From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46265) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VGPqK-0007XE-E4 for qemu-devel@nongnu.org; Mon, 02 Sep 2013 04:50:45 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VGPqF-0005Gc-Ly for qemu-devel@nongnu.org; Mon, 02 Sep 2013 04:50:40 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49125) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VGPqE-0005GN-VB for qemu-devel@nongnu.org; Mon, 02 Sep 2013 04:50:35 -0400 From: Kevin Wolf Date: Mon, 2 Sep 2013 10:49:32 +0200 Message-Id: <1378111792-20436-7-git-send-email-kwolf@redhat.com> In-Reply-To: <1378111792-20436-1-git-send-email-kwolf@redhat.com> References: <1378111792-20436-1-git-send-email-kwolf@redhat.com> Subject: [Qemu-devel] [PULL v2 06/26] block/qcow2.h: Avoid "1LL << 63" (shifts into sign bit) List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: anthony@codemonkey.ws Cc: kwolf@redhat.com, qemu-devel@nongnu.org From: Peter Maydell The expression "1LL << 63" tries to shift the 1 into the sign bit of a 'long long', which provokes a clang sanitizer warning: runtime error: left shift of 1 by 63 places cannot be represented in type 'long long' Use "1ULL << 63" as the definition of QCOW_OFLAG_COPIED instead to avoid this. For consistency, we also update the other QCOW_OFLAG definitions to use the ULL suffix rather than LL, though only the shift by 63 is undefined behaviour. Signed-off-by: Peter Maydell Reviewed-by: Eric Blake Signed-off-by: Kevin Wolf --- block/qcow2.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/block/qcow2.h b/block/qcow2.h index dba9771..365a17e 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -40,11 +40,11 @@ #define QCOW_MAX_CRYPT_CLUSTERS 32 /* indicate that the refcount of the referenced cluster is exactly one. */ -#define QCOW_OFLAG_COPIED (1LL << 63) +#define QCOW_OFLAG_COPIED (1ULL << 63) /* indicate that the cluster is compressed (they never have the copied flag) */ -#define QCOW_OFLAG_COMPRESSED (1LL << 62) +#define QCOW_OFLAG_COMPRESSED (1ULL << 62) /* The cluster reads as all zeros */ -#define QCOW_OFLAG_ZERO (1LL << 0) +#define QCOW_OFLAG_ZERO (1ULL << 0) #define REFCOUNT_SHIFT 1 /* refcount size is 2 bytes */ -- 1.8.1.4