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SubjectRe: [PATCH 5/5] mm: convert mm_struct.mm_count from atomic_t to refcount_t
Hi Elena,

[auto build test ERROR on mmotm/master]
[also build test ERROR on next-20170220]
[cannot apply to linus/master linux/master v4.10]
[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/Elena-Reshetova/mm-subsystem-refcounter-conversions/20170220-190351
base: git://git.cmpxchg.org/linux-mmotm.git master
config: blackfin-BF561-EZKIT-SMP_defconfig (attached as .config)
compiler: bfin-uclinux-gcc (GCC) 6.2.0
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=blackfin

All errors (new ones prefixed by >>):

arch/blackfin/mach-common/smp.c: In function 'cpu_die':
>> arch/blackfin/mach-common/smp.c:426:13: error: passing argument 1 of 'atomic_dec' from incompatible pointer type [-Werror=incompatible-pointer-types]
atomic_dec(&init_mm.mm_count);
^
In file included from arch/blackfin/include/asm/atomic.h:45:0,
from include/linux/atomic.h:4,
from arch/blackfin/include/asm/spinlock.h:14,
from include/linux/spinlock.h:87,
from include/linux/seqlock.h:35,
from include/linux/time.h:5,
from include/linux/stat.h:18,
from include/linux/module.h:10,
from arch/blackfin/mach-common/smp.c:10:
include/asm-generic/atomic.h:211:20: note: expected 'atomic_t * {aka struct <anonymous> *}' but argument is of type 'refcount_t * {aka struct refcount_struct *}'
static inline void atomic_dec(atomic_t *v)
^~~~~~~~~~
cc1: some warnings being treated as errors

vim +/atomic_dec +426 arch/blackfin/mach-common/smp.c

0b39db28 Graf Yang 2009-12-28 410 return -EPERM;
0b39db28 Graf Yang 2009-12-28 411
0b39db28 Graf Yang 2009-12-28 412 set_cpu_online(cpu, false);
0b39db28 Graf Yang 2009-12-28 413 return 0;
0b39db28 Graf Yang 2009-12-28 414 }
0b39db28 Graf Yang 2009-12-28 415
13dff62d Paul Gortmaker 2013-06-18 416 int __cpu_die(unsigned int cpu)
0b39db28 Graf Yang 2009-12-28 417 {
a17b4b74 Paul E. McKenney 2015-02-26 418 return cpu_wait_death(cpu, 5);
0b39db28 Graf Yang 2009-12-28 419 }
0b39db28 Graf Yang 2009-12-28 420
0b39db28 Graf Yang 2009-12-28 421 void cpu_die(void)
0b39db28 Graf Yang 2009-12-28 422 {
a17b4b74 Paul E. McKenney 2015-02-26 423 (void)cpu_report_death();
0b39db28 Graf Yang 2009-12-28 424
afdf6066 Elena Reshetova 2017-02-20 425 refcount_dec(&init_mm.mm_users);
0b39db28 Graf Yang 2009-12-28 @426 atomic_dec(&init_mm.mm_count);
0b39db28 Graf Yang 2009-12-28 427
0b39db28 Graf Yang 2009-12-28 428 local_irq_disable();
0b39db28 Graf Yang 2009-12-28 429 platform_cpu_die();
0b39db28 Graf Yang 2009-12-28 430 }
0b39db28 Graf Yang 2009-12-28 431 #endif

:::::: The code at line 426 was first introduced by commit
:::::: 0b39db28b953945232719e7ff6fb802aa8a2be5f Blackfin: SMP: add PM/CPU hotplug support

:::::: TO: Graf Yang <graf.yang@analog.com>
:::::: CC: Mike Frysinger <vapier@gentoo.org>

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