linux-kernel - Re: [PATCH v2 1/2] powerpc: pci-ioda: use bitmap_alloc() in pnv_ioda_pick_m64

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Message-ID: <b1fe7008d2f230dd89be6d2541b7cf07ed2514e3.camel@linux.ibm.com>
Date: Tue, 12 Aug 2025 11:07:08 +1000
From: Andrew Donnellan <ajd@...ux.ibm.com>
To: Yury Norov <yury.norov@...il.com>,
        "Jiri Slaby (SUSE)"	
 <jirislaby@...nel.org>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Michael
 Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy	 <christophe.leroy@...roup.eu>,
        Thomas Gleixner
 <tglx@...utronix.de>,
        Frederic Barrat <fbarrat@...ux.ibm.com>, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] powerpc: pci-ioda: use bitmap_alloc() in
 pnv_ioda_pick_m64_pe()

On Mon, 2025-08-11 at 12:51 -0400, Yury Norov wrote:

> -	/* Allocate bitmap */
> -	size = ALIGN(phb->ioda.total_pe_num / 8, sizeof(unsigned long));
> -	pe_alloc = kzalloc(size, GFP_KERNEL);
> +	pe_alloc = bitmap_alloc(phb->ioda.total_pe_num, GFP_KERNEL);

I haven't checked whether or not this has practical impact given what we later
do with the bitmap - does this need to be bitmap_zalloc() to match the existing
use of kzalloc()?

-- 
Andrew Donnellan    OzLabs, ADL Canberra
ajd@...ux.ibm.com   IBM Australia Limited