From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966267AbdDSQXs (ORCPT ); Wed, 19 Apr 2017 12:23:48 -0400 Received: from merlin.infradead.org ([205.233.59.134]:33106 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965758AbdDSQRu (ORCPT ); Wed, 19 Apr 2017 12:17:50 -0400 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Arnaldo Carvalho de Melo , Adrian Hunter , David Ahern , Jiri Olsa , Namhyung Kim , Wang Nan Subject: [PATCH 04/28] tools include: Adopt __same_type() and __must_be_array() from the kernel Date: Wed, 19 Apr 2017 13:16:59 -0300 Message-Id: <20170419161723.21011-5-acme@kernel.org> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170419161723.21011-1-acme@kernel.org> References: <20170419161723.21011-1-acme@kernel.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arnaldo Carvalho de Melo Will be used to adopt the more stringent version of ARRAY_SIZE(), the one in the kernel sources. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-d85dpvay1hoqscpezlntyd8x@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/include/linux/compiler-gcc.h | 3 +++ tools/include/linux/compiler.h | 5 +++++ 2 files changed, 8 insertions(+) diff --git a/tools/include/linux/compiler-gcc.h b/tools/include/linux/compiler-gcc.h index 616935f1ff56..825d44f89a29 100644 --- a/tools/include/linux/compiler-gcc.h +++ b/tools/include/linux/compiler-gcc.h @@ -16,3 +16,6 @@ #if GCC_VERSION >= 40300 # define __compiletime_error(message) __attribute__((error(message))) #endif /* GCC_VERSION >= 40300 */ + +/* &a[0] degrades to a pointer: a different type from an array */ +#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0])) diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h index c9e65e8faacd..23299d7e7160 100644 --- a/tools/include/linux/compiler.h +++ b/tools/include/linux/compiler.h @@ -17,6 +17,11 @@ # define __always_inline inline __attribute__((always_inline)) #endif +/* Are two types/vars the same type (ignoring qualifiers)? */ +#ifndef __same_type +# define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) +#endif + #ifdef __ANDROID__ /* * FIXME: Big hammer to get rid of tons of: -- 2.9.3