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Allow epoch tracker to use the very last byte of the stack. Not sure

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this will help to avoid panic in this function, since it will also use
some stack, but makes code more strict.

Submitted by:	hselasky
This commit is contained in:
glebius 2019-10-22 18:05:15 +00:00
parent 9582ed1083
commit 10ee156a04
1 changed files with 1 additions and 1 deletions
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2
sys/kern/subr_epoch.c
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@ -369,7 +369,7 @@ _epoch_enter_preempt(epoch_t epoch, epoch_tracker_t et EPOCH_FILE_LINE)
MPASS(epoch->e_flags & EPOCH_PREEMPT);
td = curthread;
MPASS((vm_offset_t)et >= td->td_kstack &&
(vm_offset_t)et + sizeof(struct epoch_tracker) <
(vm_offset_t)et + sizeof(struct epoch_tracker) <=
td->td_kstack + td->td_kstack_pages * PAGE_SIZE);
INIT_CHECK(epoch);