kernel.h: add BUILD_BUG() macro

We can place this in definitions that we expect the compiler to remove by
dead code elimination.  If this assertion fails, we get a nice error
message at build time.

The GCC function attribute error("message") was added in version 4.3, so
we define a new macro __linktime_error(message) to expand to this for
GCC-4.3 and later.  This will give us an error diagnostic from the
compiler on the line that fails.  For other compilers
__linktime_error(message) expands to nothing, and we have to be content
with a link time error, but at least we will still get a build error.

BUILD_BUG() expands to the undefined function __build_bug_failed() and
will fail at link time if the compiler ever emits code for it.  On GCC-4.3
and later, attribute((error())) is used so that the failure will be noted
at compile time instead.

Signed-off-by: David Daney <david.daney@cavium.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: DM <dm.n9107@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h
index dfadc96e9d63851c334885f0ec7761c8d6cfe3ff..2f4079175afb81f80f641e28da9b1145b5415bae 100644 (file)
--- a/include/linux/compiler-gcc4.h
+++ b/include/linux/compiler-gcc4.h
@@ -29,6 +29,7 @@
    the kernel context */
 #define __cold                 __attribute__((__cold__))
 
+#define __linktime_error(message) __attribute__((__error__(message)))
 
 #if __GNUC_MINOR__ >= 5
 /*

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 320d6c94ff848d5db94fb1fd76576501a88e9a3a..4a243546d142b3e0264b115332bf73e354aa0fdf 100644 (file)
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -293,7 +293,9 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
 #ifndef __compiletime_error
 # define __compiletime_error(message)
 #endif
-
+#ifndef __linktime_error
+# define __linktime_error(message)
+#endif
 /*
  * Prevent the compiler from merging or refetching accesses.  The compiler
  * is also forbidden from reordering successive instances of ACCESS_ONCE(),

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index ff83683c0b9d446a43b01411e434ef4e462c28a3..34ce1102b1c796ba7ef10aca83b328b1d89b130b 100644 (file)
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -666,6 +666,7 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
 #define BUILD_BUG_ON_ZERO(e) (0)
 #define BUILD_BUG_ON_NULL(e) ((void*)0)
 #define BUILD_BUG_ON(condition)
+#define BUILD_BUG() (0)
 #else /* __CHECKER__ */
 
 /* Force a compilation error if a constant expression is not a power of 2 */
@@ -704,6 +705,21 @@ extern int __build_bug_on_failed;
                if (condition) __build_bug_on_failed = 1;       \
        } while(0)
 #endif
+
+/**
+ * BUILD_BUG - break compile if used.
+ *
+ * If you have some code that you expect the compiler to eliminate at
+ * build time, you should use BUILD_BUG_ON_USED to detect if it is
+ * unexpectedly used.
+ */
+#define BUILD_BUG()                                            \
+       do {                                                    \
+               extern void __build_bug_failed(void)            \
+                       __linktime_error("BUILD_BUG failed");   \
+               __build_bug_failed();                           \
+       } while (0)
+
 #endif /* __CHECKER__ */
 
 /* Trap pasters of __FUNCTION__ at compile-time */