On Wed, 10 Feb 2016 16:55:14 +1100 Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
> Hi Andrew,
>
> After merging the akpm-current tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
>
> In file included from arch/x86/include/asm/bug.h:35:0,
> from include/linux/bug.h:4,
> from include/linux/thread_info.h:11,
> from arch/x86/include/asm/preempt.h:6,
> from include/linux/preempt.h:59,
> from include/linux/radix-tree.h:25,
> from kernel/memremap.c:13:
> kernel/memremap.c: In function 'devm_memremap_pages_release':
> kernel/memremap.c:230:54: error: expected ')' before '__func__'
> dev_WARN(dev, "%s: page mapping is still live!\n", __func__);
> ^
> include/asm-generic/bug.h:74:69: note: in definition of macro '__WARN_printf'
> #define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg)
> ^
> include/linux/device.h:1312:2: note: in expansion of macro 'WARN'
> WARN(condition, "%s %s: " format, \
> ^
> kernel/memremap.c:230:3: note: in expansion of macro 'dev_WARN'
> dev_WARN(dev, "%s: page mapping is still live!\n", __func__);
> ^
> include/linux/device.h:1312:18: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
> WARN(condition, "%s %s: " format, \
> ^
> include/asm-generic/bug.h:74:69: note: in definition of macro '__WARN_printf'
> #define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg)
> ^
> include/linux/device.h:1312:2: note: in expansion of macro 'WARN'
> WARN(condition, "%s %s: " format, \
> ^
> kernel/memremap.c:230:3: note: in expansion of macro 'dev_WARN'
> dev_WARN(dev, "%s: page mapping is still live!\n", __func__);
> ^
>
> Probably exposed by commit
>
> 27ffb3827ac7 ("mm: CONFIG_NR_ZONES_EXTENDED")
>
> originally caused by commit
>
> 5c2c2587b132 ("mm, dax, pmem: introduce {get|put}_dev_pagemap() for dax-gup")
>
> which was added in v4.5-rc1.
>
> I added the below patch for today but then discovered the waiting patch
> in the akpm tree ("kernel/memremap.c: add new arg to dev_WARN") which
> should be sent to Linus ASAP (and should have appeared much earlier in
> the series).
kernel-memremapc-add-new-arg-to-dev_warn.patch fixes ee49ac85bc24b946
("treewide: let dev_WARN() accept a condition") which is only in
linux-next?
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