lkml.org 
[lkml]   [2019]   [Dec]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/2] fs: nfs: dir.c: Fix sparse error
+Paul, here is the dependent patch for the list_prev_rcu() patch Madhuparna
posted.

On Fri, Dec 06, 2019 at 08:46:40PM +0530, madhuparnabhowmik04@gmail.com wrote:
> From: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>
>
> This patch fixes the following errors:
> fs/nfs/dir.c:2353:14: error: incompatible types in comparison expression (different address spaces):
> fs/nfs/dir.c:2353:14: struct list_head [noderef] <asn:4> *
> fs/nfs/dir.c:2353:14: struct list_head *
>
> caused due to directly accessing the prev pointer of
> a RCU protected list.
> Accessing the pointer using the macro list_prev_rcu() fixes this error.
>
> Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>
> ---
> fs/nfs/dir.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
> index e180033e35cf..2035254cc283 100644
> --- a/fs/nfs/dir.c
> +++ b/fs/nfs/dir.c
> @@ -2350,7 +2350,7 @@ static int nfs_access_get_cached_rcu(struct inode *inode, const struct cred *cre
> rcu_read_lock();
> if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS)
> goto out;
> - lh = rcu_dereference(nfsi->access_cache_entry_lru.prev);
> + lh = rcu_dereference(list_prev_rcu(&nfsi->access_cache_entry_lru));
> cache = list_entry(lh, struct nfs_access_entry, lru);
> if (lh == &nfsi->access_cache_entry_lru ||
> cred != cache->cred)
> --
> 2.17.1
>

\
 
 \ /
  Last update: 2019-12-06 17:01    [W:0.068 / U:0.588 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site