linux-kernel - Re: [PATCH 2/2 v3] cxl/region: Use cond_guard() in show

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Message-ID: <4546212.LvFx2qVVIh@fdefranc-mobl3>
Date: Wed, 07 Feb 2024 16:22:13 +0100
From: "Fabio M. De Francesco" <fabio.maria.de.francesco@...ux.intel.com>
To: Peter Zijlstra <peterz@...radead.org>,
 Dan Williams <dan.j.williams@...el.com>
Cc: linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>,
 oe-kbuild-all@...ts.linux.dev, linux-cxl@...r.kernel.org,
 Dave Jiang <dave.jiang@...el.com>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Ingo Molnar <mingo@...nel.org>, Ira Weiny <ira.weiny@...el.com>
Subject: Re: [PATCH 2/2 v3] cxl/region: Use cond_guard() in show_targetN()

On Wednesday, 7 February 2024 02:54:34 CET kernel test robot wrote:
> Hi Fabio,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on linus/master]
> [also build test WARNING on v6.8-rc3 next-20240206]
> [cannot apply to cxl/next cxl/pending]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:   
> https://github.com/intel-lab-lkp/linux/commits/Fabio-M-De-Francesco/cleanup
> -Add-cond_guard-to-conditional-guards/20240206-203110 base:   linus/master
> patch link:   
> https://lore.kernel.org/r/20240206121301.7225-3-fabio.maria.de.francesco%40
> linux.intel.com patch subject: [PATCH 2/2 v3] cxl/region: Use cond_guard()
> in show_targetN() config: s390-allyesconfig
> (https://download.01.org/0day-ci/archive/20240207/202402070919.0zuYCxMS-lkp
> @intel.com/config) compiler: s390-linux-gcc (GCC) 13.2.0
> reproduce (this is a W=1 build):
> (https://download.01.org/0day-ci/archive/20240207/202402070919.0zuYCxMS-lkp
> @intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version
> of the same patch/commit), kindly add following tags
> 
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes:
> | https://lore.kernel.org/oe-kbuild-all/202402070919.0zuYCxMS-lkp@intel.com
> | /
> All warnings (new ones prefixed by >>):
> 
>    drivers/cxl/core/region.c: In function 'show_targetN':
> >> drivers/cxl/core/region.c:670:70: warning: suggest braces around empty
> >> body in an 'else' statement [-Wempty-body]
>      670 |         cond_guard(rwsem_read_intr, return -EINTR,
> &cxl_region_rwsem);
>          |                                                                      
^

I think that this warning deserves attention and braces should be added around 
the 'else' empty body. I'm going to send v4:

#define cond_guard(_name, _ret, args...) \
        CLASS(_name, scope)(args); \
        if (!__guard_ptr(_name)(&scope)) _ret; \
        else { }

Any comments?

Fabio

> 
> vim +/else +670 drivers/cxl/core/region.c
> 
>    664
>    665	static size_t show_targetN(struct cxl_region *cxlr, char *buf, int
> pos) 666	{
>    667		struct cxl_region_params *p = &cxlr->params;
>    668		struct cxl_endpoint_decoder *cxled;
>    669
> 
>  > 670		cond_guard(rwsem_read_intr, return -EINTR, 
&cxl_region_rwsem);
> 
>    671
>    672		if (pos >= p->interleave_ways) {
>    673			dev_dbg(&cxlr->dev, "position %d out of range 
%d\n", pos,
>    674				p->interleave_ways);
>    675			return -ENXIO;
>    676		}
>    677
>    678		cxled = p->targets[pos];
>    679		if (!cxled)
>    680			return sysfs_emit(buf, "\n");
>    681
>    682		return sysfs_emit(buf, "%s\n", dev_name(&cxled-
>cxld.dev));
>    683	}
>    684