Re: [mdadm PATCH 1/3] fix gcc warnings about strict-aliasing rules

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On Tue, Mar 02, 2010 at 10:40:21AM +0300, Michael Tokarev wrote:
Luca Berra wrong:
Signed-off-by: Luca Berra <bluca@xxxxxxxxxx>
---
  util.c |    4 ++--
  1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/util.c b/util.c
index 68f048d..1def2a0 100644
--- a/util.c
+++ b/util.c
@@ -1160,7 +1160,7 @@ static int get_gpt_last_partition_end(int fd,
unsigned long long *endofpart)
      entry_size = __le32_to_cpu(buf[GPT_ENTRY_SIZE_OFFSET]);
        /* Check GPT signature*/
-    if (*((__u64*)buf) != GPT_SIGNATURE_MAGIC)
+    if ((__u64)buf[0] != GPT_SIGNATURE_MAGIC)

This looks wrong.

buf is an array of unsigned char.  Before, we converted the
whole thing to a pointer to u64 and took the first element
at that address, u64 size.  Now after the change, we take
first _byte_ of the array, convert it to u64 (adding leading
zeros) and compare with a large number.

you are correct, this is obviously wrong, i wonder what i was thinking.

any idea on how to get this right?
sscanf? union?

Regards,
L.

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Luca Berra -- bluca@xxxxxxxxxx
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