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SubjectRe: [PATCH v6 07/15] fs, dax: use page->mapping to warn if truncate collides with a busy page
Hi Dan,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.16-rc5 next-20180316]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Dan-Williams/dax-fix-dma-vs-truncate-hole-punch/20180318-050250
config: xtensa-allmodconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=xtensa

All error/warnings (new ones prefixed by >>):

fs/dax.c: In function 'dax_entry_size':
>> fs/dax.c:308:10: error: 'HPAGE_SIZE' undeclared (first use in this function); did you mean 'PAGE_SIZE'?
return HPAGE_SIZE;
^~~~~~~~~~
PAGE_SIZE
fs/dax.c:308:10: note: each undeclared identifier is reported only once for each function it appears in
>> fs/dax.c:311:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^

vim +308 fs/dax.c

300
301 static unsigned long dax_entry_size(void *entry)
302 {
303 if (dax_is_zero_entry(entry))
304 return 0;
305 else if (dax_is_empty_entry(entry))
306 return 0;
307 else if (dax_is_pmd_entry(entry))
> 308 return HPAGE_SIZE;
309 else
310 return PAGE_SIZE;
> 311 }
312

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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