Re: [PATCH v2 1/2] fork: free vmapped stacks in cache when cpus are offline
From: kbuild test robot
Date: Thu Feb 09 2017 - 03:03:09 EST
Hi Hoeun,
[auto build test WARNING on next-20170208]
[also build test WARNING on v4.10-rc7]
[cannot apply to linus/master linux/master v4.9-rc8 v4.9-rc7 v4.9-rc6]
[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/Hoeun-Ryu/fork-free-vmapped-stacks-in-cache-when-cpus-are-offline/20170209-124143
config: i386-randconfig-x004-201706 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=i386
All warnings (new ones prefixed by >>):
kernel/fork.c: In function 'free_vm_stack_cache':
kernel/fork.c:177:18: error: 'NR_CACHED_STACKS' undeclared (first use in this function)
for (i = 0; i < NR_CACHED_STACKS; i++) {
^~~~~~~~~~~~~~~~
kernel/fork.c:177:18: note: each undeclared identifier is reported only once for each function it appears in
In file included from include/asm-generic/percpu.h:6:0,
from arch/x86/include/asm/percpu.h:542,
from arch/x86/include/asm/preempt.h:5,
from include/linux/preempt.h:59,
from include/linux/spinlock.h:50,
from include/linux/mmzone.h:7,
from include/linux/gfp.h:5,
from include/linux/slab.h:14,
from kernel/fork.c:14:
kernel/fork.c:178:46: error: 'cached_stacks' undeclared (first use in this function)
struct vm_struct *vm_stack = this_cpu_read(cached_stacks[i]);
^
include/linux/percpu-defs.h:305:9: note: in definition of macro '__pcpu_size_call_return'
typeof(variable) pscr_ret__; \
^~~~~~~~
kernel/fork.c:178:32: note: in expansion of macro 'this_cpu_read'
struct vm_struct *vm_stack = this_cpu_read(cached_stacks[i]);
^~~~~~~~~~~~~
include/linux/percpu-defs.h:304:1: warning: initialization makes pointer from integer without a cast [-Wint-conversion]
({ \
^
include/linux/percpu-defs.h:494:29: note: in expansion of macro '__pcpu_size_call_return'
#define this_cpu_read(pcp) __pcpu_size_call_return(this_cpu_read_, pcp)
^~~~~~~~~~~~~~~~~~~~~~~
kernel/fork.c:178:32: note: in expansion of macro 'this_cpu_read'
struct vm_struct *vm_stack = this_cpu_read(cached_stacks[i]);
^~~~~~~~~~~~~
In file included from arch/x86/include/asm/preempt.h:5:0,
from include/linux/preempt.h:59,
from include/linux/spinlock.h:50,
from include/linux/mmzone.h:7,
from include/linux/gfp.h:5,
from include/linux/slab.h:14,
from kernel/fork.c:14:
>> arch/x86/include/asm/percpu.h:94:13: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
pto_tmp__ = (val); \
^
arch/x86/include/asm/percpu.h:416:36: note: in expansion of macro 'percpu_to_op'
#define this_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val)
^~~~~~~~~~~~
include/linux/percpu-defs.h:364:11: note: in expansion of macro 'this_cpu_write_1'
case 1: stem##1(variable, __VA_ARGS__);break; \
^~~~
include/linux/percpu-defs.h:495:34: note: in expansion of macro '__pcpu_size_call'
#define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, pcp, val)
^~~~~~~~~~~~~~~~
>> kernel/fork.c:183:3: note: in expansion of macro 'this_cpu_write'
this_cpu_write(cached_stacks[i], NULL);
^~~~~~~~~~~~~~
>> arch/x86/include/asm/percpu.h:94:13: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
pto_tmp__ = (val); \
^
arch/x86/include/asm/percpu.h:417:36: note: in expansion of macro 'percpu_to_op'
#define this_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val)
^~~~~~~~~~~~
include/linux/percpu-defs.h:365:11: note: in expansion of macro 'this_cpu_write_2'
case 2: stem##2(variable, __VA_ARGS__);break; \
^~~~
include/linux/percpu-defs.h:495:34: note: in expansion of macro '__pcpu_size_call'
#define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, pcp, val)
^~~~~~~~~~~~~~~~
>> kernel/fork.c:183:3: note: in expansion of macro 'this_cpu_write'
this_cpu_write(cached_stacks[i], NULL);
^~~~~~~~~~~~~~
>> arch/x86/include/asm/percpu.h:94:13: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
pto_tmp__ = (val); \
^
arch/x86/include/asm/percpu.h:418:36: note: in expansion of macro 'percpu_to_op'
#define this_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val)
^~~~~~~~~~~~
include/linux/percpu-defs.h:366:11: note: in expansion of macro 'this_cpu_write_4'
case 4: stem##4(variable, __VA_ARGS__);break; \
^~~~
include/linux/percpu-defs.h:495:34: note: in expansion of macro '__pcpu_size_call'
#define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, pcp, val)
^~~~~~~~~~~~~~~~
>> kernel/fork.c:183:3: note: in expansion of macro 'this_cpu_write'
this_cpu_write(cached_stacks[i], NULL);
^~~~~~~~~~~~~~
At top level:
kernel/fork.c:173:12: warning: 'free_vm_stack_cache' defined but not used [-Wunused-function]
static int free_vm_stack_cache(unsigned int cpu)
^~~~~~~~~~~~~~~~~~~
vim +/this_cpu_write +183 kernel/fork.c
167 * flush. Try to minimize the number of calls by caching stacks.
168 */
169 #define NR_CACHED_STACKS 2
170 static DEFINE_PER_CPU(struct vm_struct *, cached_stacks[NR_CACHED_STACKS]);
171 #endif
172
173 static int free_vm_stack_cache(unsigned int cpu)
174 {
175 int i;
176
177 for (i = 0; i < NR_CACHED_STACKS; i++) {
178 struct vm_struct *vm_stack = this_cpu_read(cached_stacks[i]);
179 if (!vm_stack)
180 continue;
181
182 vfree(vm_stack->addr);
> 183 this_cpu_write(cached_stacks[i], NULL);
184 }
185
186 return 0;
187 }
188
189 static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, int node)
190 {
191 #ifdef CONFIG_VMAP_STACK
---
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