From: kernel test robot <lkp@intel.com>
To: wangyufei <wangyufei@vivo.com>
Cc: oe-kbuild-all@lists.linux.dev
Subject: Re: [RFC 1/1] writeback: add sysfs to config the number of writeback contexts
Date: Thu, 13 Aug 2026 18:47:57 +0800 [thread overview]
Message-ID: <202608131809.2ZEzONCi-lkp@intel.com> (raw)
In-Reply-To: <20250825122931.13037-2-wangyufei@vivo.com>
Hi wangyufei,
[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:
[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on linus/master v7.2-rc7 next-20260812]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/wangyufei/writeback-add-sysfs-to-config-the-number-of-writeback-contexts/20260813-143259
base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link: https://lore.kernel.org/r/20250825122931.13037-2-wangyufei%40vivo.com
patch subject: [RFC 1/1] writeback: add sysfs to config the number of writeback contexts
config: powerpc-allmodconfig (https://download.01.org/0day-ci/archive/20260813/202608131809.2ZEzONCi-lkp@intel.com/config)
compiler: powerpc64-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260813/202608131809.2ZEzONCi-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608131809.2ZEzONCi-lkp@intel.com/
All error/warnings (new ones prefixed by >>):
In file included from mm/filemap.c:33:
>> include/linux/backing-dev.h:118:58: warning: 'struct bdi_writeback_ctx' declared inside parameter list will not be visible outside of this definition or declaration
118 | int bdi_wb_ctx_init(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx);
| ^~~~~~~~~~~~~~~~~
include/linux/backing-dev.h:119:59: warning: 'struct bdi_writeback_ctx' declared inside parameter list will not be visible outside of this definition or declaration
119 | void bdi_wb_ctx_exit(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx);
| ^~~~~~~~~~~~~~~~~
--
In file included from mm/page-writeback.c:26:
>> include/linux/backing-dev.h:118:58: warning: 'struct bdi_writeback_ctx' declared inside parameter list will not be visible outside of this definition or declaration
118 | int bdi_wb_ctx_init(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx);
| ^~~~~~~~~~~~~~~~~
include/linux/backing-dev.h:119:59: warning: 'struct bdi_writeback_ctx' declared inside parameter list will not be visible outside of this definition or declaration
119 | void bdi_wb_ctx_exit(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx);
| ^~~~~~~~~~~~~~~~~
In file included from include/linux/kernel.h:27,
from mm/page-writeback.c:15:
mm/page-writeback.c: In function '__bdi_set_wb_ctx':
>> mm/page-writeback.c:734:32: error: 'struct backing_dev_info' has no member named 'nr_wb_ctx'
734 | for (i = 0; i < min(bdi->nr_wb_ctx, nwritebacks); i++)
| ^~
include/linux/minmax.h:92:20: note: in definition of macro '__careful_cmp_once'
92 | auto ux = (x); auto uy = (y); \
| ^
include/linux/minmax.h:105:25: note: in expansion of macro '__careful_cmp'
105 | #define min(x, y) __careful_cmp(min, x, y)
| ^~~~~~~~~~~~~
mm/page-writeback.c:734:25: note: in expansion of macro 'min'
734 | for (i = 0; i < min(bdi->nr_wb_ctx, nwritebacks); i++)
| ^~~
In file included from <command-line>:
>> include/linux/compiler.h:165:17: error: '__UNIQUE_ID_x__697' undeclared (first use in this function); did you mean '__UNIQUE_ID_y__698'?
