Re: uml and -regparm=3

Miklos Szeredi
2008-01-09T21:51:08Z

> FASTCALL is useless and should not make a difference. It enables
> regparm on specific functions, but that should not make a difference
> if it works or not.

__down_write() in include/asm-x86/rwsem.h seems to assume, that the
semaphore pointer is passed in %eax down to rwsem_down_write_failed(),
so regparm does make a difference there.

There's also some intervening magic in arch/x86/lib/semaphore_32.S,
that I don't quite understand, but which doesn't seem to make a
difference.

Miklos