Fengguang is running into a warning from the buddy allocator:
> swapper/0: page allocation failure: order:9, mode:0x14040c0(GFP_KERNEL|__GFP_COMP), nodemask=(null)
> CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.17.0-rc1 #262
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
> Call Trace:
...
> __kmalloc+0x14b/0x180: ____cache_alloc at mm/slab.c:3127
> stm_register_device+0xf3/0x5c0: stm_register_device at drivers/hwtracing/stm/core.c:695
...
Which is basically a result of the stm class trying to allocate ~512kB
for the dummy_stm with its default parameters. There's no reason, however,
for it not to be vmalloc()ed instead, which is what this patch does.
Reported-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
CC: stable@xxxxxxxxxxxxxxx # v4.4+
---
drivers/hwtracing/stm/core.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index 05386b76465e..657badb479a5 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -674,7 +674,7 @@ static void stm_device_release(struct device *dev)
{
struct stm_device *stm = to_stm_device(dev);
- kfree(stm);
+ vfree(stm);
}
int stm_register_device(struct device *parent, struct stm_data *stm_data,
@@ -691,7 +691,7 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
return -EINVAL;
nmasters = stm_data->sw_end - stm_data->sw_start + 1;
- stm = kzalloc(sizeof(*stm) + nmasters * sizeof(void *), GFP_KERNEL);
+ stm = vzalloc(sizeof(*stm) + nmasters * sizeof(void *));
if (!stm)
return -ENOMEM;
@@ -744,7 +744,7 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
/* matches device_initialize() above */
put_device(&stm->dev);
err_free:
- kfree(stm);
+ vfree(stm);
return err;
}
--
2.17.0