165 | __PASTE(__UNIQUE_ID_, \
| ^~~~~~~~~~~~
include/linux/compiler_types.h:682:23: note: in definition of macro '__compiletime_assert'
682 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:702:9: note: in expansion of macro '_compiletime_assert'
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:40:37: note: in expansion of macro 'compiletime_assert'
40 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
| ^~~~~~~~~~~~~~~~~~
include/linux/minmax.h:93:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
93 | BUILD_BUG_ON_MSG(!__types_ok(ux, uy), \
| ^~~~~~~~~~~~~~~~
include/linux/minmax.h:49:25: note: in expansion of macro 'is_signed_type'
49 | #define __sign_use(ux) (is_signed_type(typeof(ux)) ? \
| ^~~~~~~~~~~~~~
include/linux/minmax.h:75:10: note: in expansion of macro '__sign_use'
75 | (__sign_use(ux) & __sign_use(uy))
| ^~~~~~~~~~
include/linux/minmax.h:93:27: note: in expansion of macro '__types_ok'
93 | BUILD_BUG_ON_MSG(!__types_ok(ux, uy), \
| ^~~~~~~~~~
include/linux/minmax.h:98:9: note: in expansion of macro '__careful_cmp_once'
98 | __careful_cmp_once(op, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
| ^~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:16:23: note: in expansion of macro '___PASTE'
16 | #define __PASTE(a, b) ___PASTE(a, b)
| ^~~~~~~~
include/linux/compiler.h:165:9: note: in expansion of macro '__PASTE'
165 | __PASTE(__UNIQUE_ID_, \
| ^~~~~~~
include/linux/minmax.h:98:38: note: in expansion of macro '__UNIQUE_ID'
98 | __careful_cmp_once(op, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
| ^~~~~~~~~~~
include/linux/minmax.h:105:25: note: in expansion of macro '__careful_cmp'
105 | #define min(x, y) __careful_cmp(min, x, y)
| ^~~~~~~~~~~~~
mm/page-writeback.c:734:25: note: in expansion of macro 'min'
734 | for (i = 0; i < min(bdi->nr_wb_ctx, nwritebacks); i++)
| ^~~
include/linux/compiler.h:165:17: note: each undeclared identifier is reported only once for each function it appears in
include/linux/compiler_types.h:682:23: note: in definition of macro '__compiletime_assert'
682 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:702:9: note: in expansion of macro '_compiletime_assert'
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:40:37: note: in expansion of macro 'compiletime_assert'
40 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
| ^~~~~~~~~~~~~~~~~~
include/linux/minmax.h:93:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
93 | BUILD_BUG_ON_MSG(!__types_ok(ux, uy), \
| ^~~~~~~~~~~~~~~~
include/linux/minmax.h:49:25: note: in expansion of macro 'is_signed_type'
49 | #define __sign_use(ux) (is_signed_type(typeof(ux)) ? \
| ^~~~~~~~~~~~~~
include/linux/minmax.h:75:10: note: in expansion of macro '__sign_use'
75 | (__sign_use(ux) & __sign_use(uy))
| ^~~~~~~~~~
include/linux/minmax.h:93:27: note: in expansion of macro '__types_ok'
93 | BUILD_BUG_ON_MSG(!__types_ok(ux, uy), \
| ^~~~~~~~~~
include/linux/minmax.h:98:9: note: in expansion of macro '__careful_cmp_once'
98 | __careful_cmp_once(op, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
| ^~~~~~~~~~~~~~~~~~
include/linux/compiler_types.h:16:23: note: in expansion of macro '___PASTE'
16 | #define __PASTE(a, b) ___PASTE(a, b)
| ^~~~~~~~
include/linux/compiler.h:165:9: note: in expansion of macro '__PASTE'
165 | __PASTE(__UNIQUE_ID_, \
| ^~~~~~~
