On Mon, 30 Jun 2025 at 09:55, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
> > Is any arch other than i386 limited to fewer than four register arguments?
>
> amd64, for one
No, x86-64 has 6 argument registers.
Anyway, the use of 'qstr' doesn't actually change any of that, since
it will use exactly the same number of argument registers as having
separate 'char *, len' arguments.
But the thing that makes qstr nice is that it's not only a good
abstraction, we also have useful helper macros for exactly this use.
IOW, instead of passing in "name, strlen(name)", you can use
"QSTR(name)" which does exactly that.
Linus
