[PATCH] pblk: fix call_kern.cocci warnings

From: Julia Lawall
Date: Fri Feb 26 2016 - 15:57:25 EST


Convert GFP_KERNEL to GFP_ATOMIC in a function that may be called with
locks held.

See the call site on line 751, and the call to spin_lock on line 744.

Generated by: scripts/coccinelle/locks/call_kern.cocci

Signed-off-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Signed-off-by: Julia Lawall <julia.lawall@xxxxxxx>
---

Perhaps there is a way to reorganize the code such that pblk_get_blk is
not called under the lock.

tree: https://github.com/OpenChannelSSD/linux.git pblk
head: 01eab75e8310ada5c5d387ee0d77c9051f2ba238
commit: 8e755964c7e8b0266a95fb90557823dacf9da12f [11/21] pblk: do not use
mempool for write buffer allocation

pblk.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/lightnvm/pblk.c
+++ b/drivers/lightnvm/pblk.c
@@ -282,14 +282,14 @@ static struct pblk_block *pblk_get_blk(s
void *data;
int nentries = dev->sec_per_blk;

- data = kmalloc(dev->sec_per_blk * dev->sec_size, GFP_KERNEL);
+ data = kmalloc(dev->sec_per_blk * dev->sec_size, GFP_ATOMIC);
if (!data) {
pr_err("nvm: pblk: cannot allocate write buffer for block\n");
return NULL;
}

entries = kmalloc(dev->sec_per_blk * sizeof(struct buf_entry),
- GFP_KERNEL);
+ GFP_ATOMIC);
if (!entries) {
pr_err("nvm: pblk: cannot allocate write buffer for block\n");
kfree(data);
@@ -297,7 +297,7 @@ static struct pblk_block *pblk_get_blk(s
}

sync_bitmap = kmalloc(BITS_TO_LONGS(nentries) * sizeof(unsigned long),
- GFP_KERNEL);
+ GFP_ATOMIC);
if (!sync_bitmap) {
kfree(data);
kfree(entries);