linux-kernel - Re: [BUGFIX][PATCH] x86: fix set_fixmap to use phys_addr

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Date:	Thu, 9 Apr 2009 14:46:05 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	systemtap-ml <systemtap@...rces.redhat.com>,
	Gary Hade <garyhade@...ibm.com>
Subject: Re: [BUGFIX][PATCH] x86: fix set_fixmap to use phys_addr_t

* Masami Hiramatsu (mhiramat@...hat.com) wrote:
> Use phys_addr_t for receiving a physical address argument
> instead of unsigned long. This allows fixmap to handle
> pages higher than 4GB on x86-32.
> 

You might also want to update arch/x86/mm/ioremap.c:early_set_fixmap()
and __early_set_fixmap().

Otherwise it looks good.

Thanks,

Mathieu

> Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> ---
> 
>  arch/x86/include/asm/fixmap.h   |    4 ++--
>  arch/x86/include/asm/paravirt.h |    4 ++--
>  arch/x86/mm/pgtable.c           |    3 ++-
>  arch/x86/xen/mmu.c              |    2 +-
>  4 files changed, 7 insertions(+), 6 deletions(-)
> 
> 
> diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
> index 81937a5..2d81af3 100644
> --- a/arch/x86/include/asm/fixmap.h
> +++ b/arch/x86/include/asm/fixmap.h
> @@ -151,11 +151,11 @@ extern pte_t *pkmap_page_table;
> 
>  void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
>  void native_set_fixmap(enum fixed_addresses idx,
> -		       unsigned long phys, pgprot_t flags);
> +		       phys_addr_t phys, pgprot_t flags);
> 
>  #ifndef CONFIG_PARAVIRT
>  static inline void __set_fixmap(enum fixed_addresses idx,
> -				unsigned long phys, pgprot_t flags)
> +				phys_addr_t phys, pgprot_t flags)
>  {
>  	native_set_fixmap(idx, phys, flags);
>  }
> diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
> index 7727aa8..378e369 100644
> --- a/arch/x86/include/asm/paravirt.h
> +++ b/arch/x86/include/asm/paravirt.h
> @@ -347,7 +347,7 @@ struct pv_mmu_ops {
>  	/* Sometimes the physical address is a pfn, and sometimes its
>  	   an mfn.  We can tell which is which from the index. */
>  	void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
> -			   unsigned long phys, pgprot_t flags);
> +			   phys_addr_t phys, pgprot_t flags);
>  };
> 
>  struct raw_spinlock;
> @@ -1432,7 +1432,7 @@ static inline void arch_leave_lazy_mmu_mode(void)
>  void arch_flush_lazy_mmu_mode(void);
> 
>  static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
> -				unsigned long phys, pgprot_t flags)
> +				phys_addr_t phys, pgprot_t flags)
>  {
>  	pv_mmu_ops.set_fixmap(idx, phys, flags);
>  }
> diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
> index 7a4d6ee..8e43bdd 100644
> --- a/arch/x86/mm/pgtable.c
> +++ b/arch/x86/mm/pgtable.c
> @@ -347,7 +347,8 @@ void __native_set_fixmap(enum fixed_addresses idx, pte_t pte)
>  	fixmaps_set++;
>  }
> 
> -void native_set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t flags)
> +void native_set_fixmap(enum fixed_addresses idx, phys_addr_t phys,
> +		       pgprot_t flags)
>  {
>  	__native_set_fixmap(idx, pfn_pte(phys >> PAGE_SHIFT, flags));
>  }
> diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
> index db3802f..2a81838 100644
> --- a/arch/x86/xen/mmu.c
> +++ b/arch/x86/xen/mmu.c
> @@ -1750,7 +1750,7 @@ __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
>  }
>  #endif	/* CONFIG_X86_64 */
> 
> -static void xen_set_fixmap(unsigned idx, unsigned long phys, pgprot_t prot)
> +static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
>  {
>  	pte_t pte;
> 

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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