linux-kernel - [PATCH v2 05/10] arch: Introduce CONFIG_COMPAT_32BIT

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Message-Id: <20171127193037.8711-6-deepa.kernel@gmail.com>
Date:   Mon, 27 Nov 2017 11:30:32 -0800
From:   Deepa Dinamani <deepa.kernel@...il.com>
To:     tglx@...utronix.de, john.stultz@...aro.org
Cc:     linux-kernel@...r.kernel.org, arnd@...db.de, y2038@...ts.linaro.org
Subject: [PATCH v2 05/10] arch: Introduce CONFIG_COMPAT_32BIT_TIME

Compat functions are now used to support 32 bit time_t in
compat mode on 64 bit architectures and in native mode on
32 bit architectures.

Introduce COMPAT_32BIT_TIME to conditionally compile these
functions.

Note that turning off 32 bit time_t support requires more
changes on architecture side. For instance, architecure
syscall tables need to be updated to drop support for 32 bit
time_t syscalls.

Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
---
 arch/Kconfig | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/Kconfig b/arch/Kconfig
index 11810c29c1fa..e75c5239c885 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -884,6 +884,13 @@ config 64BIT_TIME
 	  architectures, and 64-bit architectures as part of compat syscall
 	  handling.
 
+config COMPAT_32BIT_TIME
+	def_bool (!64BIT && 64BIT_TIME) || COMPAT
+	help
+	  This enables 32 bit time_t support in addition to 64 bit time_t support.
+	  This is relevant on all 32-bit architectures, and 64-bit architectures
+	  as part of compat syscall handling.
+
 config ARCH_NO_COHERENT_DMA_MMAP
 	bool
 
-- 
2.14.1