linux-kernel - Re: [PATCH] block: partitions: efi: Typecast sizeof(gpt

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Date:	Wed, 20 Feb 2013 12:59:43 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Peter Jones <pjones@...hat.com>
Cc:	Fabio Estevam <festevam@...il.com>, sfr@...b.auug.org.au,
	linux-kernel@...r.kernel.org,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Matt Fleming <matt.fleming@...el.com>,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH] block: partitions: efi: Typecast sizeof(gpt_header)

On Wed, 20 Feb 2013 11:27:48 -0500
Peter Jones <pjones@...hat.com> wrote:

> On Wed, Feb 20, 2013 at 11:52:10AM -0300, Fabio Estevam wrote:
> > From: Fabio Estevam <fabio.estevam@...escale.com>
> > 
> > Since commit ef25bb0fa6e2 (block/partitions/efi.c: ensure that the GPT header is
> > at least the size of the structure.) , when building for a 32-bit architecture, 
> > such as ARM, the following build warning is seen:
> > 
> > block/partitions/efi.c:324:3: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'unsigned int' [-Wformat]
> 
> Hi Fabio,
> 
> I sent and updated version of ef25bb0fa6e2 this morning to fix this
> issue.  Thanks for the patch, though.  Andrew, if you'd like you can
> just use this instead of replacing my patch with the new one.

You're both wrong ;)  Print a size_t with %z:

--- a/block/partitions/efi.c~ensure-that-the-gpt-header-is-at-least-the-size-of-the-structure-fix
+++ a/block/partitions/efi.c
@@ -321,7 +321,7 @@ static int is_gpt_valid(struct parsed_pa
 
 	/* Check the GUID Partition Table header size is too small */
 	if (le32_to_cpu((*gpt)->header_size) < sizeof(gpt_header)) {
-		pr_debug("GUID Partition Table Header size is too small: %u < %lu\n",
+		pr_debug("GUID Partition Table Header size is too small: %u < %zu\n",
 			le32_to_cpu((*gpt)->header_size),
 			sizeof(gpt_header));
 		goto fail;
_

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