include/linux/minmax.h:98:38: note: in expansion of macro '__UNIQUE_ID'
98 | __careful_cmp_once(op, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
| ^~~~~~~~~~~
include/linux/minmax.h:105:25: note: in expansion of macro '__careful_cmp'
105 | #define min(x, y) __careful_cmp(min, x, y)
| ^~~~~~~~~~~~~
mm/page-writeback.c:734:25: note: in expansion of macro 'min'
734 | for (i = 0; i < min(bdi->nr_wb_ctx, nwritebacks); i++)
| ^~~
>> mm/page-writeback.c:735:37: error: 'struct backing_dev_info' has no member named 'wb_ctx_arr'
735 | new_ctx_arr[i] = bdi->wb_ctx_arr[i];
| ^~
mm/page-writeback.c:737:21: error: 'struct backing_dev_info' has no member named 'nr_wb_ctx'
737 | for (i = bdi->nr_wb_ctx; i < nwritebacks; i++) {
| ^~
In file included from include/linux/workqueue.h:9,
from include/linux/srcu.h:21,
from include/linux/notifier.h:16,
from arch/powerpc/include/asm/uprobes.h:12,
from include/linux/uprobes.h:66,
from include/linux/mm_types.h:16,
from include/linux/mmzone.h:22,
from include/linux/gfp.h:7,
from include/linux/xarray.h:16,
from include/linux/list_lru.h:14,
from include/linux/fs/super_types.h:7,
from include/linux/fs/super.h:5,
from include/linux/fs.h:5,
from mm/page-writeback.c:19:
>> mm/page-writeback.c:739:40: error: invalid application of 'sizeof' to incomplete type 'struct bdi_writeback_ctx'
739 | kzalloc(sizeof(struct bdi_writeback_ctx), GFP_KERNEL);
| ^~~~~~
include/linux/alloc_tag.h:256:16: note: in definition of macro 'alloc_hooks_tag'
256 | typeof(_do_alloc) _res; \
| ^~~~~~~~~
include/linux/slab.h:1320:49: note: in expansion of macro 'alloc_hooks'
1320 | #define kzalloc(size, flags) alloc_hooks(kzalloc_noprof(size, flags))
| ^~~~~~~~~~~
include/linux/slab.h:1320:61: note: in expansion of macro 'kzalloc_noprof'
1320 | #define kzalloc(size, flags) alloc_hooks(kzalloc_noprof(size, flags))
| ^~~~~~~~~~~~~~
mm/page-writeback.c:739:25: note: in expansion of macro 'kzalloc'
739 | kzalloc(sizeof(struct bdi_writeback_ctx), GFP_KERNEL);
| ^~~~~~~
>> mm/page-writeback.c:739:40: error: invalid application of 'sizeof' to incomplete type 'struct bdi_writeback_ctx'
739 | kzalloc(sizeof(struct bdi_writeback_ctx), GFP_KERNEL);
| ^~~~~~
include/linux/alloc_tag.h:260:24: note: in definition of macro 'alloc_hooks_tag'
260 | _res = _do_alloc; \
| ^~~~~~~~~
include/linux/slab.h:1320:49: note: in expansion of macro 'alloc_hooks'
1320 | #define kzalloc(size, flags) alloc_hooks(kzalloc_noprof(size, flags))
| ^~~~~~~~~~~
include/linux/slab.h:1320:61: note: in expansion of macro 'kzalloc_noprof'
1320 | #define kzalloc(size, flags) alloc_hooks(kzalloc_noprof(size, flags))
| ^~~~~~~~~~~~~~
mm/page-writeback.c:739:25: note: in expansion of macro 'kzalloc'
739 | kzalloc(sizeof(struct bdi_writeback_ctx), GFP_KERNEL);
| ^~~~~~~
>> mm/page-writeback.c:739:40: error: invalid application of 'sizeof' to incomplete type 'struct bdi_writeback_ctx'
739 | kzalloc(sizeof(struct bdi_writeback_ctx), GFP_KERNEL);
| ^~~~~~
include/linux/alloc_tag.h:263:24: note: in definition of macro 'alloc_hooks_tag'
263 | _res = _do_alloc; \
| ^~~~~~~~~
include/linux/slab.h:1320:49: note: in expansion of macro 'alloc_hooks'
1320 | #define kzalloc(size, flags) alloc_hooks(kzalloc_noprof(size, flags))
| ^~~~~~~~~~~
include/linux/slab.h:1320:61: note: in expansion of macro 'kzalloc_noprof'
1320 | #define kzalloc(size, flags) alloc_hooks(kzalloc_noprof(size, flags))
