linux-kernel - Re: [PATCH 01/12] Btrfs: Remove superfluous casts from u64 to unsigned long long

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Date:	Tue, 20 Aug 2013 09:16:58 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Chris Mason <chris.mason@...ionio.com>,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/12] Btrfs: Remove superfluous casts from u64 to unsigned
 long long

On 8/20/13 6:20 AM, Geert Uytterhoeven wrote:
> u64 is "unsigned long long" on all architectures now, so there's no need to
> cast it when formatting it using the "ll" length modifier.
> 
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
>  fs/btrfs/backref.c          |   24 ++--
>  fs/btrfs/check-integrity.c  |  294 ++++++++++++++-----------------------------
>  fs/btrfs/compression.c      |    5 +-
>  fs/btrfs/ctree.c            |    6 +-
>  fs/btrfs/delayed-inode.c    |   10 +-
>  fs/btrfs/dev-replace.c      |    2 +-
>  fs/btrfs/disk-io.c          |   25 ++--
>  fs/btrfs/extent-tree.c      |   47 +++----
>  fs/btrfs/extent_io.c        |   30 ++---
>  fs/btrfs/file-item.c        |    4 +-
>  fs/btrfs/free-space-cache.c |    6 +-
>  fs/btrfs/inode.c            |   24 ++--
>  fs/btrfs/ioctl.c            |   10 +-
>  fs/btrfs/ordered-data.c     |   11 +-
>  fs/btrfs/print-tree.c       |   80 +++++-------
>  fs/btrfs/qgroup.c           |   10 +-
>  fs/btrfs/relocation.c       |    7 +-
>  fs/btrfs/root-tree.c        |    3 +-
>  fs/btrfs/scrub.c            |   16 +--
>  fs/btrfs/super.c            |   10 +-
>  fs/btrfs/transaction.c      |    3 +-
>  fs/btrfs/volumes.c          |   19 ++-
>  22 files changed, 222 insertions(+), 424 deletions(-)
> 
> diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
> index 8bc5e8c..c1a518e 100644
> --- a/fs/btrfs/backref.c
> +++ b/fs/btrfs/backref.c
> @@ -295,10 +295,9 @@ static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info,
>  	ret = btrfs_search_old_slot(root, &ref->key_for_search, path, time_seq);
>  	pr_debug("search slot in root %llu (level %d, ref count %d) returned "
>  		 "%d for key (%llu %u %llu)\n",
> -		 (unsigned long long)ref->root_id, level, ref->count, ret,
> -		 (unsigned long long)ref->key_for_search.objectid,
> -		 ref->key_for_search.type,
> -		 (unsigned long long)ref->key_for_search.offset);
> +		 ref->root_id, level, ref->count, ret,
> +		 ref->key_for_search.objectid, ref->key_for_search.type,
> +		 ref->key_for_search.offset);
>  	if (ret < 0)
>  		goto out;
>  
> @@ -1326,8 +1325,7 @@ int extent_from_logical(struct btrfs_fs_info *fs_info, u64 logical,
>  	     found_key->type != BTRFS_METADATA_ITEM_KEY) ||
>  	    found_key->objectid > logical ||
>  	    found_key->objectid + size <= logical) {
> -		pr_debug("logical %llu is not within any extent\n",
> -			 (unsigned long long)logical);
> +		pr_debug("logical %llu is not within any extent\n", logical);

...

Many platforms use "long" for u64, so without these casts, they'll generate
compile-time printf-format warnings.  See int-l64.h, and the various
arch/*/include/uapi/asm/types.h files that include it - ia64, ppc, etc.

-Eric

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