linux-kernel - [PATCH 04/19] y2038: introduce CONFIG_COMPAT

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Message-Id: <1430929826-318934-5-git-send-email-arnd@arndb.de>
Date:	Wed,  6 May 2015 18:30:11 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	y2038@...ts.linaro.org
Cc:	baolin.wang@...aro.org, tglx@...utronix.de,
	albert.aribaud@...ev.fr, john.stultz@...aro.org,
	bamvor.zhangjian@...aro.org, ruchandani.tina@...il.com,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	libc-alpha@...rceware.org, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 04/19] y2038: introduce CONFIG_COMPAT_TIME

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 <arnd@...db.de>
---
 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"
-- 
2.1.0.rc2

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