| ^~~~~~~~~~~~~~
mm/page-writeback.c:739:25: note: in expansion of macro 'kzalloc'
739 | kzalloc(sizeof(struct bdi_writeback_ctx), GFP_KERNEL);
| ^~~~~~~
>> mm/page-writeback.c:738:34: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
738 | new_ctx_arr[i] = (struct bdi_writeback_ctx *)
| ^
mm/page-writeback.c:742:42: error: 'struct backing_dev_info' has no member named 'nr_wb_ctx'
742 | while (--i >= bdi->nr_wb_ctx)
| ^~
>> mm/page-writeback.c:747:47: error: invalid use of undefined type 'struct bdi_writeback_ctx'
747 | INIT_LIST_HEAD(&new_ctx_arr[i]->wb_list);
| ^~
In file included from include/linux/swait.h:8,
from include/linux/completion.h:12,
from include/linux/shrinker.h:8,
from include/linux/list_lru.h:13:
mm/page-writeback.c:748:52: error: invalid use of undefined type 'struct bdi_writeback_ctx'
748 | init_waitqueue_head(&new_ctx_arr[i]->wb_waitq);
| ^~
include/linux/wait.h:68:40: note: in definition of macro 'init_waitqueue_head'
68 | __init_waitqueue_head((wq_head), #wq_head, &__key); \
| ^~~~~~~
mm/page-writeback.c:751:21: error: 'struct backing_dev_info' has no member named 'nr_wb_ctx'
751 | for (i = bdi->nr_wb_ctx; i < nwritebacks; i++) {
| ^~
>> mm/page-writeback.c:752:55: error: passing argument 2 of 'bdi_wb_ctx_init' from incompatible pointer type [-Wincompatible-pointer-types]
752 | ret = bdi_wb_ctx_init(bdi, new_ctx_arr[i]);
| ~~~~~~~~~~~^~~
| |
| struct bdi_writeback_ctx *
include/linux/backing-dev.h:118:77: note: expected 'struct bdi_writeback_ctx *' but argument is of type 'struct bdi_writeback_ctx *'
118 | int bdi_wb_ctx_init(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
mm/page-writeback.c:754:42: error: 'struct backing_dev_info' has no member named 'nr_wb_ctx'
754 | while (--i >= bdi->nr_wb_ctx) {
| ^~
>> mm/page-writeback.c:755:65: error: passing argument 2 of 'bdi_wb_ctx_exit' from incompatible pointer type [-Wincompatible-pointer-types]
755 | bdi_wb_ctx_exit(bdi, new_ctx_arr[i]);
| ~~~~~~~~~~~^~~
| |
| struct bdi_writeback_ctx *
include/linux/backing-dev.h:119:78: note: expected 'struct bdi_writeback_ctx *' but argument is of type 'struct bdi_writeback_ctx *'
119 | void bdi_wb_ctx_exit(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
mm/page-writeback.c:761:50: error: invalid use of undefined type 'struct bdi_writeback_ctx'
761 | list_add_tail_rcu(&new_ctx_arr[i]->wb.bdi_node, &new_ctx_arr[i]->wb_list);
| ^~
mm/page-writeback.c:761:80: error: invalid use of undefined type 'struct bdi_writeback_ctx'
761 | list_add_tail_rcu(&new_ctx_arr[i]->wb.bdi_node, &new_ctx_arr[i]->wb_list);
| ^~
mm/page-writeback.c:762:55: error: invalid use of undefined type 'struct bdi_writeback_ctx'
762 | set_bit(WB_registered, &new_ctx_arr[i]->wb.state);
| ^~
mm/page-writeback.c:768:26: error: 'struct backing_dev_info' has no member named 'wb_ctx_arr'
768 | old_ctx_arr = bdi->wb_ctx_arr;
| ^~
mm/page-writeback.c:770:12: error: 'struct backing_dev_info' has no member named 'wb_ctx_arr'
770 | bdi->wb_ctx_arr = new_ctx_arr;
| ^~
mm/page-writeback.c:771:12: error: 'struct backing_dev_info' has no member named 'nr_wb_ctx'
771 | bdi->nr_wb_ctx = nwritebacks;
| ^~
mm/page-writeback.c: In function 'bdi_set_nwritebacks':
mm/page-writeback.c:858:30: error: 'struct backing_dev_info' has no member named 'nr_wb_ctx'
858 | if (nwritebacks < bdi->nr_wb_ctx)
| ^~
--
