linux-kernel - Re: futex(2) man page update help request

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Message-ID: <20140515160152.GA7529@rei.Home>
Date:	Thu, 15 May 2014 18:01:53 +0200
From:	chrubis@...e.cz
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Darren Hart <dvhart@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Jakub Jelinek <jakub@...hat.com>,
	"linux-man@...r.kernel.org" <linux-man@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Arnd Bergmann <arnd@...db.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Linux API <linux-api@...r.kernel.org>,
	Carlos O'Donell <carlos@...hat.com>
Subject: Re: futex(2) man page update help request

Hi!
> > Have a look at this commit that tries to deal with passing 64 bit
> > numbers to syscalls. On 32 bit ABI (but not on X32) these needs to be
> > split up (accordingly to machine endianity).
> > 
> > https://github.com/linux-test-project/ltp/commit/04afb02b4280a20c262054e8f99a3fad4ad54916
> > 
> 
> That is wrong, too.  That assumes that there will never be padding
> words, which isn't true in the general case, either.

Well, it's still far better than the mess we had previously and it works
in most of the cases. However I would love to fix these correctly once
for all.

> I really believe the proper fix is to use assembly syscall stubs.  In
> klibc I build a fairly elaborate machinery to autogenerate such syscall
> stubs for a variety of architectures.

Then it would be nice to share these between klibc and LTP (and possible
everybody else).

-- 
Cyril Hrubis
chrubis@...e.cz
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