x86, extable: Add early_fixup_exception()
Add a restricted version of fixup_exception() to be used during early
boot only. In particular, this doesn't support the try..catch variant
since we may not have a thread_info set up yet.
This relies on the exception table being sorted already at build time.
Link: http://lkml.kernel.org/r/1334794610-5546-1-git-send-email-hpa@zytor.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c
index 1fb85db..5555675 100644
--- a/arch/x86/mm/extable.c
+++ b/arch/x86/mm/extable.c
@@ -35,3 +35,20 @@
return 0;
}
+
+/* Restricted version used during very early boot */
+int __init early_fixup_exception(unsigned long *ip)
+{
+ const struct exception_table_entry *fixup;
+
+ fixup = search_exception_tables(*ip);
+ if (fixup) {
+ if (fixup->fixup < 16)
+ return 0; /* Not supported during early boot */
+
+ *ip = fixup->fixup;
+ return 1;
+ }
+
+ return 0;
+}