linux-kernel - Re: [PATCH] virtio-blk: make the queue depth configurable

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Message-ID: <1395041214.2556.17.camel@joe-AO722>
Date:	Mon, 17 Mar 2014 00:26:54 -0700
From:	Joe Perches <joe@...ches.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Theodore Ts'o <tytso@....edu>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	virtio-dev@...ts.oasis-open.org,
	virtualization@...ts.linux-foundation.org, fes@...gle.com
Subject: Re: [PATCH] virtio-blk: make the queue depth configurable

On Sun, 2014-03-16 at 22:00 -0700, Joe Perches wrote:
> On Mon, 2014-03-17 at 14:25 +1030, Rusty Russell wrote:
> 
> > Erk, our tests are insufficient.  Testbuilding an allmodconfig with this
> > now:
> 
> Good idea.
> 
> > diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
> []
> > @@ -188,6 +188,9 @@ struct kparam_array
> >  	/* Default value instead of permissions? */			\
> >  	static int __param_perm_check_##name __attribute__((unused)) =	\
> >  	BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2))	\
> > +	/* User perms >= group perms >= other perms. */			\
> > +	+ BUILD_BUG_ON_ZERO(((perm) >> 6) < (((perm) >> 3) & 7))	\
> > +	+ BUILD_BUG_ON_ZERO((((perm) >> 3) & 7) < ((perm) & 7))		\
> >  	+ BUILD_BUG_ON_ZERO(sizeof(""prefix) > MAX_PARAM_PREFIX_LEN);	\
> >  	static const char __param_str_##name[] = prefix #name;		\
> >  	static struct kernel_param __moduleparam_const __param_##name	\
> 
> It might make sense to separate this octal permissions
> test into a new macro for other checks in macros like
> CLASS_ATTR, DEVICE_ATTR, SENSOR_ATTR and SENSOR_ATTR_2.
> 
> Maybe something like:
> 
> #define VERIFY_OCTAL_PERMISSIONS(perm)					\
> 	static int __param_perm_check_##name __attribute__((unused)) =	\
> 	BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2))	\
> 	/* User perms >= group perms >= other perms. */			\
> 	+ BUILD_BUG_ON_ZERO(((perm) >> 6) < (((perm) >> 3) & 7))	\
> 	+ BUILD_BUG_ON_ZERO((((perm) >> 3) & 7) < ((perm) & 7));	\

Maybe this is better:

#define VERIFY_OCTAL_PERMISSIONS(perms)					\
({									\
	if (__builtin_constant_p(perms)) {				\
		BUILD_BUG_ON((perms) < 0);				\
		BUILD_BUG_ON((perms) > 0777);				\
		/* User perms >= group perms >= other perms */		\
		BUILD_BUG_ON(((perms) >> 6) < (((perms) >> 3) & 7));	\
		BUILD_BUG_ON((((perms) >> 3) & 7) < ((perms) & 7));	\
	}								\
	;								\
})


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