kexec: crash: don't save swapper_pg_dir for !CONFIG_MMU configurations
authorWill Deacon <will.deacon@arm.com>
Wed, 28 Mar 2012 21:42:47 +0000 (14:42 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 29 Mar 2012 00:14:36 +0000 (17:14 -0700)
nommu platforms don't have very interesting swapper_pg_dir pointers and
usually just #define them to NULL, meaning that we can't include them in
the vmcoreinfo on the kexec crash path.

This patch only saves the swapper_pg_dir if we have an MMU.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Simon Horman <horms@verge.net.au>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/kexec.c

index a6a675cb9818ad43728ba7246472f62b44fcd23b..769e347c51967ee889e82ab1073da1e847aa30b2 100644 (file)
@@ -1462,7 +1462,9 @@ static int __init crash_save_vmcoreinfo_init(void)
 
        VMCOREINFO_SYMBOL(init_uts_ns);
        VMCOREINFO_SYMBOL(node_online_map);
+#ifdef CONFIG_MMU
        VMCOREINFO_SYMBOL(swapper_pg_dir);
+#endif
        VMCOREINFO_SYMBOL(_stext);
        VMCOREINFO_SYMBOL(vmlist);