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 behaviour.
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 <[email protected]> --- arch/arm64/kernel/sleep.S | 5 +++++ 1 file changed, 5 insertions(+) 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] add x0, x0, #SLEEP_STACK_DATA_SYSTEM_REGS 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 ret ENDPROC(_cpu_resume) + + asm_stack_frame_non_standard cpu_resume + asm_stack_frame_non_standard _cpu_resume -- 2.17.1
