linux-kernel - Re: [PATCH v5 RESEND 17/17] mm: ioremap: remove unneeded ioremap_allowed and iounmap

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Message-ID: <ZGMqg8D0LOSH6SpX@kernel.org>
Date:   Tue, 16 May 2023 10:02:27 +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
Subject: Re: [PATCH v5 RESEND 17/17] mm: ioremap: remove unneeded
 ioremap_allowed and iounmap_allowed

On Mon, May 15, 2023 at 05:08:48PM +0800, Baoquan He wrote:
> Now there are no users of ioremap_allowed and iounmap_allowed, clean
> them up.
> 
> Signed-off-by: Baoquan He <bhe@...hat.com>

Reviewed-by: Mike Rapoport (IBM) <rppt@...nel.org>

> ---
>  include/asm-generic/io.h | 26 --------------------------
>  mm/ioremap.c             |  6 ------
>  2 files changed, 32 deletions(-)
> 
> diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> index 39244c3ee797..bac63e874c7b 100644
> --- a/include/asm-generic/io.h
> +++ b/include/asm-generic/io.h
> @@ -1047,32 +1047,6 @@ static inline void iounmap(volatile void __iomem *addr)
>  #elif defined(CONFIG_GENERIC_IOREMAP)
>  #include <linux/pgtable.h>
>  
> -/*
> - * Arch code can implement the following two hooks when using GENERIC_IOREMAP
> - * ioremap_allowed() return a bool,
> - *   - true means continue to remap
> - *   - false means skip remap and return directly
> - * iounmap_allowed() return a bool,
> - *   - true means continue to vunmap
> - *   - false means skip vunmap and return directly
> - */
> -#ifndef ioremap_allowed
> -#define ioremap_allowed ioremap_allowed
> -static inline bool ioremap_allowed(phys_addr_t phys_addr, size_t size,
> -				   unsigned long prot)
> -{
> -	return true;
> -}
> -#endif
> -
> -#ifndef iounmap_allowed
> -#define iounmap_allowed iounmap_allowed
> -static inline bool iounmap_allowed(void *addr)
> -{
> -	return true;
> -}
> -#endif
> -
>  void __iomem *generic_ioremap_prot(phys_addr_t phys_addr, size_t size,
>  				   pgprot_t prot);
>  
> diff --git a/mm/ioremap.c b/mm/ioremap.c
> index 4a7749d85044..8cb337446bba 100644
> --- a/mm/ioremap.c
> +++ b/mm/ioremap.c
> @@ -32,9 +32,6 @@ void __iomem *generic_ioremap_prot(phys_addr_t phys_addr, size_t size,
>  	phys_addr -= offset;
>  	size = PAGE_ALIGN(size + offset);
>  
> -	if (!ioremap_allowed(phys_addr, size, pgprot_val(prot)))
> -		return NULL;
> -
>  #ifdef IOREMAP_START
>  	area = __get_vm_area_caller(size, VM_IOREMAP, IOREMAP_START,
>  				    IOREMAP_END, __builtin_return_address(0));
> @@ -68,9 +65,6 @@ void generic_iounmap(volatile void __iomem *addr)
>  {
>  	void *vaddr = (void *)((unsigned long)addr & PAGE_MASK);
>  
> -	if (!iounmap_allowed(vaddr))
> -		return;
> -
>  	if (is_ioremap_addr(vaddr))
>  		vunmap(vaddr);
>  }
> -- 
> 2.34.1
> 
> 

-- 
Sincerely yours,
Mike.