kernel, fs: Introduce and use set_restart_fn() and arch_set_restart_data()
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: 609c19a3 ("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
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