git: c91bf3cb34f0 - stable/13 - epoch: replace hand coded assertion

The branch stable/13 has been updated by brooks:

URL: https://cgit.FreeBSD.org/src/commit/?id=c91bf3cb34f0c1238a70e674bf23f89cccddfaec

commit c91bf3cb34f0c1238a70e674bf23f89cccddfaec
Author:     Brooks Davis <brooks@FreeBSD.org>
AuthorDate: 2023-01-20 18:03:39 +0000
Commit:     Brooks Davis <brooks@FreeBSD.org>
CommitDate: 2023-01-24 22:46:31 +0000

    epoch: replace hand coded assertion
    
    The assertion is equivalent to kstack_contains() so use that rather
    than spelling it out.
    
    Suggested by:   jhb
    Reviewed by:    jhb
    MFC after:      1 week
    Sponsored by:   DARPA, AFRL
    Differential Revision:  https://reviews.freebsd.org/D38107
    
    (cherry picked from commit fa1d803c0f652d72840a3c59139baf9d30792860)
---
 sys/kern/subr_epoch.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/sys/kern/subr_epoch.c b/sys/kern/subr_epoch.c
index 651fd8b419f0..7d4457428bc8 100644
--- a/sys/kern/subr_epoch.c
+++ b/sys/kern/subr_epoch.c
@@ -443,9 +443,7 @@ _epoch_enter_preempt(epoch_t epoch, epoch_tracker_t et EPOCH_FILE_LINE)
 
 	MPASS(cold || epoch != NULL);
 	td = curthread;
-	MPASS((vm_offset_t)et >= td->td_kstack &&
-	    (vm_offset_t)et + sizeof(struct epoch_tracker) <=
-	    td->td_kstack + td->td_kstack_pages * PAGE_SIZE);
+	MPASS(kstack_contains(td, (vm_offset_t)et, sizeof(*et)));
 
 	INIT_CHECK(epoch);
 	MPASS(epoch->e_flags & EPOCH_PREEMPT);