[PATCH v2 3/3] arm64: drop sleep_idmap_phys

[lorenzo.pieralisi@arm.com (Lorenzo Pieralisi)]

On Mon, Mar 23, 2015 at 09:07:26AM +0000, Ard Biesheuvel wrote:
> The global variable sleep_idmap_phys always points to idmap_pg_dir,
> so we can just use that value directly in the CPU resume path.
> 
> Also unclutters the load of sleep_save_sp::save_ptr_stash_phys.
> 

Nit: I understand why you want to do more than one change at once,
I think you should reword the subject though for completeness.

> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>  arch/arm64/kernel/sleep.S   | 7 ++-----
>  arch/arm64/kernel/suspend.c | 3 ---
>  2 files changed, 2 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arm64/kernel/sleep.S b/arch/arm64/kernel/sleep.S
> index 04dc9aa2831e..3c98fe1c1c2f 100644
> --- a/arch/arm64/kernel/sleep.S
> +++ b/arch/arm64/kernel/sleep.S
> @@ -164,15 +164,12 @@ ENTRY(cpu_resume)
>  #else
>  	mov	x7, xzr
>  #endif
> -	adrp	x0, sleep_save_sp
> -	add	x0, x0, #:lo12:sleep_save_sp
> -	ldr	x0, [x0, #SLEEP_SAVE_SP_PHYS]
> +	ldr_l	x0, sleep_save_sp + SLEEP_SAVE_SP_PHYS
>  	ldr	x0, [x0, x7, lsl #3]
>  	/* load sp from context */
>  	ldr	x2, [x0, #CPU_CTX_SP]
> -	adrp	x1, sleep_idmap_phys
>  	/* load physical address of identity map page table in x1 */
> -	ldr	x1, [x1, #:lo12:sleep_idmap_phys]
> +	adrp	x1, idmap_pg_dir
>  	mov	sp, x2
>  	/*
>  	 * cpu_do_resume expects x0 to contain context physical address
> diff --git a/arch/arm64/kernel/suspend.c b/arch/arm64/kernel/suspend.c
> index d7daf45ae7a2..f6073c27d65f 100644
> --- a/arch/arm64/kernel/suspend.c
> +++ b/arch/arm64/kernel/suspend.c
> @@ -118,7 +118,6 @@ int __cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
>  }
>  
>  struct sleep_save_sp sleep_save_sp;
> -phys_addr_t sleep_idmap_phys;
>  
>  static int __init cpu_suspend_init(void)
>  {
> @@ -132,9 +131,7 @@ static int __init cpu_suspend_init(void)
>  
>  	sleep_save_sp.save_ptr_stash = ctx_ptr;
>  	sleep_save_sp.save_ptr_stash_phys = virt_to_phys(ctx_ptr);
> -	sleep_idmap_phys = virt_to_phys(idmap_pg_dir);
>  	__flush_dcache_area(&sleep_save_sp, sizeof(struct sleep_save_sp));
> -	__flush_dcache_area(&sleep_idmap_phys, sizeof(sleep_idmap_phys));
>  
>  	return 0;
>  }

Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>