linux-kernel - Re: [PATCH v3 7/7] sh: mm: set VM_IOREMAP flag to the vmalloc area

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Message-ID: <Y8VCPwoNENBUyWEd@lucifer>
Date:   Mon, 16 Jan 2023 12:25:35 +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 7/7] sh: mm: set VM_IOREMAP flag to the vmalloc area

On Fri, Jan 13, 2023 at 11:19:21AM +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 ioremap in __sq_remap() of sh, we should set VM_IOREMAP
> in flag to make it handled correctly as above.
>
> Signed-off-by: Baoquan He <bhe@...hat.com>
> ---
>  arch/sh/kernel/cpu/sh4/sq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/sh/kernel/cpu/sh4/sq.c b/arch/sh/kernel/cpu/sh4/sq.c
> index a76b94e41e91..27f2e3da5aa2 100644
> --- a/arch/sh/kernel/cpu/sh4/sq.c
> +++ b/arch/sh/kernel/cpu/sh4/sq.c
> @@ -103,7 +103,7 @@ static int __sq_remap(struct sq_mapping *map, pgprot_t prot)
>  #if defined(CONFIG_MMU)
>  	struct vm_struct *vma;
>
> -	vma = __get_vm_area_caller(map->size, VM_ALLOC, map->sq_addr,
> +	vma = __get_vm_area_caller(map->size, VM_IOREMAP, map->sq_addr,
>  			SQ_ADDRMAX, __builtin_return_address(0));
>  	if (!vma)
>  		return -ENOMEM;
> --
> 2.34.1
>

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