linux-kernel - Re: [PATCH 07/18] mm, proc: make clear

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Date:	Mon, 29 Feb 2016 21:47:03 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	kbuild-all@...org, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	Alex Deucher <alexander.deucher@....com>,
	Alex Thorlton <athorlton@....com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Christian König <christian.koenig@....com>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	David Airlie <airlied@...ux.ie>,
	Davidlohr Bueso <dave@...olabs.net>,
	David Rientjes <rientjes@...gle.com>,
	"H . Peter Anvin" <hpa@...or.com>, Hugh Dickins <hughd@...gle.com>,
	Ingo Molnar <mingo@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	linux-arch@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Petr Cermak <petrcermak@...omium.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH 07/18] mm, proc: make clear_refs killable

Hi Michal,

[auto build test WARNING on next-20160229]
[also build test WARNING on v4.5-rc6]
[cannot apply to drm/drm-next drm-intel/for-linux-next v4.5-rc6 v4.5-rc5 v4.5-rc4]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Michal-Hocko/change-mmap_sem-taken-for-write-killable/20160229-213258
config: i386-randconfig-x003-201609 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:4:0,
                    from arch/x86/include/asm/bug.h:35,
                    from include/linux/bug.h:4,
                    from include/linux/mmdebug.h:4,
                    from include/linux/mm.h:8,
                    from fs/proc/task_mmu.c:1:
   fs/proc/task_mmu.c: In function 'clear_refs_write':
   fs/proc/task_mmu.c:1030:8: error: implicit declaration of function 'down_write_killable' [-Werror=implicit-function-declaration]
       if (down_write_killable(&mm->mmap_sem)) {
           ^
   include/linux/compiler.h:151:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^
>> fs/proc/task_mmu.c:1030:4: note: in expansion of macro 'if'
       if (down_write_killable(&mm->mmap_sem)) {
       ^
   cc1: some warnings being treated as errors

vim +/if +1030 fs/proc/task_mmu.c

  1014		task = get_proc_task(file_inode(file));
  1015		if (!task)
  1016			return -ESRCH;
  1017		mm = get_task_mm(task);
  1018		if (mm) {
  1019			struct clear_refs_private cp = {
  1020				.type = type,
  1021			};
  1022			struct mm_walk clear_refs_walk = {
  1023				.pmd_entry = clear_refs_pte_range,
  1024				.test_walk = clear_refs_test_walk,
  1025				.mm = mm,
  1026				.private = &cp,
  1027			};
  1028	
  1029			if (type == CLEAR_REFS_MM_HIWATER_RSS) {
> 1030				if (down_write_killable(&mm->mmap_sem)) {
  1031					put_task_struct(task);
  1032					return -EINTR;
  1033				}
  1034	
  1035				/*
  1036				 * Writing 5 to /proc/pid/clear_refs resets the peak
  1037				 * resident set size to this mm's current rss value.
  1038				 */

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

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