linux-kernel - [tip:x86/asm] x86/asm: Fix UNWIND_HINT

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Date:   Thu, 10 Aug 2017 07:15:52 -0700
From:   tip-bot for Josh Poimboeuf <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     luto@...nel.org, dvlasenk@...hat.com,
        torvalds@...ux-foundation.org, jpoimboe@...hat.com, bp@...en8.de,
        akpm@...ux-foundation.org, brgerst@...il.com, mingo@...nel.org,
        linux-kernel@...r.kernel.org, peterz@...radead.org, hpa@...or.com,
        tglx@...utronix.de
Subject: [tip:x86/asm] x86/asm: Fix UNWIND_HINT_REGS macro for older
 binutils

Commit-ID:  af79ded44b7c5eee46b433a9269fcf899372225b
Gitweb:     http://git.kernel.org/tip/af79ded44b7c5eee46b433a9269fcf899372225b
Author:     Josh Poimboeuf <jpoimboe@...hat.com>
AuthorDate: Mon, 7 Aug 2017 09:38:05 -0500
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 10 Aug 2017 14:16:19 +0200

x86/asm: Fix UNWIND_HINT_REGS macro for older binutils

Apparently the binutils 2.20 assembler can't handle the '&&' operator in
the UNWIND_HINT_REGS macro.  Rearrange the macro to do without it.

This fixes the following error:

  arch/x86/entry/entry_64.S: Assembler messages:
  arch/x86/entry/entry_64.S:521: Error: non-constant expression in ".if" statement
  arch/x86/entry/entry_64.S:521: Error: non-constant expression in ".if" statement
  arch/x86/entry/entry_64.S:521: Error: non-constant expression in ".if" statement
  arch/x86/entry/entry_64.S:521: Error: non-constant expression in ".if" statement
  arch/x86/entry/entry_64.S:521: Error: non-constant expression in ".if" statement
  arch/x86/entry/entry_64.S:521: Error: non-constant expression in ".if" statement
  arch/x86/entry/entry_64.S:521: Error: non-constant expression in ".if" statement
  arch/x86/entry/entry_64.S:521: Error: non-constant expression in ".if" statement
  arch/x86/entry/entry_64.S:521: Error: non-constant expression in ".if" statement

Reported-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Fixes: 39358a033b2e ("objtool, x86: Add facility for asm code to provide unwind hints")
Link: http://lkml.kernel.org/r/e2ad97c1ae49a484644b4aaa4dd3faa4d6d969b2.1502116651.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/unwind_hints.h | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/unwind_hints.h b/arch/x86/include/asm/unwind_hints.h
index 5e02b11..bae46fc 100644
--- a/arch/x86/include/asm/unwind_hints.h
+++ b/arch/x86/include/asm/unwind_hints.h
@@ -44,10 +44,12 @@
 .endm
 
 .macro UNWIND_HINT_REGS base=%rsp offset=0 indirect=0 extra=1 iret=0
-	.if \base == %rsp && \indirect
-		.set sp_reg, ORC_REG_SP_INDIRECT
-	.elseif \base == %rsp
-		.set sp_reg, ORC_REG_SP
+	.if \base == %rsp
+		.if \indirect
+			.set sp_reg, ORC_REG_SP_INDIRECT
+		.else
+			.set sp_reg, ORC_REG_SP
+		.endif
 	.elseif \base == %rbp
 		.set sp_reg, ORC_REG_BP
 	.elseif \base == %rdi