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From efd6f660496f4a70e788963b4b914791eed32c42 Mon Sep 17 00:00:00 2001
From: Clark Williams <williams@redhat.com>
Date: Tue, 3 Jul 2018 13:34:30 -0500
Subject: [PATCH 015/347] fscache: initialize cookie hash table raw spinlocks
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
The fscache cookie mechanism uses a hash table of hlist_bl_head structures. The
PREEMPT_RT patcheset adds a raw spinlock to this structure and so on PREEMPT_RT
the structures get used uninitialized, causing warnings about bad magic numbers
when spinlock debugging is turned on.
Use the init function for fscache cookies.
Signed-off-by: Clark Williams <williams@redhat.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
fs/fscache/cookie.c | 8 ++++++++
fs/fscache/main.c | 1 +
include/linux/fscache.h | 1 +
3 files changed, 10 insertions(+)
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index 2ff05adfc22a..b2b9a85a4ba5 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -950,3 +950,11 @@ int __fscache_check_consistency(struct fscache_cookie *cookie,
return -ESTALE;
}
EXPORT_SYMBOL(__fscache_check_consistency);
+
+void __init fscache_cookie_init(void)
+{
+ int i;
+
+ for (i = 0; i < (1 << fscache_cookie_hash_shift) - 1; i++)
+ INIT_HLIST_BL_HEAD(&fscache_cookie_hash[i]);
+}
diff --git a/fs/fscache/main.c b/fs/fscache/main.c
index aa49234e9520..95a0798de381 100644
--- a/fs/fscache/main.c
+++ b/fs/fscache/main.c
@@ -188,6 +188,7 @@ static int __init fscache_init(void)
ret = -ENOMEM;
goto error_cookie_jar;
}
+ fscache_cookie_init();
fscache_root = kobject_create_and_add("fscache", kernel_kobj);
if (!fscache_root)
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index 84b90a79d75a..87a9330eafa2 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -230,6 +230,7 @@ extern void __fscache_readpages_cancel(struct fscache_cookie *cookie,
extern void __fscache_disable_cookie(struct fscache_cookie *, const void *, bool);
extern void __fscache_enable_cookie(struct fscache_cookie *, const void *, loff_t,
bool (*)(void *), void *);
+extern void fscache_cookie_init(void);
/**
* fscache_register_netfs - Register a filesystem as desiring caching services
--
2.36.1
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