Re: [PATCH v2 1/2] fork: free vmapped stacks in cache when cpus are offline

From: kbuild test robot
Date: Thu Feb 09 2017 - 05:18:19 EST

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In reply to: Hoeun Ryu: "Re: [PATCH v2 1/2] fork: free vmapped stacks in cache when cpus are offline"
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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
reproduce:
# apt-get install sparse
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__

sparse warnings: (new ones prefixed by >>)

include/linux/compiler.h:264:8: sparse: attribute 'no_sanitize_address': unknown attribute
kernel/fork.c:177:25: sparse: undefined identifier 'NR_CACHED_STACKS'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
>> kernel/fork.c:178:46: sparse: incompatible types for operation (+)
kernel/fork.c:178:46: left side has type bad type
kernel/fork.c:178:46: right side has type int [signed] [assigned] i
>> kernel/fork.c:178:46: sparse: cannot dereference this type
>> kernel/fork.c:178:46: sparse: incompatible types for operation (+)
kernel/fork.c:178:46: left side has type bad type
kernel/fork.c:178:46: right side has type int
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for operation (+)
kernel/fork.c:178:46: left side has type bad type
kernel/fork.c:178:46: right side has type int [signed] [assigned] i
>> kernel/fork.c:178:46: sparse: cannot dereference this type
>> kernel/fork.c:178:46: sparse: incompatible types for operation (+)
kernel/fork.c:178:46: left side has type bad type
kernel/fork.c:178:46: right side has type int [signed] [assigned] i
>> kernel/fork.c:178:46: sparse: cannot dereference this type
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for operation (+)
kernel/fork.c:178:46: left side has type bad type
kernel/fork.c:178:46: right side has type int [signed] [assigned] i
>> kernel/fork.c:178:46: sparse: cannot dereference this type
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for operation (+)
kernel/fork.c:178:46: left side has type bad type
kernel/fork.c:178:46: right side has type int [signed] [assigned] i
>> kernel/fork.c:178:46: sparse: cannot dereference this type
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:178:46: sparse: undefined identifier 'cached_stacks'
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for operation (+)
kernel/fork.c:178:46: left side has type bad type
kernel/fork.c:178:46: right side has type int [signed] [assigned] i
>> kernel/fork.c:178:46: sparse: cannot dereference this type
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
>> kernel/fork.c:178:46: sparse: incompatible types for 'case' statement
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: incompatible types for operation (+)
kernel/fork.c:183:17: left side has type bad type
kernel/fork.c:183:17: right side has type int [signed] [assigned] i
kernel/fork.c:183:17: sparse: cannot dereference this type
kernel/fork.c:183:17: sparse: incompatible types for operation (+)
kernel/fork.c:183:17: left side has type bad type
kernel/fork.c:183:17: right side has type int
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: incompatible types for operation (+)
kernel/fork.c:183:17: left side has type bad type
kernel/fork.c:183:17: right side has type int [signed] [assigned] i
kernel/fork.c:183:17: sparse: cannot dereference this type
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: incompatible types for 'case' statement
kernel/fork.c:183:17: sparse: incompatible types for 'case' statement
kernel/fork.c:183:17: sparse: incompatible types for 'case' statement
kernel/fork.c:183:17: sparse: incompatible types for 'case' statement
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: incompatible types for operation (+)
kernel/fork.c:183:17: left side has type bad type
kernel/fork.c:183:17: right side has type int [signed] [assigned] i
kernel/fork.c:183:17: sparse: cannot dereference this type
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: incompatible types for 'case' statement
kernel/fork.c:183:17: sparse: incompatible types for 'case' statement
kernel/fork.c:183:17: sparse: incompatible types for 'case' statement
kernel/fork.c:183:17: sparse: incompatible types for 'case' statement
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: incompatible types for operation (+)
kernel/fork.c:183:17: left side has type bad type
kernel/fork.c:183:17: right side has type int [signed] [assigned] i
kernel/fork.c:183:17: sparse: cannot dereference this type
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: undefined identifier 'cached_stacks'
kernel/fork.c:183:17: sparse: incompatible types for 'case' statement
kernel/fork.c:183:17: sparse: incompatible types for 'case' statement
>> kernel/fork.c:183:17: sparse: too many errors
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:101:15: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
: "qi" ((pto_T__)(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:106:15: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
: "ri" ((pto_T__)(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:111:15: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
: "ri" ((pto_T__)(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:116:15: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]

vim +178 kernel/fork.c

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;

---
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