x86, 64-bit, dwarf2: push pushes 8 bytes and popf pops 8

The CFI_ADJUST_CFA_OFFSET dwarf2 annotation of a push/popf
pair in ret_from_fork wrongly used a value of 4. It should
have been 8. Fix that.

Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: heukelum@fastmail.fm
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 89434d439605484b48a7b26ba31c55e82c9821c5..cf3a0b2d00599adb2a79fefa991c0d8223059fba 100644 (file)
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -275,9 +275,9 @@ ENTRY(native_usergs_sysret64)
 ENTRY(ret_from_fork)
        CFI_DEFAULT_STACK
        push kernel_eflags(%rip)
-       CFI_ADJUST_CFA_OFFSET 4
+       CFI_ADJUST_CFA_OFFSET 8
        popf                            # reset kernel eflags
-       CFI_ADJUST_CFA_OFFSET -4
+       CFI_ADJUST_CFA_OFFSET -8
        call schedule_tail
        GET_THREAD_INFO(%rcx)
        testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),TI_flags(%rcx)