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stm class: Use vmalloc for the master map

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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@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
CC: stable@vger.kernel.org # v4.4+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Shishkin 2018-05-24 11:27:26 +03:00 committed by Greg Kroah-Hartman
parent dd010bd7af
commit b5e2ced9bf
1 changed files with 3 additions and 3 deletions
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6
drivers/hwtracing/stm/core.c
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@ -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;
}