linux-kernel - [PATCH 3.2 120/140] m32r: fix 'fix breakage from "m32r: use generic ptrace

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Date:   Wed, 28 Feb 2018 15:20:22 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Hirokazu Takata" <takata@...ux-m32r.org>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Christoph Hellwig" <hch@....de>,
        "Geert Uytterhoeven" <geert@...ux-m68k.org>,
        "Al Viro" <viro@...iv.linux.org.uk>
Subject: [PATCH 3.2 120/140] m32r: fix 'fix breakage from "m32r: use
 generic ptrace_resume code"' fallout

3.2.100-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Geert Uytterhoeven <geert@...ux-m68k.org>

commit a6b202979661eb32646048aeaad7be7b70c2cd22 upstream.

Commit acdc0d5ef9dd ('m32r: fix breakage from "m32r: use generic
ptrace_resume code"') tried to fix a problem in commit e34112e3966fc
("m32r: use generic ptrace_resume code") by returning values in a
function returning void, causing:

  arch/m32r/kernel/ptrace.c: In function 'user_enable_single_step':
  arch/m32r/kernel/ptrace.c:594:3: warning: 'return' with a value, in function returning void [enabled by default]
  arch/m32r/kernel/ptrace.c:598:3: warning: 'return' with a value, in function returning void [enabled by default]
  arch/m32r/kernel/ptrace.c:601:3: warning: 'return' with a value, in function returning void [enabled by default]
  arch/m32r/kernel/ptrace.c:604:2: warning: 'return' with a value, in function returning void [enabled by default]

Remove the unneeded return values.

Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Christoph Hellwig <hch@....de>
Cc: Hirokazu Takata <takata@...ux-m32r.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/m32r/kernel/ptrace.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/arch/m32r/kernel/ptrace.c
+++ b/arch/m32r/kernel/ptrace.c
@@ -592,17 +592,16 @@ void user_enable_single_step(struct task
 
 	if (access_process_vm(child, pc&~3, &insn, sizeof(insn), 0)
 	    != sizeof(insn))
-		return -EIO;
+		return;
 
 	compute_next_pc(insn, pc, &next_pc, child);
 	if (next_pc & 0x80000000)
-		return -EIO;
+		return;
 
 	if (embed_debug_trap(child, next_pc))
-		return -EIO;
+		return;
 
 	invalidate_cache();
-	return 0;
 }
 
 void user_disable_single_step(struct task_struct *child)