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SubjectRe: [PATCH 1/1] stackdepot: ignore junk last entry in case of switch from user mode.
Hi Maninder,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.14-rc4 next-20171013]
[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/Maninder-Singh/stackdepot-ignore-junk-last-entry-in-case-of-switch-from-user-mode/20171014-153544
config: xtensa-allyesconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 4.9.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=xtensa

All errors (new ones prefixed by >>):

lib/stackdepot.c: In function 'depot_save_stack':
>> lib/stackdepot.c:217:46: error: 'MODULES_VADDR' undeclared (first use in this function)
if (trace->entries[trace->nr_entries - 1] < MODULES_VADDR) {
^
lib/stackdepot.c:217:46: note: each undeclared identifier is reported only once for each function it appears in

vim +/MODULES_VADDR +217 lib/stackdepot.c

196
197 /**
198 * depot_save_stack - save stack in a stack depot.
199 * @trace - the stacktrace to save.
200 * @alloc_flags - flags for allocating additional memory if required.
201 *
202 * Returns the handle of the stack struct stored in depot.
203 */
204 depot_stack_handle_t depot_save_stack(struct stack_trace *trace,
205 gfp_t alloc_flags)
206 {
207 u32 hash;
208 depot_stack_handle_t retval = 0;
209 struct stack_record *found = NULL, **bucket;
210 unsigned long flags;
211 struct page *page = NULL;
212 void *prealloc = NULL;
213
214 if (unlikely(trace->nr_entries == 0))
215 goto fast_exit;
216
> 217 if (trace->entries[trace->nr_entries - 1] < MODULES_VADDR) {

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