In file included from mm/backing-dev.c:7:
>> include/linux/backing-dev.h:118:58: warning: 'struct bdi_writeback_ctx' declared inside parameter list will not be visible outside of this definition or declaration
118 | int bdi_wb_ctx_init(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx);
| ^~~~~~~~~~~~~~~~~
include/linux/backing-dev.h:119:59: warning: 'struct bdi_writeback_ctx' declared inside parameter list will not be visible outside of this definition or declaration
119 | void bdi_wb_ctx_exit(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx);
| ^~~~~~~~~~~~~~~~~
mm/backing-dev.c: In function 'nwritebacks_show':
>> mm/backing-dev.c:465:43: error: 'struct backing_dev_info' has no member named 'nr_wb_ctx'
465 | return sysfs_emit(buf, "%d\n", bdi->nr_wb_ctx);
| ^~
mm/backing-dev.c: At top level:
>> mm/backing-dev.c:1015:58: warning: 'struct bdi_writeback_ctx' declared inside parameter list will not be visible outside of this definition or declaration
1015 | int bdi_wb_ctx_init(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx)
| ^~~~~~~~~~~~~~~~~
>> mm/backing-dev.c:1015:5: error: conflicting types for 'bdi_wb_ctx_init'; have 'int(struct backing_dev_info *, struct bdi_writeback_ctx *)'
1015 | int bdi_wb_ctx_init(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx)
| ^~~~~~~~~~~~~~~
include/linux/backing-dev.h:118:5: note: previous declaration of 'bdi_wb_ctx_init' with type 'int(struct backing_dev_info *, struct bdi_writeback_ctx *)'
118 | int bdi_wb_ctx_init(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx);
| ^~~~~~~~~~~~~~~
In file included from include/linux/fs.h:16,
from include/linux/highmem.h:5,
from include/linux/bvec.h:10,
from include/linux/blk_types.h:10,
from include/linux/blkdev.h:9,
from mm/backing-dev.c:3:
mm/backing-dev.c: In function 'bdi_wb_ctx_init':
>> mm/backing-dev.c:1019:36: error: invalid use of undefined type 'struct bdi_writeback_ctx'
1019 | INIT_RADIX_TREE(&bdi_wb_ctx->cgwb_tree, GFP_ATOMIC);
| ^~
include/linux/radix-tree.h:84:51: note: in definition of macro 'INIT_RADIX_TREE'
84 | #define INIT_RADIX_TREE(root, mask) xa_init_flags(root, mask)
| ^~~~
In file included from include/linux/mm_types.h:13,
from include/linux/mmzone.h:22,
from include/linux/gfp.h:7,
from include/linux/xarray.h:16,
from include/linux/list_lru.h:14,
from include/linux/fs/super_types.h:7,
from include/linux/fs/super.h:5,
from include/linux/fs.h:5:
mm/backing-dev.c:1021:31: error: invalid use of undefined type 'struct bdi_writeback_ctx'
1021 | init_rwsem(&bdi_wb_ctx->wb_switch_rwsem);
| ^~
include/linux/rwsem.h:123:23: note: in definition of macro 'init_rwsem'
123 | __init_rwsem((sem), #sem, &__key); \
| ^~~
mm/backing-dev.c:1023:34: error: invalid use of undefined type 'struct bdi_writeback_ctx'
1023 | ret = wb_init(&bdi_wb_ctx->wb, bdi_wb_ctx, bdi, GFP_KERNEL);
| ^~
>> mm/backing-dev.c:1023:40: error: passing argument 2 of 'wb_init' from incompatible pointer type [-Wincompatible-pointer-types]
1023 | ret = wb_init(&bdi_wb_ctx->wb, bdi_wb_ctx, bdi, GFP_KERNEL);
| ^~~~~~~~~~
| |
| struct bdi_writeback_ctx *
mm/backing-dev.c:544:71: note: expected 'struct backing_dev_info *' but argument is of type 'struct bdi_writeback_ctx *'
544 | static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,
| ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
