On Fri, Aug 10, 2018 at 07:31:55PM -0700, Richard Henderson wrote: > > +++ 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. Might as well... ptraced case has it, non-ptraced doesn't. BTW, seeing that it's your code - why was unop used in alpha_ni_syscall? I don't remember the rules re pipeline stalls; is it that some earlier variants prefer unop to nop in such places? It's not that microoptimizing that one makes any difference, but just out of curiosity - would something like lda $0, -ENOSYS stq $sp, 0($sp) /* sp != 0 */ ret do just as well there?
