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[RFC,v5,48/57] arm64: sleep: Prevent stack frame warnings from objtool

Message ID 20200109160300.26150-49-jthierry@redhat.com (mailing list archive)
State New, archived
Headers show
Series objtool: Add support for arm64 | expand

Commit Message

Julien Thierry Jan. 9, 2020, 4:02 p.m. UTC
From: Raphael Gault <raphael.gault@arm.com>

This code doesn't respect the Arm PCS but it is intended this
way. Adapting it to respect the PCS would result in altering the

In order to suppress objtool's warnings, we setup a stack frame
for __cpu_suspend_enter and annotate cpu_resume and _cpu_resume
as having non-standard stack frames.

Signed-off-by: Raphael Gault <raphael.gault@arm.com>
Signed-off-by: Julien Thierry <jthierry@redhat.com>
 arch/arm64/kernel/sleep.S | 5 +++++
 1 file changed, 5 insertions(+)
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diff --git a/arch/arm64/kernel/sleep.S b/arch/arm64/kernel/sleep.S
index f5b04dd8a710..55c7c099d32c 100644
--- a/arch/arm64/kernel/sleep.S
+++ b/arch/arm64/kernel/sleep.S
@@ -1,5 +1,6 @@ 
 /* SPDX-License-Identifier: GPL-2.0 */
 #include <linux/errno.h>
+#include <linux/frame.h>
 #include <linux/linkage.h>
 #include <asm/asm-offsets.h>
 #include <asm/assembler.h>
@@ -90,6 +91,7 @@  ENTRY(__cpu_suspend_enter)
 	str	x0, [x1]
 	stp	x29, lr, [sp, #-16]!
+	mov	x29, sp
 	bl	cpu_do_suspend
 	ldp	x29, lr, [sp], #16
 	mov	x0, #1
@@ -146,3 +148,6 @@  ENTRY(_cpu_resume)
 	mov	x0, #0
+	asm_stack_frame_non_standard cpu_resume
+	asm_stack_frame_non_standard _cpu_resume