linux-kernel - Re: [PATCH] mm/memblock: replace u64 with phys_addr

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Message-ID: <20180704140419.GU22503@dhcp22.suse.cz>
Date:   Wed, 4 Jul 2018 16:04:19 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Mike Rapoport <rppt@...ux.vnet.ibm.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH] mm/memblock: replace u64 with phys_addr_t where
 appropriate

On Tue 03-07-18 20:05:06, Mike Rapoport wrote:
> Most functions in memblock already use phys_addr_t to represent a physical
> address with __memblock_free_late() being an exception.
> 
> This patch replaces u64 with phys_addr_t in __memblock_free_late() and
> switches several format strings from %llx to %pa to avoid casting from
> phys_addr_t to u64.
> 
> CC: Michal Hocko <mhocko@...nel.org>
> CC: Matthew Wilcox <willy@...radead.org>
> Signed-off-by: Mike Rapoport <rppt@...ux.vnet.ibm.com>

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  mm/memblock.c | 46 +++++++++++++++++++++++-----------------------
>  1 file changed, 23 insertions(+), 23 deletions(-)
> 
> diff --git a/mm/memblock.c b/mm/memblock.c
> index 03d48d8..20ad8e9 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -330,7 +330,7 @@ static int __init_memblock memblock_double_array(struct memblock_type *type,
>  {
>  	struct memblock_region *new_array, *old_array;
>  	phys_addr_t old_alloc_size, new_alloc_size;
> -	phys_addr_t old_size, new_size, addr;
> +	phys_addr_t old_size, new_size, addr, new_end;
>  	int use_slab = slab_is_available();
>  	int *in_slab;
>  
> @@ -391,9 +391,9 @@ static int __init_memblock memblock_double_array(struct memblock_type *type,
>  		return -1;
>  	}
>  
> -	memblock_dbg("memblock: %s is doubled to %ld at [%#010llx-%#010llx]",
> -			type->name, type->max * 2, (u64)addr,
> -			(u64)addr + new_size - 1);
> +	new_end = addr + new_size - 1;
> +	memblock_dbg("memblock: %s is doubled to %ld at [%pa-%pa]",
> +			type->name, type->max * 2, &addr, &new_end);
>  
>  	/*
>  	 * Found space, we now need to move the array over before we add the
> @@ -1343,9 +1343,9 @@ void * __init memblock_virt_alloc_try_nid_raw(
>  {
>  	void *ptr;
>  
> -	memblock_dbg("%s: %llu bytes align=0x%llx nid=%d from=0x%llx max_addr=0x%llx %pF\n",
> -		     __func__, (u64)size, (u64)align, nid, (u64)min_addr,
> -		     (u64)max_addr, (void *)_RET_IP_);
> +	memblock_dbg("%s: %llu bytes align=0x%llx nid=%d from=%pa max_addr=%pa %pF\n",
> +		     __func__, (u64)size, (u64)align, nid, &min_addr,
> +		     &max_addr, (void *)_RET_IP_);
>  
>  	ptr = memblock_virt_alloc_internal(size, align,
>  					   min_addr, max_addr, nid);
> @@ -1380,9 +1380,9 @@ void * __init memblock_virt_alloc_try_nid_nopanic(
>  {
>  	void *ptr;
>  
> -	memblock_dbg("%s: %llu bytes align=0x%llx nid=%d from=0x%llx max_addr=0x%llx %pF\n",
> -		     __func__, (u64)size, (u64)align, nid, (u64)min_addr,
> -		     (u64)max_addr, (void *)_RET_IP_);
> +	memblock_dbg("%s: %llu bytes align=0x%llx nid=%d from=%pa max_addr=%pa %pF\n",
> +		     __func__, (u64)size, (u64)align, nid, &min_addr,
> +		     &max_addr, (void *)_RET_IP_);
>  
>  	ptr = memblock_virt_alloc_internal(size, align,
>  					   min_addr, max_addr, nid);
> @@ -1416,9 +1416,9 @@ void * __init memblock_virt_alloc_try_nid(
>  {
>  	void *ptr;
>  
> -	memblock_dbg("%s: %llu bytes align=0x%llx nid=%d from=0x%llx max_addr=0x%llx %pF\n",
> -		     __func__, (u64)size, (u64)align, nid, (u64)min_addr,
> -		     (u64)max_addr, (void *)_RET_IP_);
> +	memblock_dbg("%s: %llu bytes align=0x%llx nid=%d from=%pa max_addr=%pa %pF\n",
> +		     __func__, (u64)size, (u64)align, nid, &min_addr,
> +		     &max_addr, (void *)_RET_IP_);
>  	ptr = memblock_virt_alloc_internal(size, align,
>  					   min_addr, max_addr, nid);
>  	if (ptr) {
> @@ -1426,9 +1426,8 @@ void * __init memblock_virt_alloc_try_nid(
>  		return ptr;
>  	}
>  
> -	panic("%s: Failed to allocate %llu bytes align=0x%llx nid=%d from=0x%llx max_addr=0x%llx\n",
> -	      __func__, (u64)size, (u64)align, nid, (u64)min_addr,
> -	      (u64)max_addr);
> +	panic("%s: Failed to allocate %llu bytes align=0x%llx nid=%d from=%pa max_addr=%pa\n",
> +	      __func__, (u64)size, (u64)align, nid, &min_addr, &max_addr);
>  	return NULL;
>  }
>  
> @@ -1442,9 +1441,10 @@ void * __init memblock_virt_alloc_try_nid(
>   */
>  void __init __memblock_free_early(phys_addr_t base, phys_addr_t size)
>  {
> -	memblock_dbg("%s: [%#016llx-%#016llx] %pF\n",
> -		     __func__, (u64)base, (u64)base + size - 1,
> -		     (void *)_RET_IP_);
> +	phys_addr_t end = base + size - 1;
> +
> +	memblock_dbg("%s: [%pa-%pa] %pF\n",
> +		     __func__, &base, &end, (void *)_RET_IP_);
>  	kmemleak_free_part_phys(base, size);
>  	memblock_remove_range(&memblock.reserved, base, size);
>  }
> @@ -1460,11 +1460,11 @@ void __init __memblock_free_early(phys_addr_t base, phys_addr_t size)
>   */
>  void __init __memblock_free_late(phys_addr_t base, phys_addr_t size)
>  {
> -	u64 cursor, end;
> +	phys_addr_t cursor, end;
>  
> -	memblock_dbg("%s: [%#016llx-%#016llx] %pF\n",
> -		     __func__, (u64)base, (u64)base + size - 1,
> -		     (void *)_RET_IP_);
> +	end = base + size - 1;
> +	memblock_dbg("%s: [%pa-%pa] %pF\n",
> +		     __func__, &base, &end, (void *)_RET_IP_);
>  	kmemleak_free_part_phys(base, size);
>  	cursor = PFN_UP(base);
>  	end = PFN_DOWN(base + size);
> -- 
> 2.7.4

-- 
Michal Hocko
SUSE Labs