[PATCH] audit: sort missing compat prototypes

[Ben Dooks <ben.dooks@codethink.co.uk>]

The comapt_xxx_class symbols aren't declared in anything that
lib/comapt_audit.c is including (arm64 build) which is causing
the following sparse warnings:

lib/compat_audit.c:7:10: warning: symbol 'compat_dir_class' was not declared. Should it be static?
lib/compat_audit.c:12:10: warning: symbol 'compat_read_class' was not declared. Should it be static?
lib/compat_audit.c:17:10: warning: symbol 'compat_write_class' was not declared. Should it be static?
lib/compat_audit.c:22:10: warning: symbol 'compat_chattr_class' was not declared. Should it be static?
lib/compat_audit.c:27:10: warning: symbol 'compat_signal_class' was not declared. Should it be static?

Trying to fix this by chaning compat_audit.c to inclde <linux/audit.h>
does not work on arm64 due to compile errors with the extra includes
that changing this header makes. The simpler thing would be just to
move the definitons of these symbols out of <linux/audit.h> into
<linux/audit_arch.h> which is included.

Fixes: 4b58841149dca ("audit: Add generic compat syscall support")
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
---
 include/linux/audit_arch.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/audit_arch.h b/include/linux/audit_arch.h
index 0e34d673ef17..2b8153791e6a 100644
--- a/include/linux/audit_arch.h
+++ b/include/linux/audit_arch.h
@@ -23,4 +23,11 @@ enum auditsc_class_t {
 
 extern int audit_classify_compat_syscall(int abi, unsigned syscall);
 
+/* only for compat system calls */
+extern unsigned compat_write_class[];
+extern unsigned compat_read_class[];
+extern unsigned compat_dir_class[];
+extern unsigned compat_chattr_class[];
+extern unsigned compat_signal_class[];
+
 #endif
-- 
2.37.2.352.g3c44437643