On 08/10/2018 05:04 PM, Al Viro wrote: > Once upon a time it used to have a C part that printed a warning > about unimplemented OSF syscalls. That's what it's been doing > all over the OSF syscall range, while the native Linux syscall > range uses sys_ni_syscall(). > > With those warnings about unimplemented OSF syscalls gone (circa 2.4), > alpha_ni_syscall() has shrunk to that little bit of asm and the > only reason it hasn't been replaced with sys_ni_syscall() everywhere > is that extra twist needed in case of syscall #0. > > Let's keep it only for syscall #0 and replace the rest with sys_ni_syscall. > And use sys_ni_syscall for "number out range" in ptraced-call case, as > we'd been doing for normal codepath since 2.1.86... > > Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Acked-by: Richard Henderson <rth@xxxxxxxxxxx> > +++ b/arch/alpha/kernel/entry.S > @@ -473,7 +473,7 @@ entSys: > bne $3, strace > beq $4, 1f > ldq $27, 0($5) > -1: jsr $26, ($27), alpha_ni_syscall > +1: jsr $26, ($27), sys_ni_syscall > ldgp $gp, 0($26) > blt $0, $syscall_error /* the call failed */ > stq $0, 0($sp) Once upon a time I had a patch to make the hint be sys_gettimeofday, as the most common syscall. Dunno what happened to that. But I must guess that an unimplemented syscall has got to be the anti-hint of the ... long-ass-time-frame. r~
