linux-kernel - [PATCH] Try both endianess when checking for endianess.

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Message-ID: <20080225192648.GA14357@linux-mips.org>
Date:	Mon, 25 Feb 2008 19:26:48 +0000
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	Chris Dearman <chris@...s.com>, linux-mips@...ux-mips.org
Subject: [PATCH] Try both endianess when checking for endianess.

From: Chris Dearman <chris@...s.com>

When checking for the swap header try byteswapping the endianess dependent
fields to allow the swap partition to be shared between big & little endian
systems.

Signed-off-by: Chris Dearman <chris@...s.com>
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>

 mm/swapfile.c |    8 ++++++++
 1 file changed, 8 insertions(+)

Index: linux-queue/mm/swapfile.c
===================================================================
--- linux-queue.orig/mm/swapfile.c
+++ linux-queue/mm/swapfile.c
@@ -1551,6 +1551,14 @@ asmlinkage long sys_swapon(const char __
 		error = -EINVAL;
 		goto bad_swap;
 	case 2:
+		/* swap partition endianess hack... */
+		if (swab32(swap_header->info.version) == 1) {
+			swab32s(&swap_header->info.version);
+			swab32s(&swap_header->info.last_page);
+			swab32s(&swap_header->info.nr_badpages);
+			for (i = 0; i < swap_header->info.nr_badpages; i++)
+				swab32s(&swap_header->info.badpages[i]);
+		}
 		/* Check the swap header's sub-version and the size of
                    the swap file and bad block lists */
 		if (swap_header->info.version != 1) {
--
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