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SubjectRe: [PATCH] Fast Userspace Mutexes III.
On Monday 04 March 2002 11:48 pm, Rusty Russell wrote:
> On Mon, 4 Mar 2002 15:48:48 -0500
> Hubertus Franke <> wrote:
> > Also, the check on PROT_SEM is missing. I tried this before and glibc
> > filtered these flags out when set. But effectively, one still needs to
> > check whether semaphores are allowed during the sys_futex call.
> Neither arch I care about (ppc, x86) needs to do anything with PROT_SEM, so
> it's OK. glibc will have to be fixed on any architectures which require
> help here, and a hook will be needed somewhere in the kernel for them.
> I didn't implement it because I don't *know* which archs will need
> something, and what they will need. Hence my request for arch maintainers
> to step forward (Linus said they exist, and I believe him).
> Hope that clarifies this particular wart...
> Rusty.

Clarifies only partially.

I agree to put it there if its not used as a means to define whether
user locks are permitted or not. If that is the intention, then the current
futex will need to check every access through find_vma(), which we
both know nobody wants to do.

So it can only be used for architectural hints, agreed ?

-- Hubertus Franke (
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