From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753660AbaCFR6w (ORCPT ); Thu, 6 Mar 2014 12:58:52 -0500 Received: from mail-we0-f171.google.com ([74.125.82.171]:64419 "EHLO mail-we0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752903AbaCFR4s (ORCPT ); Thu, 6 Mar 2014 12:56:48 -0500 From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Ingo Molnar , Marcelo Tosatti , Peter Zijlstra , Thomas Gleixner Subject: [PATCH 1/6] cputime: Fix nsecs_to_cputime() return type cast Date: Thu, 6 Mar 2014 18:56:36 +0100 Message-Id: <1394128601-26034-2-git-send-email-fweisbec@gmail.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1394128601-26034-1-git-send-email-fweisbec@gmail.com> References: <1394128601-26034-1-git-send-email-fweisbec@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Even though nsec based cputime_t maps to u64, nsecs_to_cputime() must return a cputime_t value. We want to enforce this kind of cast in order to track down buggy manipulations of cputime_t such as direct access of its values under wrong assumptions on its backend type (nsecs, jiffies, etc...) by core code. Cc: Ingo Molnar Cc: Marcelo Tosatti Cc: Peter Zijlstra Cc: Thomas Gleixner Signed-off-by: Frederic Weisbecker --- include/asm-generic/cputime_nsecs.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/asm-generic/cputime_nsecs.h b/include/asm-generic/cputime_nsecs.h index 2c9e62c..768294f 100644 --- a/include/asm-generic/cputime_nsecs.h +++ b/include/asm-generic/cputime_nsecs.h @@ -44,7 +44,8 @@ typedef u64 __nocast cputime64_t; /* * Convert cputime <-> nanoseconds */ -#define nsecs_to_cputime(__nsecs) ((__force u64)(__nsecs)) +#define nsecs_to_cputime(__nsecs) \ + (__force cputime_t)(__nsecs) /* -- 1.8.3.1