add CONFIG_ENABLE_MUST_CHECK

Those 1500 warnings can be a bit of a pain.  Add a config option to shut them
up.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 9b4f11094937..060b96112ec6 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -99,6 +99,11 @@ extern void __chk_io_ptr(void __iomem *);
 #define __must_check
 #endif
 
+#ifndef CONFIG_ENABLE_MUST_CHECK
+#undef __must_check
+#define __must_check
+#endif
+
 /*
  * Allow us to avoid 'defined but not used' warnings on functions and data,
  * as well as force them to be emitted to the assembly file.
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 554ee688a9f8..5c114c3f03c5 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -8,6 +8,13 @@ config PRINTK_TIME
           operations.  This is useful for identifying long delays
           in kernel startup.
 
+config ENABLE_MUST_CHECK
+        bool "Enable __must_check logic"
+        default y
+        help
+          Enable the __must_check logic in the kernel build.  Disable this to
+          suppress the "warning: ignoring return value of 'foo', declared with
+          attribute warn_unused_result" messages.
 
 config MAGIC_SYSRQ
         bool "Magic SysRq key"