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Date:   Sun, 24 May 2020 15:58:20 +0200
From:   Luc Van Oostenryck <>
Subject: Re: [PATCH] Removing ununsed variable int lo, hi, int data and int i
 from comedi/drivers/dt2814.c.

On Sun, May 24, 2020 at 06:19:22PM +0530, GAURAV PATHAK wrote:
> Thanks a lot for your reply.
> I am trying to run sparse on drivers/staging directory,
> but I am not getting any useful warnings.
> Steps that I did:
> - Referred to get
> linux-next latest tag next-20200522.
> - After that executed following commands:
> 	- make mrproper; make clean; make distclean
> 	- make defconfig
> 	- make menuconfig (Enabled all Staging Drivers with M)
> 	- make modules_prepare
> 	- make C=1 M=drivers/staging (Also tried individual directories
> 	  inside staging directory e.g. make C=1 M=drivers/staging/comedi/drivers)
> I am not getting any warning, I have attached the output in text format.
> Any pointers for finding warning using sparse in drivers/staging
> directory will be helpful. I really appretiate your guidance in this
> regard.

Well it seems that most staging drivers have no sparse warnings at all.
I only see somes in the following staging drivers:

Your commands seems to be good but I would advice you to use 'C=2'
instead of 'C=1' in order for sparse to effectively run on each
input file even when the corresponding .o file already exists.

The simplest to use is:
	- make allmodconfig
	- make -j8 drivers/staging/
This will just compile all the files without running sparse.
So all warnings will be from the compiler.
The you can run:
	- make C=2 drivers/staging/
which will only run sparse (and will thus be much faster).
Best regards,
-- Luc

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