linux-kernel - Re: [PATCH 2/3] powernv/pci: Use common code in pnv_ioda_pick_m64

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Date:   Wed, 18 Oct 2017 16:24:51 +1100
From:   Alexey Kardashevskiy <aik@...abs.ru>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        linuxppc-dev@...ts.ozlabs.org,
        Alistair Popple <alistair@...ple.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        David Gibson <david@...son.dropbear.id.au>,
        Gavin Shan <gwshan@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Rob Herring <robh@...nel.org>,
        Russell Currey <ruscur@...sell.cc>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 2/3] powernv/pci: Use common code in
 pnv_ioda_pick_m64_pe()

On 18/10/17 02:39, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Tue, 17 Oct 2017 17:07:54 +0200
> 
> Add a jump target so that a bit of code can be better reused
> at the end of this function.


Rather than moving bits around, I'd rather allocate pe_alloc on stack and
ditch kfree() at all. I'll make a patch for this.

> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  arch/powerpc/platforms/powernv/pci-ioda.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
> index 17c0330bb059..98d9435240f4 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -364,21 +364,20 @@ static struct pnv_ioda_pe *pnv_ioda_pick_m64_pe(struct pci_bus *bus, bool all)
>  	/* Figure out reserved PE numbers by the PE */
>  	pnv_ioda_reserve_m64_pe(bus, pe_alloc, all);
>  
> +	master_pe = NULL;
> +
>  	/*
>  	 * the current bus might not own M64 window and that's all
>  	 * contributed by its child buses. For the case, we needn't
>  	 * pick M64 dependent PE#.
>  	 */
> -	if (bitmap_empty(pe_alloc, phb->ioda.total_pe_num)) {
> -		kfree(pe_alloc);
> -		return NULL;
> -	}
> +	if (bitmap_empty(pe_alloc, phb->ioda.total_pe_num))
> +		goto free_pe;
>  
>  	/*
>  	 * Figure out the master PE and put all slave PEs to master
>  	 * PE's list to form compound PE.
>  	 */
> -	master_pe = NULL;
>  	i = -1;
>  	while ((i = find_next_bit(pe_alloc, phb->ioda.total_pe_num, i + 1)) <
>  		phb->ioda.total_pe_num) {
> @@ -416,6 +415,7 @@ static struct pnv_ioda_pe *pnv_ioda_pick_m64_pe(struct pci_bus *bus, bool all)
>  		}
>  	}
>  
> +free_pe:
>  	kfree(pe_alloc);
>  	return master_pe;
>  }
> 



-- 
Alexey