linux-kernel - [PATCH] objtool/x86: Replace Non-standard Range Expression in Case

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Message-Id: <20180216143924.9918-1-progyanb@acm.org>
Date:   Fri, 16 Feb 2018 20:09:24 +0530
From:   Progyan Bhattacharya <bprogyan@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Nick Desaulniers <nick.desaulniers@...il.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Nicholas Mc Guire <der.herr@...r.at>
Subject: [PATCH] objtool/x86: Replace Non-standard Range Expression in Case

Replace range expressions with seperate individual cases, i.e. convert case 1...3: to case 1: case 2: case 3
Range expression within case statements are non-standard C code and can create issues over compiler and platform variety.

While compiling with gcc 4.8 (RHEL) I encountered this error on range expression in case statements:
error: range expressions in switch statements are non-standard [-Werror=pedantic]

Signed-off-by: Progyan Bhattacharya <progyanb@....org>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Nick Desaulniers <nick.desaulniers@...il.com>
Cc: Lukas Bulwahn <lukas.bulwahn@...il.com>
Cc: Nicholas Mc Guire <der.herr@...r.at>
Cc: linux-kernel@...r.kernel.org
---
 tools/objtool/arch/x86/decode.c | 35 ++++++++++++++++++++++++++++++++---
 1 file changed, 32 insertions(+), 3 deletions(-)

diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c
index 540a209b78ab..e6803dd79958 100644
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -143,7 +143,14 @@ int arch_decode_instruction(struct elf *elf, struct section *sec,
 		}
 		break;
 
-	case 0x50 ... 0x57:
+	case 0x50:
+	case 0x51:
+	case 0x52:
+	case 0x53:
+	case 0x54:
+	case 0x55:
+	case 0x56:
+	case 0x57:
 
 		/* push reg */
 		*type = INSN_STACK;
@@ -153,7 +160,14 @@ int arch_decode_instruction(struct elf *elf, struct section *sec,
 
 		break;
 
-	case 0x58 ... 0x5f:
+	case 0x58:
+	case 0x59:
+	case 0x5a:
+	case 0x5b:
+	case 0x5c:
+	case 0x5d:
+	case 0x5e:
+	case 0x5f:
 
 		/* pop reg */
 		*type = INSN_STACK;
@@ -171,7 +185,22 @@ int arch_decode_instruction(struct elf *elf, struct section *sec,
 		op->dest.type = OP_DEST_PUSH;
 		break;
 
-	case 0x70 ... 0x7f:
+	case 0x70:
+	case 0x71:
+	case 0x72:
+	case 0x73:
+	case 0x74:
+	case 0x75:
+	case 0x76:
+	case 0x77:
+	case 0x78:
+	case 0x79:
+	case 0x7a:
+	case 0x7b:
+	case 0x7c:
+	case 0x7d:
+	case 0x7e:
+	case 0x7f:
 		*type = INSN_JUMP_CONDITIONAL;
 		break;
 
-- 
Regards,
Progyan Bhattacharya
http://codeprogyan.me
2.16.1