[PATCH 4/4] mtd: nand: nandsim: convert to memalloc_noreclaim_*()

[Vlastimil Babka]

Nandsim has own functions set_memalloc() and clear_memalloc() for robust
setting and clearing of PF_MEMALLOC. Replace them by the new generic helpers.
No functional change.

Signed-off-by: Vlastimil Babka <vba...@suse.cz>
Cc: Boris Brezillon <boris.brezil...@free-electrons.com>
Cc: Richard Weinberger <rich...@nod.at>
---
 drivers/mtd/nand/nandsim.c | 29 +++++++++--------------------
 1 file changed, 9 insertions(+), 20 deletions(-)

diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index cef818f535ed..03a0d057bf2f 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -40,6 +40,7 @@
 #include <linux/list.h>
 #include <linux/random.h>
 #include <linux/sched.h>
+#include <linux/sched/mm.h>
 #include <linux/fs.h>
 #include <linux/pagemap.h>
 #include <linux/seq_file.h>
@@ -1368,31 +1369,18 @@ static int get_pages(struct nandsim *ns, struct file 
*file, size_t count, loff_t
        return 0;
 }
 
-static int set_memalloc(void)
-{
-       if (current->flags & PF_MEMALLOC)
-               return 0;
-       current->flags |= PF_MEMALLOC;
-       return 1;
-}
-
-static void clear_memalloc(int memalloc)
-{
-       if (memalloc)
-               current->flags &= ~PF_MEMALLOC;
-}
-
 static ssize_t read_file(struct nandsim *ns, struct file *file, void *buf, 
size_t count, loff_t pos)
 {
        ssize_t tx;
-       int err, memalloc;
+       int err;
+       unsigned int noreclaim_flag;
 
        err = get_pages(ns, file, count, pos);
        if (err)
                return err;
-       memalloc = set_memalloc();
+       noreclaim_flag = memalloc_noreclaim_save();
        tx = kernel_read(file, pos, buf, count);
-       clear_memalloc(memalloc);
+       memalloc_noreclaim_restore(noreclaim_flag);
        put_pages(ns);
        return tx;
 }
@@ -1400,14 +1388,15 @@ static ssize_t read_file(struct nandsim *ns, struct 
file *file, void *buf, size_
 static ssize_t write_file(struct nandsim *ns, struct file *file, void *buf, 
size_t count, loff_t pos)
 {
        ssize_t tx;
-       int err, memalloc;
+       int err;
+       unsigned int noreclaim_flag;
 
        err = get_pages(ns, file, count, pos);
        if (err)
                return err;
-       memalloc = set_memalloc();
+       noreclaim_flag = memalloc_noreclaim_save();
        tx = kernel_write(file, buf, count, pos);
-       clear_memalloc(memalloc);
+       memalloc_noreclaim_restore(noreclaim_flag);
        put_pages(ns);
        return tx;
 }
-- 
2.12.2

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