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Subject: Re: mmotm 2021-02-08-15-44 uploaded
 (mm-cma-print-region-name-on-failure.patch)
To:     akpm@linux-foundation.org, broonie@kernel.org,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, linux-next@vger.kernel.org, mhocko@suse.cz,
        mm-commits@vger.kernel.org, sfr@canb.auug.org.au,
        Patrick Daly <pdaly@codeaurora.org>
References: <20210208234508.iCc6kmL1z%akpm@linux-foundation.org>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <c85a7dba-2f2a-c518-ab9d-26a0c934adda@infradead.org>
Date:   Mon, 8 Feb 2021 20:03:09 -0800
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On 2/8/21 3:45 PM, akpm@linux-foundation.org wrote:
> The mm-of-the-moment snapshot 2021-02-08-15-44 has been uploaded to
> 
>    https://www.ozlabs.org/~akpm/mmotm/
> 
> mmotm-readme.txt says
> 
> README for mm-of-the-moment:
> 
> https://www.ozlabs.org/~akpm/mmotm/
> 
> This is a snapshot of my -mm patch queue.  Uploaded at random hopefully
> more than once a week.
> 
> You will need quilt to apply these patches to the latest Linus release (5.x
> or 5.x-rcY).  The series file is in broken-out.tar.gz and is duplicated in
> https://ozlabs.org/~akpm/mmotm/series
> 
> The file broken-out.tar.gz contains two datestamp files: .DATE and
> .DATE-yyyy-mm-dd-hh-mm-ss.  Both contain the string yyyy-mm-dd-hh-mm-ss,
> followed by the base kernel version against which this patch series is to
> be applied.
> 
> This tree is partially included in linux-next.  To see which patches are
> included in linux-next, consult the `series' file.  Only the patches
> within the #NEXT_PATCHES_START/#NEXT_PATCHES_END markers are included in
> linux-next.

mm-cma-print-region-name-on-failure.patch:

This causes a printk format warning on i386 (these used to be readable):

In file included from ../include/linux/printk.h:7:0,
                 from ../include/linux/kernel.h:16,
                 from ../include/asm-generic/bug.h:20,
                 from ../arch/x86/include/asm/bug.h:93,
                 from ../include/linux/bug.h:5,
                 from ../include/linux/mmdebug.h:5,
                 from ../include/linux/mm.h:9,
                 from ../include/linux/memblock.h:13,
                 from ../mm/cma.c:24:
../mm/cma.c: In function ‘cma_alloc’:
../include/linux/kern_levels.h:5:18: warning: format ‘%zu’ expects argument of type ‘size_t’, but argument 4 has type ‘long unsigned int’ [-Wformat=]
 #define KERN_SOH "\001"  /* ASCII Start Of Header */
                  ^
../include/linux/kern_levels.h:11:18: note: in expansion of macro ‘KERN_SOH’
 #define KERN_ERR KERN_SOH "3" /* error conditions */
                  ^~~~~~~~
../include/linux/printk.h:343:9: note: in expansion of macro ‘KERN_ERR’
  printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
         ^~~~~~~~
../mm/cma.c:503:3: note: in expansion of macro ‘pr_err’
   pr_err("%s: %s: alloc failed, req-size: %zu pages, ret: %d\n",
   ^~~~~~
../mm/cma.c:503:45: note: format string is defined here
   pr_err("%s: %s: alloc failed, req-size: %zu pages, ret: %d\n",
                                           ~~^
                                           %lu

because the type of count is not the same as the type of cma->count.

Furthermore, are you sure that cma->count is the same value as count?
I'm not.


(also s/convienience/convenience/ in the patch description)

thanks.
-- 
~Randy