linux-kernel - [PATCH] objtool: Fix STACK_FRAME_NON

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Message-ID: <20220429092024.GT2731@worktop.programming.kicks-ass.net>
Date:   Fri, 29 Apr 2022 11:20:24 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org, jpoimboe@...hat.com
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: [PATCH] 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 |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/include/linux/objtool.h
+++ b/include/linux/objtool.h
@@ -137,7 +137,11 @@ struct unwind_hint {
 
 .macro STACK_FRAME_NON_STANDARD func:req
 	.pushsection .discard.func_stack_frame_non_standard, "aw"
-		.long \func - .
+#ifdef CONFIG_64BIT
+		.quad \func
+#else
+		.long \func
+#endif
 	.popsection
 .endm