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Commit 10cbda97 authored by Jens Axboe's avatar Jens Axboe
Browse files

cciss: add BUILD_BUG_ON() for catching bad CommandList_struct alignment 



The hardware requires 64-bit alignment of commands, so add a build bug
check for that. The recent commit 8a3173de
didn't change the size of the command, but other additions/changes may and
thus break badly at runtime.

Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent a7fcd37c

drivers/block/cciss.c

+7 −0
Original line number Diff line number Diff line
@@ -3898,6 +3898,13 @@ static struct pci_driver cciss_pci_driver = { 
 */

static int __init cciss_init(void)

{

	/*

	 * The hardware requires that commands are aligned on a 64-bit

	 * boundary. Given that we use pci_alloc_consistent() to allocate an

	 * array of them, the size must be a multiple of 8 bytes.

	 */

	BUILD_BUG_ON(sizeof(CommandList_struct) % 8);



	printk(KERN_INFO DRIVER_NAME "\n");



	/* Register for our PCI devices */