linux-kernel - Re: [PATCH] x86: clean up pgd

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Date:	Fri, 18 Jul 2008 07:52:05 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jan Beulich <jbeulich@...ell.com>
CC:	mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: clean up pgd_{c,d}tor

Jan Beulich wrote:
> Giving pgd_ctor() a properly typed parameter allows eliminating a local
> variable. Adjust pgd_dtor() to match.
>
> Also, pgd_ctor()'s clearing of the memory is redundant with the
> GFP_ZERO used for allocating it.
>   

Ack to the parameter type change.  But there's already a patch in git to 
remove the redundant clear.

    J

> Signed-off-by: Jan Beulich <jbeulich@...ell.com>
>
> ---
>  arch/x86/mm/pgtable.c |    8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
>
> --- linux-2.6.26/arch/x86/mm/pgtable.c	2008-07-13 23:51:29.000000000 +0200
> +++ 2.6.26-x86-pgd-alloc-cleanup/arch/x86/mm/pgtable.c	2008-06-25 14:35:40.000000000 +0200
> @@ -62,14 +62,10 @@ static inline void pgd_list_del(pgd_t *p
>  #define UNSHARED_PTRS_PER_PGD				\
>  	(SHARED_KERNEL_PMD ? KERNEL_PGD_BOUNDARY : PTRS_PER_PGD)
>  
> -static void pgd_ctor(void *p)
> +static void pgd_ctor(pgd_t *pgd)
>  {
> -	pgd_t *pgd = p;
>  	unsigned long flags;
>  
> -	/* Clear usermode parts of PGD */
> -	memset(pgd, 0, KERNEL_PGD_BOUNDARY*sizeof(pgd_t));
> -
>  	spin_lock_irqsave(&pgd_lock, flags);
>  
>  	/* If the pgd points to a shared pagetable level (either the
> @@ -94,7 +90,7 @@ static void pgd_ctor(void *p)
>  	spin_unlock_irqrestore(&pgd_lock, flags);
>  }
>  
> -static void pgd_dtor(void *pgd)
> +static void pgd_dtor(pgd_t *pgd)
>  {
>  	unsigned long flags; /* can be called from interrupt context */
>  
>
>
>
> --
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