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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@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Link: https://lkml.kernel.org/r/20200308222609.314596327@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-03-08 23:24:03 +01:00
parent 74a4882d72
commit 810f80a61b
2 changed files with 3 additions and 3 deletions
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2
arch/x86/entry/entry_32.S
View File

@ -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

4
arch/x86/entry/entry_64.S
View File

@ -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