linux-kernel - [PATCH RESEND] ARM: Add unwinding annotations to _

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Message-ID: <20211223025658.3768629-1-xukuohai@huawei.com>
Date:   Thu, 23 Dec 2021 02:56:58 +0000
From:   Xu Kuohai <xukuohai@...wei.com>
To:     <linux-arm-kernel@...ts.infradead.org>, <linux@...linux.org.uk>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH RESEND] ARM: Add unwinding annotations to __loop.*delay functions

The unwind directives can't handle nested function entries, so only the
outermost function __loop_udelay is annotated, and the inner nested
entries share the same unwind info with __loop_udelay.

Signed-off-by: Xu Kuohai <xukuohai@...wei.com>
---
 arch/arm/lib/delay-loop.S | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/arm/lib/delay-loop.S b/arch/arm/lib/delay-loop.S
index 3ccade0f8130..f0a076f9abc5 100644
--- a/arch/arm/lib/delay-loop.S
+++ b/arch/arm/lib/delay-loop.S
@@ -7,6 +7,7 @@
 #include <linux/linkage.h>
 #include <asm/assembler.h>
 #include <asm/delay.h>
+#include <asm/unwind.h>
 
 		.text
 
@@ -21,6 +22,7 @@
  */
 
 ENTRY(__loop_udelay)
+UNWIND(.fnstart)
 		ldr	r2, .LC1
 		mul	r0, r2, r0		@ r0 = delay_us * UDELAY_MULT
 ENTRY(__loop_const_udelay)			@ 0 <= r0 <= 0xfffffaf0
@@ -54,6 +56,7 @@ ENTRY(__loop_delay)
 #endif
 		bhi	__loop_delay
 		ret	lr
-ENDPROC(__loop_udelay)
-ENDPROC(__loop_const_udelay)
 ENDPROC(__loop_delay)
+ENDPROC(__loop_const_udelay)
+UNWIND(.fnend)
+ENDPROC(__loop_udelay)
-- 
2.27.0