linux-kernel - [PATCH 3.16 12/99] padata: purge get_cpu and reorder_via_wq from padata_do

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Message-ID: <lsq.1589984008.991014456@decadent.org.uk>
Date:   Wed, 20 May 2020 15:13:40 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Steffen Klassert" <steffen.klassert@...unet.com>,
        linux-crypto@...r.kernel.org,
        "Herbert Xu" <herbert@...dor.apana.org.au>,
        "Daniel Jordan" <daniel.m.jordan@...cle.com>
Subject: [PATCH 3.16 12/99] padata: purge get_cpu and reorder_via_wq from
 padata_do_serial

3.16.84-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel Jordan <daniel.m.jordan@...cle.com>

commit 065cf577135a4977931c7a1e1edf442bfd9773dd upstream.

With the removal of the padata timer, padata_do_serial no longer
needs special CPU handling, so remove it.

Signed-off-by: Daniel Jordan <daniel.m.jordan@...cle.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: Steffen Klassert <steffen.klassert@...unet.com>
Cc: linux-crypto@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 kernel/padata.c | 23 +++--------------------
 1 file changed, 3 insertions(+), 20 deletions(-)

--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -322,24 +322,9 @@ static void padata_serial_worker(struct
  */
 void padata_do_serial(struct padata_priv *padata)
 {
-	int cpu;
-	struct padata_parallel_queue *pqueue;
-	struct parallel_data *pd;
-	int reorder_via_wq = 0;
-
-	pd = padata->pd;
-
-	cpu = get_cpu();
-
-	/* We need to enqueue the padata object into the correct
-	 * per-cpu queue.
-	 */
-	if (cpu != padata->cpu) {
-		reorder_via_wq = 1;
-		cpu = padata->cpu;
-	}
-
-	pqueue = per_cpu_ptr(pd->pqueue, cpu);
+	struct parallel_data *pd = padata->pd;
+	struct padata_parallel_queue *pqueue = per_cpu_ptr(pd->pqueue,
+							   padata->cpu);
 
 	spin_lock(&pqueue->reorder.lock);
 	list_add_tail(&padata->list, &pqueue->reorder.list);
@@ -353,8 +338,6 @@ void padata_do_serial(struct padata_priv
 	 */
 	smp_mb__after_atomic();
 
-	put_cpu();
-
 	padata_reorder(pd);
 }
 EXPORT_SYMBOL(padata_do_serial);