From: Clark Williams <[email protected]> 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 <[email protected]> Signed-off-by: Sebastian Andrzej Siewior <[email protected]> --- 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 97137d7ec5ee..acdf749c2d0d 100644 --- a/fs/fscache/cookie.c +++ b/fs/fscache/cookie.c @@ -972,3 +972,11 @@ 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 7dce110bf17d..9f0464ab2484 100644 --- a/fs/fscache/main.c +++ b/fs/fscache/main.c @@ -151,6 +151,7 @@ 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 -- 2.18.0 -- Linux-cachefs mailing list [email protected] https://www.redhat.com/mailman/listinfo/linux-cachefs
