It's kernel policy to not have (unannotated) indirect jumps because of
Spectre v2. This one's probably harmless, but better safe than sorry.
Convert it to a retpoline.
Cc: "Rafael J. Wysocki" <r...@rjwysocki.net>
Cc: Len Brown <len.br...@intel.com>
Cc: Pavel Machek <pa...@ucw.cz>
Signed-off-by: Josh Poimboeuf <jpoim...@redhat.com>
---
arch/x86/kernel/acpi/wakeup_64.S | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S
index 5d3a0b8fd379..0b371580e620 100644
--- a/arch/x86/kernel/acpi/wakeup_64.S
+++ b/arch/x86/kernel/acpi/wakeup_64.S
@@ -7,6 +7,7 @@
#include <asm/msr.h>
#include <asm/asm-offsets.h>
#include <asm/frame.h>
+#include <asm/nospec-branch.h>
# Copyright 2003 Pavel Machek <pa...@suse.cz
@@ -39,7 +40,7 @@ SYM_FUNC_START(wakeup_long64)
movq saved_rbp, %rbp
movq saved_rip, %rax
- jmp *%rax
+ JMP_NOSPEC rax
SYM_FUNC_END(wakeup_long64)
SYM_FUNC_START(do_suspend_lowlevel)
--
2.29.2
