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kernel, fs: Introduce and use set_restart_fn() and arch_set_restart_data()

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commit 5abbe51a526253b9f003e9a0a195638dc882d660 upstream.

Preparation for fixing get_nr_restart_syscall() on X86 for COMPAT.

Add a new helper which sets restart_block->fn and calls a dummy
arch_set_restart_data() helper.

Fixes: 609c19a385 ("x86/ptrace: Stop setting TS_COMPAT in ptrace code")
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210201174641.GA17871@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oleg Nesterov
2021-02-01 18:46:41 +01:00
committed by Greg Kroah-Hartman
parent 0e245256e3
commit 4523e648b7
6 changed files with 21 additions and 11 deletions
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2
kernel/time/posix-cpu-timers.c
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@@ -1480,8 +1480,8 @@ static int posix_cpu_nsleep(const clockid_t which_clock, int flags,
if (flags & TIMER_ABSTIME)
return -ERESTARTNOHAND;
restart_block->fn = posix_cpu_nsleep_restart;
restart_block->nanosleep.clockid = which_clock;
set_restart_fn(restart_block, posix_cpu_nsleep_restart);
}
return error;
}