[v5 4/6] extable: Add function to search only kernel exception table

[Santosh Sivaraj]

In real mode, the search_exception tables cannot be called because
it also searches the module exception tables if entry is not found
in the kernel exception tables.

Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Nicholas Piggin <npig...@gmail.com>
Signed-off-by: Santosh Sivaraj <sant...@fossix.org>
---
 include/linux/extable.h |  2 ++
 kernel/extable.c        | 16 +++++++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/include/linux/extable.h b/include/linux/extable.h
index 41c5b3a25f67..0c2819ba67f0 100644
--- a/include/linux/extable.h
+++ b/include/linux/extable.h
@@ -19,6 +19,8 @@ void trim_init_extable(struct module *m);
 
 /* Given an address, look for it in the exception tables */
 const struct exception_table_entry *search_exception_tables(unsigned long add);
+const struct
+exception_table_entry *search_kernel_exception_table(unsigned long addr);
 
 #ifdef CONFIG_MODULES
 /* For extable.c to search modules' exception tables. */
diff --git a/kernel/extable.c b/kernel/extable.c
index e23cce6e6092..6d544cb79fff 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -40,13 +40,23 @@ void __init sort_main_extable(void)
        }
 }
 
-/* Given an address, look for it in the exception tables. */
+/* For the given address, look for it in the kernel exception table */
+const
+struct exception_table_entry *search_kernel_exception_table(unsigned long addr)
+{
+       return search_extable(__start___ex_table,
+                             __stop___ex_table - __start___ex_table, addr);
+}
+
+/*
+ * Given an address, look for it in the kernel and the module exception
+ * tables.
+ */
 const struct exception_table_entry *search_exception_tables(unsigned long addr)
 {
        const struct exception_table_entry *e;
 
-       e = search_extable(__start___ex_table,
-                          __stop___ex_table - __start___ex_table, addr);
+       e = search_kernel_exception_table(addr);
        if (!e)
                e = search_module_extables(addr);
        return e;
-- 
2.20.1