* [arm-integrator:b4/aarch64-dynamic-kernel-stacks-v7.0-rc1 7/13] kernel/fork.c:260:28: error: use of undeclared identifier 'THREAD_PREALLOC_PAGES'
@ 2026-03-13 7:09 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2026-03-13 7:09 UTC (permalink / raw)
To: Pasha Tatashin; +Cc: llvm, oe-kbuild-all, Linus Walleij
tree: https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator.git b4/aarch64-dynamic-kernel-stacks-v7.0-rc1
head: 3ea8b0381a0759fa0c71abae5274db2414b58e78
commit: d2ee0928bdd182aed09a1eabb9c008eef73bb442 [7/13] fork: Dynamic Kernel Stacks
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260313/202603130843.MyLfc9hR-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260313/202603130843.MyLfc9hR-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/202603130843.MyLfc9hR-lkp@intel.com/
All errors (new ones prefixed by >>):
>> kernel/fork.c:260:28: error: use of undeclared identifier 'THREAD_PREALLOC_PAGES'
260 | if (vm_area->nr_pages > THREAD_PREALLOC_PAGES)
| ^
1 error generated.
vim +/THREAD_PREALLOC_PAGES +260 kernel/fork.c
238
239 static bool try_release_thread_stack_to_cache(struct vm_struct *vm_area)
240 {
241 unsigned int i;
242 int nid;
243
244 /*
245 * Don't cache stacks if any of the pages don't match the local domain, unless
246 * there is no local memory to begin with.
247 *
248 * Note that lack of local memory does not automatically mean it makes no difference
249 * performance-wise which other domain backs the stack. In this case we are merely
250 * trying to avoid constantly going to vmalloc.
251 */
252 scoped_guard(preempt) {
253 if (IS_ENABLED(CONFIG_DYNAMIC_STACK)) {
254 /*
255 * If we have faulted in more than the default number of
256 * stack pages to a stack, don't re-use it. This makes sure
257 * a process never use more than THREAD_PREALLOC_PAGES
258 * at the outset.
259 */
> 260 if (vm_area->nr_pages > THREAD_PREALLOC_PAGES)
261 return false;
262 }
263 nid = numa_node_id();
264 if (node_state(nid, N_MEMORY)) {
265 for (i = 0; i < vm_area->nr_pages; i++) {
266 struct page *page = vm_area->pages[i];
267 if (page_to_nid(page) != nid)
268 return false;
269 }
270 }
271
272 for (i = 0; i < NR_CACHED_STACKS; i++) {
273 struct vm_struct *tmp = NULL;
274
275 if (this_cpu_try_cmpxchg(cached_stacks[i], &tmp, vm_area))
276 return true;
277 }
278 }
279 return false;
280 }
281
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
* [arm-integrator:b4/aarch64-dynamic-kernel-stacks-v7.0-rc1 7/13] kernel/fork.c:260:28: error: use of undeclared identifier 'THREAD_PREALLOC_PAGES'
@ 2026-03-16 5:35 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2026-03-16 5:35 UTC (permalink / raw)
To: Pasha Tatashin; +Cc: llvm, oe-kbuild-all, Linus Walleij
tree: https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator.git b4/aarch64-dynamic-kernel-stacks-v7.0-rc1
head: 3ea8b0381a0759fa0c71abae5274db2414b58e78
commit: d2ee0928bdd182aed09a1eabb9c008eef73bb442 [7/13] fork: Dynamic Kernel Stacks
config: s390-allnoconfig (https://download.01.org/0day-ci/archive/20260316/202603161308.popksHjh-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project f46a5153850c1303d687233d4adf699b01041da8)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260316/202603161308.popksHjh-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/202603161308.popksHjh-lkp@intel.com/
All errors (new ones prefixed by >>):
>> kernel/fork.c:260:28: error: use of undeclared identifier 'THREAD_PREALLOC_PAGES'
260 | if (vm_area->nr_pages > THREAD_PREALLOC_PAGES)
| ^~~~~~~~~~~~~~~~~~~~~
1 error generated.
vim +/THREAD_PREALLOC_PAGES +260 kernel/fork.c
238
239 static bool try_release_thread_stack_to_cache(struct vm_struct *vm_area)
240 {
241 unsigned int i;
242 int nid;
243
244 /*
245 * Don't cache stacks if any of the pages don't match the local domain, unless
246 * there is no local memory to begin with.
247 *
248 * Note that lack of local memory does not automatically mean it makes no difference
249 * performance-wise which other domain backs the stack. In this case we are merely
250 * trying to avoid constantly going to vmalloc.
251 */
252 scoped_guard(preempt) {
253 if (IS_ENABLED(CONFIG_DYNAMIC_STACK)) {
254 /*
255 * If we have faulted in more than the default number of
256 * stack pages to a stack, don't re-use it. This makes sure
257 * a process never use more than THREAD_PREALLOC_PAGES
258 * at the outset.
259 */
> 260 if (vm_area->nr_pages > THREAD_PREALLOC_PAGES)
261 return false;
262 }
263 nid = numa_node_id();
264 if (node_state(nid, N_MEMORY)) {
265 for (i = 0; i < vm_area->nr_pages; i++) {
266 struct page *page = vm_area->pages[i];
267 if (page_to_nid(page) != nid)
268 return false;
269 }
270 }
271
272 for (i = 0; i < NR_CACHED_STACKS; i++) {
273 struct vm_struct *tmp = NULL;
274
275 if (this_cpu_try_cmpxchg(cached_stacks[i], &tmp, vm_area))
276 return true;
277 }
278 }
279 return false;
280 }
281
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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