trace irqflags unconditionally as ON when returning to user space

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Message-ID: <158384533691.28353.9671125002002974218.tip-bot2@tip-bot2>
Date:   Tue, 10 Mar 2020 13:02:16 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/entry] x86/entry/64: Trace irqflags unconditionally as ON
 when returning to user space

The following commit has been merged into the x86/entry branch of tip:

Commit-ID:     810f80a61be8c1d4a574082737f7a18c7459fa7b
Gitweb:        https://git.kernel.org/tip/810f80a61be8c1d4a574082737f7a18c7459fa7b
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Sun, 08 Mar 2020 23:24:03 +01:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Tue, 10 Mar 2020 13:56:32 +01:00

x86/entry/64: Trace irqflags unconditionally as ON when returning to user space

User space cannot disable interrupts any longer so trace return to user space
unconditionally as IRQS_ON.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@...cle.com>
Link: https://lkml.kernel.org/r/20200308222609.314596327@linutronix.de
---
 arch/x86/entry/entry_32.S | 2 +-
 arch/x86/entry/entry_64.S | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 80df781..b67bae7 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1088,7 +1088,7 @@ SYM_FUNC_START(entry_INT80_32)
 	STACKLEAK_ERASE
 
 restore_all:
-	TRACE_IRQS_IRET
+	TRACE_IRQS_ON
 	SWITCH_TO_ENTRY_STACK
 	CHECK_AND_APPLY_ESPFIX
 
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index f2bb91e..0e9504f 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -174,7 +174,7 @@ SYM_INNER_LABEL(entry_SYSCALL_64_after_hwframe, SYM_L_GLOBAL)
 	movq	%rsp, %rsi
 	call	do_syscall_64		/* returns with IRQs disabled */
 
-	TRACE_IRQS_IRETQ		/* we're about to change IF */
+	TRACE_IRQS_ON			/* return enables interrupts */
 
 	/*
 	 * Try to use SYSRET instead of IRET if we're returning to
@@ -619,7 +619,7 @@ ret_from_intr:
 .Lretint_user:
 	mov	%rsp,%rdi
 	call	prepare_exit_to_usermode
-	TRACE_IRQS_IRETQ
+	TRACE_IRQS_ON
 
 SYM_INNER_LABEL(swapgs_restore_regs_and_return_to_usermode, SYM_L_GLOBAL)
 #ifdef CONFIG_DEBUG_ENTRY