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linuxkpi: Implement rcu_replace_pointer() macro

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This is needed for the drm-kmod 5.5 update.

Reviewed by:		hselasky (src)
MFC after:		3 days
Differential Revision:	https://reviews.freebsd.org/D30025
This commit is contained in:
Neel Chauhan 2021-04-28 08:04:52 -07:00
parent d1e9441583
commit efe7f12cd3
1 changed files with 7 additions and 0 deletions

7
sys/compat/linuxkpi/common/include/linux/rcupdate.h

@ -97,6 +97,13 @@
(uintptr_t)(v)); \
} while (0)
#define rcu_replace_pointer(rcu, ptr, c) \
({ \
typeof(ptr) __tmp = rcu_dereference_protected(rcu, c); \
rcu_assign_pointer(rcu, ptr); \
__tmp; \
})
#define rcu_swap_protected(rcu, ptr, c) do { \
typeof(ptr) p = rcu_dereference_protected(rcu, c); \
rcu_assign_pointer(rcu, ptr); \