[PATCH v1 13/15] md/raid5-cache: Annotate pslot with __rcu notation

From: Logan Gunthorpe <logang@deltatee.com>
To: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org,
	Song Liu <song@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>,
	Guoqing Jiang <guoqing.jiang@linux.dev>, Xiao Ni <xni@redhat.com>,
	Stephen Bates <sbates@raithlin.com>,
	Martin Oliveira <Martin.Oliveira@eideticom.com>,
	David Sloan <David.Sloan@eideticom.com>,
	Logan Gunthorpe <logang@deltatee.com>
Subject: [PATCH v1 13/15] md/raid5-cache: Annotate pslot with __rcu notation
Date: Thu, 19 May 2022 13:13:09 -0600	[thread overview]
Message-ID: <20220519191311.17119-14-logang@deltatee.com> (raw)
In-Reply-To: <20220519191311.17119-1-logang@deltatee.com>

radix_tree_lookup_slot() and radix_tree_replace_slot() API expect the
slot returned and looked up to be marked with __rcu. Otherwise
sparse warnings are generated:

  drivers/md/raid5-cache.c:2939:23: warning: incorrect type in
			assignment (different address spaces)
  drivers/md/raid5-cache.c:2939:23:    expected void **pslot
  drivers/md/raid5-cache.c:2939:23:    got void [noderef] __rcu **

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
---
 drivers/md/raid5-cache.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index 1dbc7c4b9a15..a541d17f84f6 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -2683,7 +2683,7 @@ int r5c_try_caching_write(struct r5conf *conf,
 	int i;
 	struct r5dev *dev;
 	int to_cache = 0;
-	void **pslot;
+	void __rcu **pslot;
 	sector_t tree_index;
 	int ret;
 	uintptr_t refcount;
@@ -2850,7 +2850,7 @@ void r5c_finish_stripe_write_out(struct r5conf *conf,
 	int i;
 	int do_wakeup = 0;
 	sector_t tree_index;
-	void **pslot;
+	void __rcu **pslot;
 	uintptr_t refcount;
 
 	if (!log || !test_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags))
-- 
2.30.2

