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asm-generic: Make time32 syscall numbers optional

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We don't want new architectures to even provide the old 32-bit time_t
based system calls any more, or define the syscall number macros.

Add a new __ARCH_WANT_TIME32_SYSCALLS macro that gets enabled for all
existing 32-bit architectures using the generic system call table,
so we don't change any current behavior.
Since this symbol is evaluated in user space as well, we cannot use
a Kconfig CONFIG_* macro but have to define it in uapi/asm/unistd.h.

On 64-bit architectures, the same system call numbers mostly refer to
the system calls we want to keep, as they already pass 64-bit time_t.

As new architectures no longer provide these, we need new exceptions
in checksyscalls.sh.

Signed-off-by: Arnd Bergmann <[email protected]>
This commit is contained in:
Arnd Bergmann 2019-02-18 17:30:06 +01:00
commit c8ce48f065
13 changed files with 56 additions and 0 deletions
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7
scripts/checksyscalls.sh
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@ -143,6 +143,13 @@ cat << EOF
#define __IGNORE_rt_sigtimedwait
#define __IGNORE_futex
#define __IGNORE_sched_rr_get_interval
#define __IGNORE_gettimeofday
#define __IGNORE_settimeofday
#define __IGNORE_wait4
#define __IGNORE_adjtimex
#define __IGNORE_nanosleep
#define __IGNORE_io_getevents
#define __IGNORE_recvmmsg
#endif
/* i386-specific or historical system calls */