>> mm/backing-dev.c:1023:52: error: passing argument 3 of 'wb_init' makes integer from pointer without a cast [-Wint-conversion]
1023 | ret = wb_init(&bdi_wb_ctx->wb, bdi_wb_ctx, bdi, GFP_KERNEL);
| ^~~
| |
| struct backing_dev_info *
mm/backing-dev.c:545:26: note: expected 'gfp_t' {aka 'unsigned int'} but argument is of type 'struct backing_dev_info *'
545 | gfp_t gfp)
| ~~~~~~^~~
>> mm/backing-dev.c:1023:15: error: too many arguments to function 'wb_init'; expected 3, have 4
1023 | ret = wb_init(&bdi_wb_ctx->wb, bdi_wb_ctx, bdi, GFP_KERNEL);
| ^~~~~~~
mm/backing-dev.c:544:12: note: declared here
544 | static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,
| ^~~~~~~
mm/backing-dev.c:1025:27: error: invalid use of undefined type 'struct bdi_writeback_ctx'
1025 | bdi_wb_ctx->wb.memcg_css = &root_mem_cgroup->css;
| ^~
mm/backing-dev.c:1026:27: error: invalid use of undefined type 'struct bdi_writeback_ctx'
1026 | bdi_wb_ctx->wb.blkcg_css = blkcg_root_css;
| ^~
mm/backing-dev.c: At top level:
mm/backing-dev.c:1270:58: warning: 'struct bdi_writeback_ctx' declared inside parameter list will not be visible outside of this definition or declaration
1270 | int bdi_wb_ctx_init(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx)
| ^~~~~~~~~~~~~~~~~
mm/backing-dev.c:1270:5: error: conflicting types for 'bdi_wb_ctx_init'; have 'int(struct backing_dev_info *, struct bdi_writeback_ctx *)'
1270 | int bdi_wb_ctx_init(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx)
| ^~~~~~~~~~~~~~~
include/linux/backing-dev.h:118:5: note: previous declaration of 'bdi_wb_ctx_init' with type 'int(struct backing_dev_info *, struct bdi_writeback_ctx *)'
118 | int bdi_wb_ctx_init(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx);
| ^~~~~~~~~~~~~~~
mm/backing-dev.c: In function 'bdi_wb_ctx_init':
mm/backing-dev.c:1272:35: error: invalid use of undefined type 'struct bdi_writeback_ctx'
1272 | return wb_init(&bdi_wb_ctx->wb, bdi_wb_ctx, bdi, GFP_KERNEL);
| ^~
mm/backing-dev.c:1272:41: error: passing argument 2 of 'wb_init' from incompatible pointer type [-Wincompatible-pointer-types]
1272 | return wb_init(&bdi_wb_ctx->wb, bdi_wb_ctx, bdi, GFP_KERNEL);
| ^~~~~~~~~~
| |
| struct bdi_writeback_ctx *
mm/backing-dev.c:544:71: note: expected 'struct backing_dev_info *' but argument is of type 'struct bdi_writeback_ctx *'
544 | static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,
| ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
mm/backing-dev.c:1272:53: error: passing argument 3 of 'wb_init' makes integer from pointer without a cast [-Wint-conversion]
1272 | return wb_init(&bdi_wb_ctx->wb, bdi_wb_ctx, bdi, GFP_KERNEL);
| ^~~
| |
| struct backing_dev_info *
mm/backing-dev.c:545:26: note: expected 'gfp_t' {aka 'unsigned int'} but argument is of type 'struct backing_dev_info *'
545 | gfp_t gfp)
| ~~~~~~^~~
mm/backing-dev.c:1272:16: error: too many arguments to function 'wb_init'; expected 3, have 4
1272 | return wb_init(&bdi_wb_ctx->wb, bdi_wb_ctx, bdi, GFP_KERNEL);
| ^~~~~~~
mm/backing-dev.c:544:12: note: declared here
544 | static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,
| ^~~~~~~
mm/backing-dev.c: At top level:
mm/backing-dev.c:1275:59: warning: 'struct bdi_writeback_ctx' declared inside parameter list will not be visible outside of this definition or declaration
1275 | void bdi_wb_ctx_exit(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx)
