linux-kernel - Re: [PATCH v5 2/6] mm: ioremap: Use more sensibly name in ioremap

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Message-ID: <YqAir8uTUziObhHn@MiWiFi-R3L-srv>
Date:   Wed, 8 Jun 2022 12:16:47 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     catalin.marinas@....com, will@...nel.org,
        akpm@...ux-foundation.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        hch@...radead.org, arnd@...db.de, anshuman.khandual@....com
Subject: Re: [PATCH v5 2/6] mm: ioremap: Use more sensibly name in
 ioremap_prot()

On 06/07/22 at 08:50pm, Kefeng Wang wrote:
> Use more meaningful and sensibly naming phys_addr
> instead addr in ioremap_prot().
> 
> Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
> Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
>  include/asm-generic/io.h |  3 ++-
>  mm/ioremap.c             | 14 ++++++++------
>  2 files changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> index 7ce93aaf69f8..b76379628a02 100644
> --- a/include/asm-generic/io.h
> +++ b/include/asm-generic/io.h
> @@ -964,7 +964,8 @@ static inline void iounmap(volatile void __iomem *addr)
>  #elif defined(CONFIG_GENERIC_IOREMAP)
>  #include <linux/pgtable.h>
>  
> -void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot);
> +void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
> +			   unsigned long prot);
>  void iounmap(volatile void __iomem *addr);
>  
>  static inline void __iomem *ioremap(phys_addr_t addr, size_t size)
> diff --git a/mm/ioremap.c b/mm/ioremap.c
> index 5fe598ecd9b7..2d754b48d230 100644
> --- a/mm/ioremap.c
> +++ b/mm/ioremap.c
> @@ -11,20 +11,21 @@
>  #include <linux/io.h>
>  #include <linux/export.h>
>  
> -void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
> +void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
> +			   unsigned long prot)
>  {
>  	unsigned long offset, vaddr;
>  	phys_addr_t last_addr;
>  	struct vm_struct *area;
>  
>  	/* Disallow wrap-around or zero size */
> -	last_addr = addr + size - 1;
> -	if (!size || last_addr < addr)
> +	last_addr = phys_addr + size - 1;
> +	if (!size || last_addr < phys_addr)
>  		return NULL;
>  
>  	/* Page-align mappings */
> -	offset = addr & (~PAGE_MASK);
> -	addr -= offset;
> +	offset = phys_addr & (~PAGE_MASK);
                 ~~~ use offset_in_page() instead?

Other than this nitpick, this looks good to me.

Reviewed-by: Baoquan He <bhe@...hat.com>

> +	phys_addr -= offset;
>  	size = PAGE_ALIGN(size + offset);
>  
>  	area = get_vm_area_caller(size, VM_IOREMAP,
> @@ -33,7 +34,8 @@ void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
>  		return NULL;
>  	vaddr = (unsigned long)area->addr;
>  
> -	if (ioremap_page_range(vaddr, vaddr + size, addr, __pgprot(prot))) {
> +	if (ioremap_page_range(vaddr, vaddr + size, phys_addr,
> +			       __pgprot(prot))) {
>  		free_vm_area(area);
>  		return NULL;
>  	}
> -- 
> 2.35.3
> 
>