From 6ed2288ca93479f801f49daf9b6d674701f4c28e Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 30 Jan 2017 22:28:31 -0500
Subject: [PATCH] vchiq_2835_arm: switch to get_user_pages_fast()
Git-commit: 6ed2288ca93479f801f49daf9b6d674701f4c28e
Patch-mainline: v4.15-rc1
References: FATE#324827
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c | 20 +++-------
1 file changed, 7 insertions(+), 13 deletions(-)
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
@@ -90,8 +90,7 @@ static irqreturn_t
vchiq_doorbell_irq(int irq, void *dev_id);
static struct vchiq_pagelist_info *
-create_pagelist(char __user *buf, size_t count, unsigned short type,
- struct task_struct *task);
+create_pagelist(char __user *buf, size_t count, unsigned short type);
static void
free_pagelist(struct vchiq_pagelist_info *pagelistinfo,
@@ -255,8 +254,7 @@ vchiq_prepare_bulk_data(VCHIQ_BULK_T *bu
pagelistinfo = create_pagelist((char __user *)offset, size,
(dir == VCHIQ_BULK_RECEIVE)
? PAGELIST_READ
- : PAGELIST_WRITE,
- current);
+ : PAGELIST_WRITE);
if (!pagelistinfo)
return VCHIQ_ERROR;
@@ -395,8 +393,7 @@ cleanup_pagelistinfo(struct vchiq_pageli
*/
static struct vchiq_pagelist_info *
-create_pagelist(char __user *buf, size_t count, unsigned short type,
- struct task_struct *task)
+create_pagelist(char __user *buf, size_t count, unsigned short type)
{
PAGELIST_T *pagelist;
struct vchiq_pagelist_info *pagelistinfo;
@@ -476,14 +473,11 @@ create_pagelist(char __user *buf, size_t
}
/* do not try and release vmalloc pages */
} else {
- down_read(&task->mm->mmap_sem);
- actual_pages = get_user_pages(
- (unsigned long)buf & PAGE_MASK,
+ actual_pages = get_user_pages_fast(
+ (unsigned long)buf & PAGE_MASK,
num_pages,
- (type == PAGELIST_READ) ? FOLL_WRITE : 0,
- pages,
- NULL /*vmas */);
- up_read(&task->mm->mmap_sem);
+ type == PAGELIST_READ,
+ pages);
if (actual_pages != num_pages) {
vchiq_log_info(vchiq_arm_log_level,