| ^~~~~~~~~~~~~~~~~
>> mm/backing-dev.c:1275:6: error: conflicting types for 'bdi_wb_ctx_exit'; have 'void(struct backing_dev_info *, struct bdi_writeback_ctx *)'
1275 | void bdi_wb_ctx_exit(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx)
| ^~~~~~~~~~~~~~~
include/linux/backing-dev.h:119:6: note: previous declaration of 'bdi_wb_ctx_exit' with type 'void(struct backing_dev_info *, struct bdi_writeback_ctx *)'
119 | void bdi_wb_ctx_exit(struct backing_dev_info *bdi, struct bdi_writeback_ctx *bdi_wb_ctx);
| ^~~~~~~~~~~~~~~
mm/backing-dev.c: In function 'bdi_wb_ctx_exit':
mm/backing-dev.c:1277:32: error: invalid use of undefined type 'struct bdi_writeback_ctx'
1277 | wb_shutdown(&bdi_wb_ctx->wb);
| ^~
>> mm/backing-dev.c:1278:9: error: too many arguments to function 'cgwb_bdi_unregister'; expected 1, have 2
1278 | cgwb_bdi_unregister(bdi, bdi_wb_ctx);
| ^~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~
mm/backing-dev.c:881:13: note: declared here
881 | static void cgwb_bdi_unregister(struct backing_dev_info *bdi)
| ^~~~~~~~~~~~~~~~~~~
In file included from arch/powerpc/include/asm/bug.h:116,
from include/linux/bug.h:5,
from include/linux/instrumented.h:10,
from include/asm-generic/bitops/instrumented-atomic.h:14,
from arch/powerpc/include/asm/bitops.h:321,
from include/linux/bitops.h:67,
from include/linux/bitmap.h:8,
from include/linux/nodemask.h:91,
from include/linux/list_lru.h:12:
mm/backing-dev.c:1280:57: error: invalid use of undefined type 'struct bdi_writeback_ctx'
1280 | WARN_ON_ONCE(test_bit(WB_registered, &bdi_wb_ctx->wb.state));
| ^~
include/asm-generic/bug.h:120:32: note: in definition of macro 'WARN_ON_ONCE'
120 | int __ret_warn_on = !!(condition); \
| ^~~~~~~~~
include/linux/bitops.h:60:41: note: in expansion of macro 'bitop'
60 | #define test_bit(nr, addr) bitop(_test_bit, nr, addr)
| ^~~~~
mm/backing-dev.c:1280:22: note: in expansion of macro 'test_bit'
1280 | WARN_ON_ONCE(test_bit(WB_registered, &bdi_wb_ctx->wb.state));
| ^~~~~~~~
mm/backing-dev.c:1280:57: error: invalid use of undefined type 'struct bdi_writeback_ctx'
1280 | WARN_ON_ONCE(test_bit(WB_registered, &bdi_wb_ctx->wb.state));
| ^~
include/asm-generic/bug.h:120:32: note: in definition of macro 'WARN_ON_ONCE'
120 | int __ret_warn_on = !!(condition); \
| ^~~~~~~~~
include/linux/bitops.h:60:41: note: in expansion of macro 'bitop'
60 | #define test_bit(nr, addr) bitop(_test_bit, nr, addr)
| ^~~~~
mm/backing-dev.c:1280:22: note: in expansion of macro 'test_bit'
1280 | WARN_ON_ONCE(test_bit(WB_registered, &bdi_wb_ctx->wb.state));
| ^~~~~~~~
mm/backing-dev.c:1280:57: error: invalid use of undefined type 'struct bdi_writeback_ctx'
1280 | WARN_ON_ONCE(test_bit(WB_registered, &bdi_wb_ctx->wb.state));
| ^~
include/asm-generic/bug.h:120:32: note: in definition of macro 'WARN_ON_ONCE'
120 | int __ret_warn_on = !!(condition); \
| ^~~~~~~~~
include/linux/bitops.h:60:41: note: in expansion of macro 'bitop'
60 | #define test_bit(nr, addr) bitop(_test_bit, nr, addr)
| ^~~~~
mm/backing-dev.c:1280:22: note: in expansion of macro 'test_bit'
1280 | WARN_ON_ONCE(test_bit(WB_registered, &bdi_wb_ctx->wb.state));
| ^~~~~~~~
mm/backing-dev.c:1280:57: error: invalid use of undefined type 'struct bdi_writeback_ctx'
1280 | WARN_ON_ONCE(test_bit(WB_registered, &bdi_wb_ctx->wb.state));
| ^~
