linux-kernel - Re: mmotm 2021-02-08-15-44 uploaded (mm-cma-print-region-name-on-failure.patch)

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Date:   Tue, 9 Feb 2021 16:26:44 +0200
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Randy Dunlap <rdunlap@...radead.org>, akpm@...ux-foundation.org,
        broonie@...nel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-next@...r.kernel.org, mhocko@...e.cz,
        mm-commits@...r.kernel.org, sfr@...b.auug.org.au,
        Patrick Daly <pdaly@...eaurora.org>
Subject: Re: mmotm 2021-02-08-15-44 uploaded
 (mm-cma-print-region-name-on-failure.patch)

On 2/9/21 06:03, Randy Dunlap wrote:
> On 2/8/21 3:45 PM, akpm@...ux-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.

Good catch. Sorry, it was not intentional.

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

Thanks! I have fixed these and sent v2.

BR,
Georgi