linux-kernel - Re: [PATCH 16/28] nios2: System calls handling

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Message-ID: <20140421204634.GA22181@amd.pavel.ucw.cz>
Date:	Mon, 21 Apr 2014 22:46:34 +0200
From:	Pavel Machek <pavel@...x.de>
To:	Ley Foon Tan <lftan@...era.com>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, cltang@...esourcery.com,
	mtk.manpages@...il.com
Subject: Re: [PATCH 16/28] nios2: System calls handling

Hi!

> > Also... explanation why you need this syscall while other
> > architectures live happily without it would be nice.
> This syscall exist in nios2 port since old days and some users already
> used it for sometimes.
> Like mentioned by Greet, 12 our of 28 architectures provide such a syscall.

Would it make sense to create common code for this syscall?

> >> +/* sys_cacheflush -- flush the processor cache. */
> >> +asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len,
> >> +                             unsigned int op)
> >> +{
> >> +     struct vm_area_struct *vma;
> >> +
> >> +     if (len == 0)
> >> +             return 0;
> >
> > op is being ignored? You should remove it... or if (op) return -EINVAL
> > if you want future extensions.
> Yes, op argument is being ignored. Okay, will add the return -EINVAL
> if op is non-zero.

Thanks!
									Pavel
-- 
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