[tip/core/rcu,05/10] rcu: Fix kfree_rcu() docbook errors
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Message ID 20210304000019.22459-5-paulmck@kernel.org
State In Next
Commit 2277fa4d0afb2585ca2a5809f3417c5857cea0c7
Headers show
  • Miscellaneous fixes for v5.13
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Commit Message

Paul E. McKenney March 4, 2021, midnight UTC
From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

After commit 5130b8fd0690 ("rcu: Introduce kfree_rcu() single-argument macro"),
kernel-doc now emits two warnings:

	./include/linux/rcupdate.h:884: warning: Excess function parameter 'ptr' description in 'kfree_rcu'
	./include/linux/rcupdate.h:884: warning: Excess function parameter 'rhf' description in 'kfree_rcu'

This commit added some macro magic in order to call two different versions
of kfree_rcu(), the first having just one argument and the second having
two arguments.  That makes it difficult to document the kfree_rcu() arguments
in the docboook header.

In order to make clearer that this macro accepts optional arguments,
this commit uses macro concatenation so that this macro changes from:
	#define kfree_rcu kvfree_rcu

	#define kfree_rcu(ptr, rhf...) kvfree_rcu(ptr, ## rhf)

That not only helps kernel-doc understand the macro arguments, but also
provides a better C definition that makes clearer that the first argument
is mandatory and the second one is optional.

Fixes: 5130b8fd0690 ("rcu: Introduce kfree_rcu() single-argument macro")
Tested-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
 include/linux/rcupdate.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index bd04f72..5cc6dea 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -881,7 +881,7 @@  static inline notrace void rcu_read_unlock_sched_notrace(void)
  * The BUILD_BUG_ON check must not involve any function calls, hence the
  * checks are done in macros here.
-#define kfree_rcu kvfree_rcu
+#define kfree_rcu(ptr, rhf...) kvfree_rcu(ptr, ## rhf)
  * kvfree_rcu() - kvfree an object after a grace period.