x86/entry/64: Fix unwind hints in rewind_stack_do_exit()

The LEAQ instruction in rewind_stack_do_exit() moves the stack pointer directly below the pt_regs at the top of the task stack before calling do_exit(). Tell the unwinder to expect pt_regs. Fixes: 8c1f755 ("x86/entry/64: Add unwind hint annotations") Reviewed-by: Miroslav Benes <[email protected]> Signed-off-by: Jann Horn <[email protected]> Signed-off-by: Josh Poimboeuf <[email protected]> Signed-off-by: Ingo Molnar <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Dave Jones <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Vince Weaver <[email protected]> Link: https://lore.kernel.org/r/68c33e17ae5963854916a46f522624f8e1d264f2.1587808742.git.jpoimboe@redhat.com
sudhin-joseph · Apr 25, 2020 · f977df7 · f977df7
1 parent 96c6480
commit f977df7
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
@@ -1739,7 +1739,7 @@ SYM_CODE_START(rewind_stack_do_exit)
 
 	movq	PER_CPU_VAR(cpu_current_top_of_stack), %rax
 	leaq	-PTREGS_SIZE(%rax), %rsp
-	UNWIND_HINT_FUNC sp_offset=PTREGS_SIZE
+	UNWIND_HINT_REGS
 
 	call	do_exit
 SYM_CODE_END(rewind_stack_do_exit)