Re: waitid() fails with EINVAL for SA_RESTART signals

[Roland McGrath]

> x86 has largely tried to move in that direction too, ie a lot of the 
> asm-calls have been turned into FASTCALL() with %eax pointing to the 
> stack.
> 
> Roland, I applied the patch, but if there was some particular case that 
> triggered this, maybe it's worth trying to re-write that one.

It's a danger for any system call.  Here it was sys_waitid.
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