git: 89f8a8c30632 - stable/13 - LinuxKPI: add rcu_dereference_check()

[Bjoern A. Zeeb]

The branch stable/13 has been updated by bz:

URL: https://cgit.FreeBSD.org/src/commit/?id=89f8a8c30632c09e15d11456469a32cdc9e06d19

commit 89f8a8c30632c09e15d11456469a32cdc9e06d19
Author:     Bjoern A. Zeeb <bz at FreeBSD.org>
AuthorDate: 2021-05-24 18:40:42 +0000
Commit:     Bjoern A. Zeeb <bz at FreeBSD.org>
CommitDate: 2021-07-18 00:35:00 +0000

    LinuxKPI: add rcu_dereference_check()
    
    Add a define for rcu_dereference_check() to rcu_dereference_protected()
    which ignores the check argument.  Our lockdep compat implementation
    for use cases found in iwlwifi would return 1 anyway.
    
    Sponsored by:   The FreeBSD Foundation
    Reviewed by:    hselasky
    Differential Revision: https://reviews.freebsd.org/D30436
    
    (cherry picked from commit fa58da02f708a22200a89032b8eaf35e1c8ef4a6)
---
 sys/compat/linuxkpi/common/include/linux/rcupdate.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/compat/linuxkpi/common/include/linux/rcupdate.h b/sys/compat/linuxkpi/common/include/linux/rcupdate.h
index ea97fecee53b..bd8335216d1d 100644
--- a/sys/compat/linuxkpi/common/include/linux/rcupdate.h
+++ b/sys/compat/linuxkpi/common/include/linux/rcupdate.h
@@ -87,6 +87,9 @@
 #define	rcu_dereference(p)			\
 	rcu_dereference_protected(p, 0)
 
+#define	rcu_dereference_check(p, c)		\
+	rcu_dereference_protected(p, c)
+
 #define	rcu_dereference_raw(p)			\
 	((__typeof(*p) *)READ_ONCE(p))