time: Introduce CONFIG_64BIT_TIME in architectures

There are a total of 53 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_64BIT_TIME symbol. Every architecture that supports
new 64 bit time_t syscalls enables this config.

After this is done for all architectures, the CONFIG_64BIT_TIME symbol
will be deleted.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index 8e0d665c8d53..16e6acfe8711 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -870,6 +870,14 @@ config OLD_SIGACTION
 config COMPAT_OLD_SIGACTION
         bool
 
+config 64BIT_TIME
+        def_bool ARCH_HAS_64BIT_TIME
+        help
+          This should be selected by all architectures that need to support
+          new system calls with a 64-bit time_t. 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