Not needed in mainline as this function got rewritten in 4.12
This enables objtool to grok the iret in the middle of a C function.
This matches commit 76846bf3cb09 ("x86/asm: Add unwind hint annotations to sync_core()")
Cc: Josh Poimboeuf jpoimboe@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/xen/enlighten.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 081437b5f381..e3a3f5a64884 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -75,6 +75,7 @@ #include <asm/mwait.h> #include <asm/pci_x86.h> #include <asm/cpu.h> +#include <asm/unwind_hints.h>
#ifdef CONFIG_ACPI #include <linux/acpi.h> @@ -1452,10 +1453,12 @@ static void __ref xen_setup_gdt(int cpu) * GDT. The new GDT has __KERNEL_CS with CS.L = 1 * and we are jumping to reload it. */ - asm volatile ("pushq %0\n" + asm volatile (UNWIND_HINT_SAVE + "pushq %0\n" "leaq 1f(%%rip),%0\n" "pushq %0\n" "lretq\n" + UNWIND_HINT_RESTORE "1:\n" : "=&r" (dummy) : "0" (__KERNEL_CS));