bug: consolidate __WARN_FLAGS usage

Instead of having separate tests for __WARN_FLAGS, merge the two #ifdef
blocks and replace the synonym WANT_WARN_ON_SLOWPATH macro.

Link: http://lkml.kernel.org/r/20190819234111.9019-7-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@suse.de>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Drew Davenport <ddavenport@chromium.org>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
Cc: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 8 insertions, 12 deletions

diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 4b18e09094cf..b4a2639130a0 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -61,16 +61,6 @@ struct bug_entry {
 #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
 #endif
 
-#ifdef __WARN_FLAGS
-#define WARN_ON_ONCE(condition) ({                              \
-        int __ret_warn_on = !!(condition);                      \
-        if (unlikely(__ret_warn_on))                            \
-                __WARN_FLAGS(BUGFLAG_ONCE |                     \
-                             BUGFLAG_TAINT(TAINT_WARN));        \
-        unlikely(__ret_warn_on);                                \
-})
-#endif
-
 /*
  * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
  * significant kernel issues that need prompt attention if they should ever
@@ -91,7 +81,6 @@ struct bug_entry {
 extern __printf(4, 5)
 void warn_slowpath_fmt(const char *file, const int line, unsigned taint,
                        const char *fmt, ...);
-#define WANT_WARN_ON_SLOWPATH
 #define __WARN()                __WARN_printf(TAINT_WARN, NULL)
 #define __WARN_printf(taint, arg...)                                    \
         warn_slowpath_fmt(__FILE__, __LINE__, taint, arg)
@@ -105,6 +94,13 @@ extern __printf(1, 2) void __warn_printk(const char *fmt, ...);
                 __warn_printk(arg);                                     \
                 __WARN_FLAGS(BUGFLAG_TAINT(taint));                     \
         } while (0)
+#define WARN_ON_ONCE(condition) ({                              \
+        int __ret_warn_on = !!(condition);                      \
+        if (unlikely(__ret_warn_on))                            \
+                __WARN_FLAGS(BUGFLAG_ONCE |                     \
+                             BUGFLAG_TAINT(TAINT_WARN));        \
+        unlikely(__ret_warn_on);                                \
+})
 #endif
 
 /* used internally by panic.c */
diff --git a/kernel/panic.c b/kernel/panic.c
index a643e5464296..47e8ebccc22b 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -596,7 +596,7 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
         add_taint(taint, LOCKDEP_STILL_OK);
 }
 
-#ifdef WANT_WARN_ON_SLOWPATH
+#ifndef __WARN_FLAGS
 void warn_slowpath_fmt(const char *file, int line, unsigned taint,
                        const char *fmt, ...)
 {