linux-kernel - Re: [PATCH] staging: unisys: use kzalloc instead of kmalloc/memset 0

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Date:	Tue, 18 Mar 2014 09:26:07 +0900
From:	DaeSeok Youn <daeseok.youn@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	jkc@...hat.com, devel <devel@...verdev.osuosl.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: unisys: use kzalloc instead of kmalloc/memset 0

I think vmalloc/kmalloc in uislib_malloc() can be removed and just use
vmalloc/kmalloc directly.
(UISMALLOC() macro is also removed.)
And uislib_malloc() is renamed to "uislib_trace_buffer_status()" which
is just tracing buffer status(Malloc_FailuresAlloc, Malloc_BytesInUse
...) for info_proc_read_helper().

If this change is accepted, it also need to change uislib_free().

Is it fine to change like this?

Thanks.
Daeseok Youn.

2014-03-18 6:41 GMT+09:00 Greg KH <gregkh@...uxfoundation.org>:
> On Wed, Mar 12, 2014 at 07:37:50PM +0900, Daeseok Youn wrote:
>>
>> Signed-off-by: Daeseok Youn <daeseok.youn@...il.com>
>> ---
>>  drivers/staging/unisys/uislib/uislib.c   |    5 +----
>>  drivers/staging/unisys/uislib/uisutils.c |    2 +-
>>  2 files changed, 2 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/staging/unisys/uislib/uislib.c b/drivers/staging/unisys/uislib/uislib.c
>> index d77df9a..9748fcb 100644
>> --- a/drivers/staging/unisys/uislib/uislib.c
>> +++ b/drivers/staging/unisys/uislib/uislib.c
>> @@ -339,8 +339,6 @@ create_bus(CONTROLVM_MESSAGE *msg, char *buf)
>>               return CONTROLVM_RESP_ERROR_KMALLOC_FAILED;
>>       }
>>
>> -     memset(bus, 0, size);
>> -
>>       /* Currently by default, the bus Number is the GuestHandle.
>>        * Configure Bus message can override this.
>>        */
>> @@ -530,7 +528,6 @@ create_device(CONTROLVM_MESSAGE *msg, char *buf)
>>               return CONTROLVM_RESP_ERROR_KMALLOC_FAILED;
>>       }
>>
>> -     memset(dev, 0, sizeof(struct device_info));
>>       dev->channelTypeGuid = msg->cmd.createDevice.dataTypeGuid;
>>       dev->intr = msg->cmd.createDevice.intr;
>>       dev->channelAddr = msg->cmd.createDevice.channelAddr;
>> @@ -1437,7 +1434,7 @@ uislib_malloc(size_t siz, gfp_t gfp, U8 contiguous, char *fn, int ln)
>>               * get memory for you (like, invoke oom killer), which
>>               * will probably cripple the system.
>>               */
>> -             p = kmalloc(siz, gfp | __GFP_NORETRY);
>> +             p = kzalloc(siz, gfp | __GFP_NORETRY);
>>       }
>>       if (p == NULL) {
>>               LOGERR("uislib_malloc failed to alloc %d bytes @%s:%d",
>> diff --git a/drivers/staging/unisys/uislib/uisutils.c b/drivers/staging/unisys/uislib/uisutils.c
>> index 208b7ea..2f05be1 100644
>> --- a/drivers/staging/unisys/uislib/uisutils.c
>> +++ b/drivers/staging/unisys/uislib/uisutils.c
>> @@ -294,7 +294,7 @@ ReqHandlerAdd(GUID switchTypeGuid,
>>       rc = UISMALLOC(sizeof(*rc), GFP_ATOMIC);
>>       if (!rc)
>>               return NULL;
>> -     memset(rc, 0, sizeof(*rc));
>> +
>>       rc->switchTypeGuid = switchTypeGuid;
>>       rc->controlfunc = controlfunc;
>>       rc->min_channel_bytes = min_channel_bytes;
>
> Can you just remove the UISMALLOC() macro completly, so that it's easier
> to verify that changes like this are actually correct?
>
> thanks,
>
> greg k-h
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