linux-kernel - Re: [PATCH 7/8] percpu: add __percpu sparse annotations to hw

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Message-ID: <20100126023542.GQ5087@nowhere>
Date:	Tue, 26 Jan 2010 03:35:43 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, axboe@...nel.dk,
	rusty@...tcorp.com.au, akpm@...ux-foundation.org,
	ebiederm@...ssion.com, tytso@....edu, Trond.Myklebust@...app.com,
	aelder@....com, hch@...radead.org, viro@...iv.linux.org.uk,
	davem@...emloft.net, netdev@...r.kernel.org, x86@...nel.org,
	mingo@...hat.com, dan.j.williams@...el.com,
	borislav.petkov@....com, ying.huang@...el.com, lenb@...nel.org,
	neilb@...e.de, cl@...ux-foundation.org
Subject: Re: [PATCH 7/8] percpu: add __percpu sparse annotations to
	hw_breakpoint

On Tue, Jan 26, 2010 at 11:34:40AM +0900, Tejun Heo wrote:
> On 01/26/2010 11:22 AM, Frederic Weisbecker wrote:
> >> What about this? It doesn't use direct cast to scalar but should
> >> create a pointer type to kernel space datas:
> >>
> >>
> >> #define kernel_space_t(var)	\
> >> 	(typeof(var)	__kernel __force)
> > 
> > 
> > Should be typeof(*var)
> > 
> >>
> >> #define SHIFT_PERCPU_PTR(__p, __offset) ({                              \
> >>         __verify_pcpu_ptr((__p));                                       \
> >>         RELOC_HIDE((typeof(*(kernel_space_t(var)) __kernel __force *)(__p), (__offset)); \
> >> })
> 
> Can you balance ()'s here too?


#define kernel_space_t(var)        \
    (typeof(*(var))    __kernel __force)


/* Weird cast keeps both GCC and sparse happy. */
#define SHIFT_PERCPU_PTR(__p, __offset) ({                              \
        __verify_pcpu_ptr((__p));                                       \
        RELOC_HIDE((typeof(*(kernel_space_t(__p))) __kernel __force *)(__p), (__offset)); \
})

#define per_cpu(var, cpu) \
        (*SHIFT_PERCPU_PTR(&(var), per_cpu_offset(cpu)));


No guarantee that will build. I should pull your tree and install
sparse (yeah, shame on me, I've never installed it).

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