include/asm-generic/bug.h:120:32: note: in definition of macro 'WARN_ON_ONCE'
120 | int __ret_warn_on = !!(condition); \
| ^~~~~~~~~
include/linux/bitops.h:60:41: note: in expansion of macro 'bitop'
60 | #define test_bit(nr, addr) bitop(_test_bit, nr, addr)
| ^~~~~
mm/backing-dev.c:1280:22: note: in expansion of macro 'test_bit'
1280 | WARN_ON_ONCE(test_bit(WB_registered, &bdi_wb_ctx->wb.state));
| ^~~~~~~~
mm/backing-dev.c:1280:57: error: invalid use of undefined type 'struct bdi_writeback_ctx'
1280 | WARN_ON_ONCE(test_bit(WB_registered, &bdi_wb_ctx->wb.state));
| ^~
include/asm-generic/bug.h:120:32: note: in definition of macro 'WARN_ON_ONCE'
120 | int __ret_warn_on = !!(condition); \
| ^~~~~~~~~
include/linux/bitops.h:60:41: note: in expansion of macro 'bitop'
60 | #define test_bit(nr, addr) bitop(_test_bit, nr, addr)
| ^~~~~
mm/backing-dev.c:1280:22: note: in expansion of macro 'test_bit'
1280 | WARN_ON_ONCE(test_bit(WB_registered, &bdi_wb_ctx->wb.state));
| ^~~~~~~~
mm/backing-dev.c:1281:28: error: invalid use of undefined type 'struct bdi_writeback_ctx'
1281 | wb_exit(&bdi_wb_ctx->wb);
| ^~
vim +734 mm/page-writeback.c
724
725 static int __bdi_set_wb_ctx(struct backing_dev_info *bdi, int nwritebacks)
726 {
727 struct bdi_writeback_ctx **new_ctx_arr, **old_ctx_arr;
728 int i, ret;
729
730 new_ctx_arr = kcalloc(nwritebacks, sizeof(struct bdi_writeback_ctx *), GFP_KERNEL);
731 if (!new_ctx_arr)
732 return -ENOMEM;
733
> 734 for (i = 0; i < min(bdi->nr_wb_ctx, nwritebacks); i++)
> 735 new_ctx_arr[i] = bdi->wb_ctx_arr[i];
736
737 for (i = bdi->nr_wb_ctx; i < nwritebacks; i++) {
> 738 new_ctx_arr[i] = (struct bdi_writeback_ctx *)
> 739 kzalloc(sizeof(struct bdi_writeback_ctx), GFP_KERNEL);
740 if (!new_ctx_arr[i]) {
741 pr_err("Failed to allocate %d", i);
742 while (--i >= bdi->nr_wb_ctx)
743 kfree(new_ctx_arr[i]);
744 kfree(new_ctx_arr);
745 return -ENOMEM;
746 }
> 747 INIT_LIST_HEAD(&new_ctx_arr[i]->wb_list);
748 init_waitqueue_head(&new_ctx_arr[i]->wb_waitq);
749 }
750
751 for (i = bdi->nr_wb_ctx; i < nwritebacks; i++) {
> 752 ret = bdi_wb_ctx_init(bdi, new_ctx_arr[i]);
753 if (ret) {
754 while (--i >= bdi->nr_wb_ctx) {
> 755 bdi_wb_ctx_exit(bdi, new_ctx_arr[i]);
756 kfree(new_ctx_arr[i]);
757 }
758 kfree(new_ctx_arr);
759 return ret;
760 }
761 list_add_tail_rcu(&new_ctx_arr[i]->wb.bdi_node, &new_ctx_arr[i]->wb_list);
762 set_bit(WB_registered, &new_ctx_arr[i]->wb.state);
763 }
764
765 // Make sure the initialization is done before assignment
766 smp_wmb();
767
768 old_ctx_arr = bdi->wb_ctx_arr;
769 spin_lock_bh(&bdi_lock);
770 bdi->wb_ctx_arr = new_ctx_arr;
771 bdi->nr_wb_ctx = nwritebacks;
772 spin_unlock_bh(&bdi_lock);
773
774 kfree(old_ctx_arr);
775 return 0;
776 }
777
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next prev parent reply other threads:[~2026-08-13 10:49 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20250825123009epcas5p1573496e2cad2f58d22036493e5af03be@epcas5p1.samsung.com>
2025-08-25 12:29 ` [RFC 0/1] writeback: add sysfs to config the number of writeback contexts wangyufei
2025-08-25 12:29 ` [RFC 1/1] " wangyufei
2026-08-13 10:47 ` kernel test robot [this message]
2025-08-25 14:46 ` [RFC 0/1] " David Hildenbrand
2025-08-25 16:15 ` Matthew Wilcox
2025-08-29 8:59 ` Kundan Kumar
2025-09-02 11:19 ` wangyufei
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