[tip:timers/core] time: Introduce CONFIG_COMPAT_32BIT_TIME

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Commit-ID:  17435e5f8cf3ba8b3df1aa662f9921f0ccdd8a28
Gitweb:     https://git.kernel.org/tip/17435e5f8cf3ba8b3df1aa662f9921f0ccdd8a28
Author:     Deepa Dinamani <deepa.kernel@xxxxxxxxx>
AuthorDate: Tue, 13 Mar 2018 21:03:28 -0700
Committer:  Arnd Bergmann <arnd@xxxxxxxx>
CommitDate: Thu, 19 Apr 2018 13:30:40 +0200

time: 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@xxxxxxxxx>
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 arch/Kconfig | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/Kconfig b/arch/Kconfig
index 16e6acfe8711..4377b0cec976 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -878,6 +878,13 @@ 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
 
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