On 12-10-14 10:13, Arend van Spriel wrote:
> On 11-10-14 22:17, Greg Kroah-Hartman wrote:
>> On Sat, Oct 11, 2014 at 06:01:55PM +0200, Arend van Spriel wrote:
>>> This patch adds a helper function that simplifies adding a
>>> sequence file for device drivers. The calling device driver
>>> needs to provide a read function and a device pointer. The
>>> field struct seq_file::private will reference the device
>>> pointer upon call to the read function so the driver can
>>> obtain his data from it and do its seq_printf() calls.
>>>
>>> Signed-off-by: Arend van Spriel <[email protected]>
>>> ---
>>> fs/debugfs/file.c | 54
>>> +++++++++++++++++++++++++++++++++++++++++++++++++
>>> include/linux/debugfs.h | 16 ++++++++++++++-
>>> 2 files changed, 69 insertions(+), 1 deletion(-)
>>
>> Do you have some kernel code pending that needs this change? Or can
>> existing users be moved to it, saving them code?
>
> Yes and maybe. I made a similar change in our brcm80211 drivers, but
> figured it may be useful for other device drivers. So when this gets in
> the kernel I want to align the brcm80211 drivers. I will also have a
> quick look at the wireless drivers and get some metrics about code savings.
Hi, Greg
Killed a bit of time between lpc sessions in dusseldorf. I picked the
ath9k wireless driver as a test case. I made the changes in two steps.
First step was changing to use seq_file api and second step made use of
the helper function:
original seq_file helper
logstat - 173+/255- 32+/96-
ath9k.o 115968 113224 111024 (.text size)
I am considering to make an attempt at capturing the transition in a
SmPL script so it can be applied to other drivers as well. Have to do a
bit of self-study for that ;-)
Regards,
Arend
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