linux-kernel - Re: [PATCH v5 6/8] mm: Move vmap_range from lib/ioremap.c to mm/vmalloc.c

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Message-ID: <20200821054653.GD28291@infradead.org>
Date:   Fri, 21 Aug 2020 06:46:53 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, Zefan Li <lizefan@...wei.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH v5 6/8] mm: Move vmap_range from lib/ioremap.c to
 mm/vmalloc.c

On Fri, Aug 21, 2020 at 02:44:25PM +1000, Nicholas Piggin wrote:
> This is a generic kernel virtual memory mapper, not specific to ioremap.

lib/ioremap doesn't exist any more.

> 
> Signed-off-by: Nicholas Piggin <npiggin@...il.com>
> ---
>  include/linux/vmalloc.h |   2 +
>  mm/ioremap.c            | 192 ----------------------------------------
>  mm/vmalloc.c            | 191 +++++++++++++++++++++++++++++++++++++++
>  3 files changed, 193 insertions(+), 192 deletions(-)
> 
> diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
> index 787d77ad7536..e3590e93bfff 100644
> --- a/include/linux/vmalloc.h
> +++ b/include/linux/vmalloc.h
> @@ -181,6 +181,8 @@ extern struct vm_struct *remove_vm_area(const void *addr);
>  extern struct vm_struct *find_vm_area(const void *addr);
>  
>  #ifdef CONFIG_MMU
> +extern int vmap_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot,
> +			unsigned int max_page_shift);

Please avoid the pointlessly long line.  And don't add the pointless
extern.