Author: glebius
Date: Tue Oct 22 18:05:15 2019
New Revision: 353896
URL: https://svnweb.freebsd.org/changeset/base/353896
Log:
Allow epoch tracker to use the very last byte of the stack. Not sure
this will help to avoid panic in this function, since it will also use
some stack, but makes code more strict.
Submitted by: hselasky
Modified:
head/sys/kern/subr_epoch.c
Modified: head/sys/kern/subr_epoch.c
==============================================================================
--- head/sys/kern/subr_epoch.c Tue Oct 22 17:22:10 2019 (r353895)
+++ head/sys/kern/subr_epoch.c Tue Oct 22 18:05:15 2019 (r353896)
@@ -369,7 +369,7 @@ _epoch_enter_preempt(epoch_t epoch, epoch_tracker_t et
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);
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