From patchwork Wed May 6 16:30:11 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 6577 Received: (qmail 70192 invoked by alias); 6 May 2015 16:30:41 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Delivered-To: mailing list libc-alpha@sourceware.org Received: (qmail 70179 invoked by uid 89); 6 May 2015 16:30:40 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.4 required=5.0 tests=AWL, BAYES_00, KAM_LAZY_DOMAIN_SECURITY, RCVD_IN_DNSWL_NONE autolearn=no version=3.3.2 X-HELO: mout.kundenserver.de From: Arnd Bergmann To: y2038@lists.linaro.org Cc: baolin.wang@linaro.org, tglx@linutronix.de, albert.aribaud@3adev.fr, john.stultz@linaro.org, bamvor.zhangjian@linaro.org, ruchandani.tina@gmail.com, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, libc-alpha@sourceware.org, Arnd Bergmann Subject: [PATCH 04/19] y2038: introduce CONFIG_COMPAT_TIME Date: Wed, 6 May 2015 18:30:11 +0200 Message-Id: <1430929826-318934-5-git-send-email-arnd@arndb.de> In-Reply-To: <1430929826-318934-1-git-send-email-arnd@arndb.de> References: <1430929826-318934-1-git-send-email-arnd@arndb.de> X-UI-Out-Filterresults: notjunk:1; There are a total of system calls (aside from ioctl) that pass a time_t or derived data structure as an argument, and in order to extend time_t to 64-bit, we have to replace them with new system calls and keep providing backwards compatibility. To avoid adding completely new and untested code for this purpose, we introduce a new CONFIG_COMPAT_TIME symbol that is always set on 64-bit architectures with 32-bit compat mode, as well as all 32-bit architectures that have been extended to provide the new system calls. After this is done for all architectures, the CONFIG_COMPAT_TIME symbol can be made a user-selected option, to enable users to build a kernel that only provides y2038-safe system calls. Signed-off-by: Arnd Bergmann --- arch/Kconfig | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/Kconfig b/arch/Kconfig index a65eafb24997..630d3d289569 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -545,4 +545,15 @@ config OLD_SIGACTION config COMPAT_OLD_SIGACTION bool +config ARCH_HAS_COMPAT_TIME + def_bool COMPAT + +config COMPAT_TIME + def_bool ARCH_HAS_COMPAT_TIME + help + This should be selected by all architectures that need to support + system calls with a 32-bit time_t. Traditionally, this has been + used on all 32-bit architectures, and needs to be supported on + 64-bit architectures as part of compat syscall handling. + source "kernel/gcov/Kconfig"