linux-kernel - Re: [PATCH 1/3] staging/rdma/hfi1: consolidate kmalloc

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Date:	Mon, 14 Dec 2015 17:41:23 +0000
From:	Nicholas Mc Guire <der.herr@...r.at>
To:	"Marciniszyn, Mike" <mike.marciniszyn@...el.com>
Cc:	Nicholas Mc Guire <hofrat@...dl.org>,
	Doug Ledford <dledford@...hat.com>,
	"Hefty, Sean" <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] staging/rdma/hfi1: consolidate kmalloc_array+memset
 into kcalloc

On Mon, Dec 14, 2015 at 03:28:46PM +0000, Marciniszyn, Mike wrote:
> > --- a/drivers/staging/rdma/hfi1/chip.c
> > +++ b/drivers/staging/rdma/hfi1/chip.c
> > @@ -10128,8 +10128,7 @@ static void init_qos(struct hfi1_devdata *dd,
> > u32 first_ctxt)
> >  		goto bail;
> >  	if (num_vls * qpns_per_vl > dd->chip_rcv_contexts)
> >  		goto bail;
> > -	rsmmap = kmalloc_array(NUM_MAP_REGS, sizeof(u64),
> > GFP_KERNEL);
> > -	memset(rsmmap, rxcontext, NUM_MAP_REGS * sizeof(u64));
> > +	rsmmap = kcalloc(NUM_MAP_REGS, sizeof(u64), GFP_KERNEL);
> >  	/* init the local copy of the table */
> >  	for (i = 0, ctxt = first_ctxt; i < num_vls; i++) {
> >  		unsigned tctxt;
> > --
> 
> I'm NAKing this.
> 
> There is a chip specific difference that accounts for the current code.
>
I obviously made a real mess here.
I incorrectly concluded that rxcontext is 0 which it is not in some cases

sorry for the noise.

thx!
hofrat



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