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Date: Wed, 24 May 2017 04:58:41 +0800
From: kbuild test robot <fengguang.wu@...el.com>
To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc: kbuild-all@...org, linux-kernel@...r.kernel.org
Subject: [rcu:ms 1/2] arch/x86/events/core.c:2123:44: error: 'struct
mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_sem1'?
tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git ms
head: 49683159093b2bd63321b7e997e225a40fe5f3cd
commit: 369e989ee2578ff47cd28f1fcfa8c076dfdb5a8d [1/2] mm: Add wrapper functions for mmap_sem acquire and release
config: i386-tinyconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
git checkout 369e989ee2578ff47cd28f1fcfa8c076dfdb5a8d
# save the attached .config to linux build tree
make ARCH=i386
Note: the rcu/ms HEAD 49683159093b2bd63321b7e997e225a40fe5f3cd builds fine.
It only hurts bisectibility.
All errors (new ones prefixed by >>):
In file included from include/linux/spinlock_types.h:18:0,
from include/linux/spinlock.h:81,
from include/linux/rcupdate.h:38,
from include/linux/rculist.h:10,
from include/linux/pid.h:4,
from include/linux/sched.h:13,
from include/linux/uaccess.h:4,
from arch/x86/include/asm/stacktrace.h:9,
from arch/x86/include/asm/perf_event.h:246,
from include/linux/perf_event.h:24,
from arch/x86/events/core.c:15:
arch/x86/events/core.c: In function 'x86_pmu_event_mapped':
>> arch/x86/events/core.c:2123:44: error: 'struct mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_sem1'?
lockdep_assert_held_exclusive(¤t->mm->mmap_sem);
^
include/linux/lockdep.h:454:54: note: in definition of macro 'lockdep_assert_held_exclusive'
#define lockdep_assert_held_exclusive(l) do { (void)(l); } while (0)
^
--
arch/x86/mm/fault.c: In function '__bad_area':
>> arch/x86/mm/fault.c:973:13: error: 'struct mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_sem1'?
up_read(&mm->mmap_sem);
^~
arch/x86/mm/fault.c: In function '__do_page_fault':
arch/x86/mm/fault.c:1281:15: error: 'struct mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_sem1'?
prefetchw(&mm->mmap_sem);
^~
In file included from arch/x86/include/asm/current.h:4:0,
from include/linux/sched.h:11,
from arch/x86/mm/fault.c:6:
arch/x86/mm/fault.c:1384:37: error: 'struct mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_sem1'?
if (unlikely(!down_read_trylock(&mm->mmap_sem))) {
^
include/linux/compiler.h:179:42: note: in definition of macro 'unlikely'
# define unlikely(x) __builtin_expect(!!(x), 0)
^
arch/x86/mm/fault.c:1391:16: error: 'struct mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_sem1'?
down_read(&mm->mmap_sem);
^~
arch/x86/mm/fault.c:1471:13: error: 'struct mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_sem1'?
up_read(&mm->mmap_sem);
^~
--
arch/x86/entry/vdso/vma.c: In function 'map_vdso':
>> arch/x86/entry/vdso/vma.c:161:29: error: 'struct mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_sem1'?
if (down_write_killable(&mm->mmap_sem))
^~
arch/x86/entry/vdso/vma.c:204:14: error: 'struct mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_sem1'?
up_write(&mm->mmap_sem);
^~
arch/x86/entry/vdso/vma.c: In function 'map_vdso_once':
arch/x86/entry/vdso/vma.c:266:16: error: 'struct mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_sem1'?
down_write(&mm->mmap_sem);
^~
arch/x86/entry/vdso/vma.c:277:16: error: 'struct mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_sem1'?
up_write(&mm->mmap_sem);
^~
arch/x86/entry/vdso/vma.c:281:14: error: 'struct mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_sem1'?
up_write(&mm->mmap_sem);
^~
--
kernel//events/core.c: In function 'perf_event_addr_filters_apply':
>> kernel//events/core.c:8241:15: error: 'struct mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_sem1'?
down_read(&mm->mmap_sem);
^~
kernel//events/core.c:8261:13: error: 'struct mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_sem1'?
up_read(&mm->mmap_sem);
^~
vim +2123 arch/x86/events/core.c
4b07372a arch/x86/events/core.c Andy Lutomirski 2017-03-16 2117 * userspace with CR4.PCE clear while another task is still
4b07372a arch/x86/events/core.c Andy Lutomirski 2017-03-16 2118 * doing on_each_cpu_mask() to propagate CR4.PCE.
4b07372a arch/x86/events/core.c Andy Lutomirski 2017-03-16 2119 *
4b07372a arch/x86/events/core.c Andy Lutomirski 2017-03-16 2120 * For now, this can't happen because all callers hold mmap_sem
4b07372a arch/x86/events/core.c Andy Lutomirski 2017-03-16 2121 * for write. If this changes, we'll need a different solution.
4b07372a arch/x86/events/core.c Andy Lutomirski 2017-03-16 2122 */
4b07372a arch/x86/events/core.c Andy Lutomirski 2017-03-16 @2123 lockdep_assert_held_exclusive(¤t->mm->mmap_sem);
4b07372a arch/x86/events/core.c Andy Lutomirski 2017-03-16 2124
7911d3f7 arch/x86/kernel/cpu/perf_event.c Andy Lutomirski 2014-10-24 2125 if (atomic_inc_return(¤t->mm->context.perf_rdpmc_allowed) == 1)
7911d3f7 arch/x86/kernel/cpu/perf_event.c Andy Lutomirski 2014-10-24 2126 on_each_cpu_mask(mm_cpumask(current->mm), refresh_pce, NULL, 1);
:::::: The code at line 2123 was first introduced by commit
:::::: 4b07372a32c0c1505a7634ad7e607d83340ef645 x86/perf: Clarify why x86_pmu_event_mapped() isn't racy
:::::: TO: Andy Lutomirski <luto@...nel.org>
:::::: CC: Ingo Molnar <mingo@...nel.org>
---
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