linux-kernel - Re: [PATCH v3 6/7] powerpc: mm: add VM

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Message-ID: <Y8VCIRDcAh33OIvM@lucifer>
Date:   Mon, 16 Jan 2023 12:25:05 +0000
From:   Lorenzo Stoakes <lstoakes@...il.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, urezki@...il.com,
        stephen.s.brennan@...cle.com, willy@...radead.org,
        akpm@...ux-foundation.org, hch@...radead.org
Subject: Re: [PATCH v3 6/7] powerpc: mm: add VM_IOREMAP flag to the vmalloc
 area

On Fri, Jan 13, 2023 at 11:19:20AM +0800, Baoquan He wrote:
> Currently, for vmalloc areas with flag VM_IOREMAP set, except of the
> specific alignment clamping in __get_vm_area_node(), they will be
>  1) Shown as ioremap in /proc/vmallocinfo;
>  2) Ignored by /proc/kcore reading via vread()
>
> So for the io mapping in ioremap_phb() of ppc, we should set VM_IOREMAP
> in flag to make it handled correctly as above.
>
> Signed-off-by: Baoquan He <bhe@...hat.com>
> ---
>  arch/powerpc/kernel/pci_64.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
> index 0c7cfb9fab04..fd42059ae2a5 100644
> --- a/arch/powerpc/kernel/pci_64.c
> +++ b/arch/powerpc/kernel/pci_64.c
> @@ -132,7 +132,7 @@ void __iomem *ioremap_phb(phys_addr_t paddr, unsigned long size)
>  	 * address decoding but I'd rather not deal with those outside of the
>  	 * reserved 64K legacy region.
>  	 */
> -	area = __get_vm_area_caller(size, 0, PHB_IO_BASE, PHB_IO_END,
> +	area = __get_vm_area_caller(size, VM_IOREMAP, PHB_IO_BASE, PHB_IO_END,
>  				    __builtin_return_address(0));
>  	if (!area)
>  		return NULL;
> --
> 2.34.1
>

Reviewed-by: Lorenzo Stoakes <lstoakes@...il.com>