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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-06-03 13:37:03 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-06-05 10:28:58 +0200
commit10d15c48ad691581a2d5c0f07943724c57bef46f (patch)
tree311f57527b5ad088271ed84b4780a4457019b797
parent269e5906328a6606c893caa8451ecd5b672b0733 (diff)
x86/xen: Add unwind hint annotations to xen_setup_gdt
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>
-rw-r--r--arch/x86/xen/enlighten.c5
1 files changed, 4 insertions, 1 deletions
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));