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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Wed, 13 Sep 2017 12:32:34 +0200
Subject: [PATCH 171/351] fs/dcache: bring back explicit INIT_HLIST_BL_HEAD
init
Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=fa1bbdefa768d6776aa9355dbf060438c97cf3c8
Commit 3d375d78593c ("mm: update callers to use HASH_ZERO flag") removed
INIT_HLIST_BL_HEAD and uses the ZERO flag instead for the init. However
on RT we have also a spinlock which needs an init call so we can't use
that.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
fs/dcache.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/fs/dcache.c b/fs/dcache.c
index 1897833a4668..b5e53587d14b 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -3077,6 +3077,8 @@ __setup("dhash_entries=", set_dhash_entries);
static void __init dcache_init_early(void)
{
+ unsigned int loop;
+
/* If hashes are distributed across NUMA nodes, defer
* hash allocation until vmalloc space is available.
*/
@@ -3093,11 +3095,16 @@ static void __init dcache_init_early(void)
NULL,
0,
0);
+
+ for (loop = 0; loop < (1U << d_hash_shift); loop++)
+ INIT_HLIST_BL_HEAD(dentry_hashtable + loop);
+
d_hash_shift = 32 - d_hash_shift;
}
static void __init dcache_init(void)
{
+ unsigned int loop;
/*
* A constructor could be added for stable state like the lists,
* but it is probably not worth it because of the cache nature
@@ -3121,6 +3128,10 @@ static void __init dcache_init(void)
NULL,
0,
0);
+
+ for (loop = 0; loop < (1U << d_hash_shift); loop++)
+ INIT_HLIST_BL_HEAD(dentry_hashtable + loop);
+
d_hash_shift = 32 - d_hash_shift;
}
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