4.14-stable review patch. If anyone has any objections, please let me know.
------------------
This reverts commit f9a64e23a9da528e7d8aa1bd2c7bb92be4ebb724 which is
commit 0d794d0d018f23fb09c50f6ae26868bd6ae343d6 upstream.
Andy writes:
I think the thing to do is to revert the patch from -stable.
The bug it fixes is very minor, and the regression is that it
made a pre-existing bug in some nearly-undebuggable core resume
code much easier to hit. I don't feel comfortable with a
backport of the latter fix until it has a good long soak in
Linus' tree.
Reported-by: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/entry/entry_64.S | 10 ++--------
1 file changed, 2 insertions(+), 8 deletions(-)
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -51,19 +51,15 @@ ENTRY(native_usergs_sysret64)
END(native_usergs_sysret64)
#endif /* CONFIG_PARAVIRT */
-.macro TRACE_IRQS_FLAGS flags:req
+.macro TRACE_IRQS_IRETQ
#ifdef CONFIG_TRACE_IRQFLAGS
- bt $9, \flags /* interrupts off? */
+ bt $9, EFLAGS(%rsp) /* interrupts off? */
jnc 1f
TRACE_IRQS_ON
1:
#endif
.endm
-.macro TRACE_IRQS_IRETQ
- TRACE_IRQS_FLAGS EFLAGS(%rsp)
-.endm
-
/*
* When dynamic function tracer is enabled it will add a breakpoint
* to all locations that it is about to modify, sync CPUs, update
@@ -927,13 +923,11 @@ ENTRY(native_load_gs_index)
FRAME_BEGIN
pushfq
DISABLE_INTERRUPTS(CLBR_ANY & ~CLBR_RDI)
- TRACE_IRQS_OFF
SWAPGS
.Lgs_change:
movl %edi, %gs
2: ALTERNATIVE "", "mfence", X86_BUG_SWAPGS_FENCE
SWAPGS
- TRACE_IRQS_FLAGS (%rsp)
popfq
FRAME_END
ret
