[PATCH 17/18] fsverity: remove system-wide workqueue

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Now that we've made the verity workqueue per-superblock, we don't need
the systemwide workqueue.  Get rid of the old implementation.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 fs/verity/fsverity_private.h |    2 --
 fs/verity/init.c             |    1 -
 fs/verity/verify.c           |   21 +--------------------
 3 files changed, 1 insertion(+), 23 deletions(-)


diff --git a/fs/verity/fsverity_private.h b/fs/verity/fsverity_private.h
index 20208425e56fc..b6273615f76af 100644
--- a/fs/verity/fsverity_private.h
+++ b/fs/verity/fsverity_private.h
@@ -155,8 +155,6 @@ static inline void fsverity_init_signature(void)
 
 /* verify.c */
 
-void __init fsverity_init_workqueue(void);
-
 int fsverity_read_merkle_tree_block(struct inode *inode,
 				    const struct merkle_tree_params *params,
 				    int level, u64 pos, unsigned long ra_bytes,
diff --git a/fs/verity/init.c b/fs/verity/init.c
index 3769d2dc9e3b4..4663696c6996c 100644
--- a/fs/verity/init.c
+++ b/fs/verity/init.c
@@ -66,7 +66,6 @@ static int __init fsverity_init(void)
 {
 	fsverity_check_hash_algs();
 	fsverity_init_info_cache();
-	fsverity_init_workqueue();
 	fsverity_init_sysctl();
 	fsverity_init_signature();
 	fsverity_init_bpf();
diff --git a/fs/verity/verify.c b/fs/verity/verify.c
index e1fab60303d6d..a30eac895338e 100644
--- a/fs/verity/verify.c
+++ b/fs/verity/verify.c
@@ -10,8 +10,6 @@
 #include <crypto/hash.h>
 #include <linux/bio.h>
 
-static struct workqueue_struct *fsverity_read_workqueue;
-
 /*
  * Returns true if the hash @block with index @hblock_idx in the merkle tree
  * for @inode has already been verified.
@@ -375,27 +373,10 @@ EXPORT_SYMBOL_GPL(fsverity_init_wq);
 void fsverity_enqueue_verify_work(struct super_block *sb,
 				  struct work_struct *work)
 {
-	queue_work(sb->s_verity_wq ?: fsverity_read_workqueue, work);
+	queue_work(sb->s_verity_wq, work);
 }
 EXPORT_SYMBOL_GPL(fsverity_enqueue_verify_work);
 
-void __init fsverity_init_workqueue(void)
-{
-	/*
-	 * Use a high-priority workqueue to prioritize verification work, which
-	 * blocks reads from completing, over regular application tasks.
-	 *
-	 * For performance reasons, don't use an unbound workqueue.  Using an
-	 * unbound workqueue for crypto operations causes excessive scheduler
-	 * latency on ARM64.
-	 */
-	fsverity_read_workqueue = alloc_workqueue("fsverity_read_queue",
-						  WQ_HIGHPRI,
-						  num_online_cpus());
-	if (!fsverity_read_workqueue)
-		panic("failed to allocate fsverity_read_queue");
-}
-
 /**
  * fsverity_read_merkle_tree_block() - read Merkle tree block
  * @inode: inode to which this Merkle tree block belongs