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 <>
Signed-off-by: Deepa Dinamani <>
 arch/Kconfig | 8 ++++++++
 1 file changed, 8 insertions(+)

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 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.

Reply via email to