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SubjectRe: [PATCH 2/4] mm/hmm: fix header file if/else/endif maze
Hi Jérôme,

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/jglisse-redhat-com/mm-hmm-documentation-editorial-update-to-HMM-documentation/20180317-074102
config: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

All errors (new ones prefixed by >>):

In file included from kernel/fork.c:40:0:
>> include/linux/hmm.h:515:20: error: redefinition of 'hmm_mm_destroy'
static inline void hmm_mm_destroy(struct mm_struct *mm) {}
^~~~~~~~~~~~~~
include/linux/hmm.h:502:20: note: previous definition of 'hmm_mm_destroy' was here
static inline void hmm_mm_destroy(struct mm_struct *mm) {}
^~~~~~~~~~~~~~
>> include/linux/hmm.h:516:20: error: redefinition of 'hmm_mm_init'
static inline void hmm_mm_init(struct mm_struct *mm) {}
^~~~~~~~~~~
include/linux/hmm.h:503:20: note: previous definition of 'hmm_mm_init' was here
static inline void hmm_mm_init(struct mm_struct *mm) {}
^~~~~~~~~~~

vim +/hmm_mm_destroy +515 include/linux/hmm.h

133ff0eac Jérôme Glisse 2017-09-08 509
133ff0eac Jérôme Glisse 2017-09-08 510 static inline void hmm_mm_init(struct mm_struct *mm)
133ff0eac Jérôme Glisse 2017-09-08 511 {
133ff0eac Jérôme Glisse 2017-09-08 512 mm->hmm = NULL;
133ff0eac Jérôme Glisse 2017-09-08 513 }
6b368cd4a Jérôme Glisse 2017-09-08 514 #else /* IS_ENABLED(CONFIG_HMM_MIRROR) */
6b368cd4a Jérôme Glisse 2017-09-08 @515 static inline void hmm_mm_destroy(struct mm_struct *mm) {}
6b368cd4a Jérôme Glisse 2017-09-08 @516 static inline void hmm_mm_init(struct mm_struct *mm) {}
6b368cd4a Jérôme Glisse 2017-09-08 517 #endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */
133ff0eac Jérôme Glisse 2017-09-08 518

:::::: The code at line 515 was first introduced by commit
:::::: 6b368cd4a44ce95b33f1d31f2f932e6ae707f319 mm/hmm: avoid bloating arch that do not make use of HMM

:::::: TO: Jérôme Glisse <jglisse@redhat.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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