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>

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 9b4f110..060b961 100644 (file)
--- 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 554ee68..5c114c3 100644 (file)
--- 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"