linux-kernel - Re: [PATCH v5 RESEND 03/17] openrisc: mm: remove unneeded early ioremap code

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Message-ID: <ZGMf+P6yccCYYI07@kernel.org>
Date:   Tue, 16 May 2023 09:17:28 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, arnd@...db.de, christophe.leroy@...roup.eu,
        hch@...radead.org, agordeev@...ux.ibm.com,
        wangkefeng.wang@...wei.com, schnelle@...ux.ibm.com,
        David.Laight@...lab.com, shorne@...il.com, willy@...radead.org,
        deller@....de, Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        openrisc@...ts.librecores.org
Subject: Re: [PATCH v5 RESEND 03/17] openrisc: mm: remove unneeded early
 ioremap code

On Mon, May 15, 2023 at 05:08:34PM +0800, Baoquan He wrote:
> Under arch/openrisc, there isn't any place where ioremap() is called.
> It means that there isn't early ioremap handling needed in openrisc,
> So the early ioremap handling code in ioremap() of
> arch/openrisc/mm/ioremap.c is unnecessary and can be removed.

It looks like early ioremap was the only user of fixmap on openrisc, so it
can be removed as well.
 
> Link: https://lore.kernel.org/linux-mm/YwxfxKrTUtAuejKQ@oscomms1/
> Signed-off-by: Baoquan He <bhe@...hat.com>
> Acked-by: Stafford Horne <shorne@...il.com>
> Cc: Jonas Bonn <jonas@...thpole.se>
> Cc: Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
> Cc: Stafford Horne <shorne@...il.com>
> Cc: openrisc@...ts.librecores.org
> ---
>  arch/openrisc/mm/ioremap.c | 22 +++++-----------------
>  1 file changed, 5 insertions(+), 17 deletions(-)
> 
> diff --git a/arch/openrisc/mm/ioremap.c b/arch/openrisc/mm/ioremap.c
> index 8ec0dafecf25..90b59bc53c8c 100644
> --- a/arch/openrisc/mm/ioremap.c
> +++ b/arch/openrisc/mm/ioremap.c
> @@ -22,8 +22,6 @@
>  
>  extern int mem_init_done;
>  
> -static unsigned int fixmaps_used __initdata;
> -
>  /*
>   * Remap an arbitrary physical address space into the kernel virtual
>   * address space. Needed when the kernel wants to access high addresses
> @@ -52,24 +50,14 @@ void __iomem *__ref ioremap(phys_addr_t addr, unsigned long size)
>  	p = addr & PAGE_MASK;
>  	size = PAGE_ALIGN(last_addr + 1) - p;
>  
> -	if (likely(mem_init_done)) {
> -		area = get_vm_area(size, VM_IOREMAP);
> -		if (!area)
> -			return NULL;
> -		v = (unsigned long)area->addr;
> -	} else {
> -		if ((fixmaps_used + (size >> PAGE_SHIFT)) > FIX_N_IOREMAPS)
> -			return NULL;
> -		v = fix_to_virt(FIX_IOREMAP_BEGIN + fixmaps_used);
> -		fixmaps_used += (size >> PAGE_SHIFT);
> -	}
> +	area = get_vm_area(size, VM_IOREMAP);
> +	if (!area)
> +		return NULL;
> +	v = (unsigned long)area->addr;
>  
>  	if (ioremap_page_range(v, v + size, p,
>  			__pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_CI))) {
> -		if (likely(mem_init_done))
> -			vfree(area->addr);
> -		else
> -			fixmaps_used -= (size >> PAGE_SHIFT);
> +		vfree(area->addr);
>  		return NULL;
>  	}
>  
> -- 
> 2.34.1
> 
> 

-- 
Sincerely yours,
Mike.