From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754072AbbIQJTJ (ORCPT ); Thu, 17 Sep 2015 05:19:09 -0400 Received: from mail-wi0-f175.google.com ([209.85.212.175]:34913 "EHLO mail-wi0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753665AbbIQJTH (ORCPT ); Thu, 17 Sep 2015 05:19:07 -0400 From: Peter Senna Tschudin To: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, anton@samba.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: Peter Senna Tschudin Subject: [PATCH] arch-powerpc: Return false instead of -EFAULT Date: Thu, 17 Sep 2015 11:18:56 +0200 Message-Id: <1442481536-11088-1-git-send-email-peter.senna@gmail.com> X-Mailer: git-send-email 2.1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Returning a negative value for a boolean function seem to have the undesired effect of returning true. Replace -EINVAL by false in a bool-returning function. The diff of the .s file before and after the change (using cross compilation) starts with: 440,441c440,441 < .L43: < li 3,1 # D.25775, --- > .L42: > li 3,0 # D.25775, ... while if -EFAULT is replaced by true, the diff is empty. There is only one call site, and it expects a boolean value: arch/powerpc/kernel/ftrace.c:129: if (!is_module_trampoline(tramp)) { pr_err("Not a trampoline\n"); return -EINVAL; } This issue was found by the following Coccinelle semantic patch: @@ identifier f; constant C; typedef bool; @@ bool f (...){ <+... * return -C; ...+> } Signed-off-by: Peter Senna Tschudin --- arch/powerpc/kernel/module_64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c index 6838451..a94a5f1 100644 --- a/arch/powerpc/kernel/module_64.c +++ b/arch/powerpc/kernel/module_64.c @@ -160,7 +160,7 @@ bool is_module_trampoline(u32 *p) BUILD_BUG_ON(sizeof(ppc64_stub_insns) != sizeof(ppc64_stub_mask)); if (probe_kernel_read(insns, p, sizeof(insns))) - return -EFAULT; + return false; for (i = 0; i < ARRAY_SIZE(ppc64_stub_insns); i++) { u32 insna = insns[i]; -- 2.1.0