linux-kernel - [PATCH 6/6] objtool: Fix STACK_FRAME_NON

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Date:   Fri, 06 May 2022 14:14:37 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        jpoimboe@...hat.com, brgerst@...il.com, jiangshanlai@...il.com,
        Andrew.Cooper3@...rix.com, mark.rutland@....com
Subject: [PATCH 6/6] objtool: Fix STACK_FRAME_NON_STANDARD reloc type

STACK_FRAME_NON_STANDARD results in inconsistent relocation types
depending on .c or .S usage:

  Relocation section '.rela.discard.func_stack_frame_non_standard' at offset 0x3c01090 contains 5 entries:
  Offset             Info             Type               Symbol's Value  Symbol's Name + Addend
  0000000000000000  00020c2200000002 R_X86_64_PC32          0000000000047b40 do_suspend_lowlevel + 0
  0000000000000008  0002461e00000001 R_X86_64_64            00000000000480a0 machine_real_restart + 0
  0000000000000010  0000001400000001 R_X86_64_64            0000000000000000 .rodata + b3d4
  0000000000000018  0002444600000002 R_X86_64_PC32          00000000000678a0 __efi64_thunk + 0
  0000000000000020  0002659d00000001 R_X86_64_64            0000000000113160 __crash_kexec + 0

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 include/linux/objtool.h       |    4 +++-
 tools/include/linux/objtool.h |    4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

--- a/include/linux/objtool.h
+++ b/include/linux/objtool.h
@@ -2,6 +2,8 @@
 #ifndef _LINUX_OBJTOOL_H
 #define _LINUX_OBJTOOL_H
 
+#include <asm/asm.h>
+
 #ifndef __ASSEMBLY__
 
 #include <linux/types.h>
@@ -137,7 +139,7 @@ struct unwind_hint {
 
 .macro STACK_FRAME_NON_STANDARD func:req
 	.pushsection .discard.func_stack_frame_non_standard, "aw"
-		.long \func - .
+	_ASM_PTR \func
 	.popsection
 .endm
 
--- a/tools/include/linux/objtool.h
+++ b/tools/include/linux/objtool.h
@@ -2,6 +2,8 @@
 #ifndef _LINUX_OBJTOOL_H
 #define _LINUX_OBJTOOL_H
 
+#include <asm/asm.h>
+
 #ifndef __ASSEMBLY__
 
 #include <linux/types.h>
@@ -137,7 +139,7 @@ struct unwind_hint {
 
 .macro STACK_FRAME_NON_STANDARD func:req
 	.pushsection .discard.func_stack_frame_non_standard, "aw"
-		.long \func - .
+	_ASM_PTR \func
 	.popsection
 .endm