compiler.h: move __is_constexpr() to compiler.h

Prior to f747e6667ebb2 __is_constexpr() was in its only user minmax.h.
That commit moved it to const.h - but that file just defines ULL(x) and
UL(x) so that constants can be defined for .S and .c files.

So apart from the word 'const' it wasn't really a good location.  Instead
move the definition to compiler.h just before the similar

  is_signed_type() and is_unsigned_type().

This may not be a good long-term home, but the three definitions belong
together.

Link: https://lkml.kernel.org/r/2a6680bbe2e84459816a113730426782@AcuMS.aculab.com
Signed-off-by: David Laight <david.laight@aculab.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 174099fdc485c4d6468772c517835aad3bcd5842..bb1339c7057b49c877907e9db968e828a28d0f3f 100644 (file)
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -227,6 +227,14 @@ static inline void *offset_to_ptr(const int *off)
 /* &a[0] degrades to a pointer: a different type from an array */
 #define __must_be_array(a)     BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
 
+/*
+ * This returns a constant expression while determining if an argument is
+ * a constant expression, most importantly without evaluating the argument.
+ * Glory to Martin Uecker <Martin.Uecker@med.uni-goettingen.de>
+ */
+#define __is_constexpr(x) \
+       (sizeof(int) == sizeof(*(8 ? ((void *)((long)(x) * 0l)) : (int *)8)))
+
 /*
  * Whether 'type' is a signed type or an unsigned type. Supports scalar types,
  * bool and also pointer types.

diff --git a/include/linux/const.h b/include/linux/const.h
index 435ddd72d2c464fdedd33889190009dde0a3bda9..81b8aae5a8559c9fabf0665c48d8e8659db4f239 100644 (file)
--- a/include/linux/const.h
+++ b/include/linux/const.h
@@ -3,12 +3,4 @@
 
 #include <vdso/const.h>
 
-/*
- * This returns a constant expression while determining if an argument is
- * a constant expression, most importantly without evaluating the argument.
- * Glory to Martin Uecker <Martin.Uecker@med.uni-goettingen.de>
- */
-#define __is_constexpr(x) \
-       (sizeof(int) == sizeof(*(8 ? ((void *)((long)(x) * 0l)) : (int *)8)))
-
 #endif /* _LINUX_CONST_H */

diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h
index 1684216e826a3547b748d60eab068e3e375d9068..7b65566f3e427254615da2cabf09962caa93369b 100644 (file)
--- a/tools/include/linux/compiler.h
+++ b/tools/include/linux/compiler.h
@@ -63,6 +63,14 @@
 # define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
 #endif
 
+/*
+ * This returns a constant expression while determining if an argument is
+ * a constant expression, most importantly without evaluating the argument.
+ * Glory to Martin Uecker <Martin.Uecker@med.uni-goettingen.de>
+ */
+#define __is_constexpr(x) \
+       (sizeof(int) == sizeof(*(8 ? ((void *)((long)(x) * 0l)) : (int *)8)))
+
 #ifdef __ANDROID__
 /*
  * FIXME: Big hammer to get rid of tons of:

diff --git a/tools/include/linux/const.h b/tools/include/linux/const.h
index 435ddd72d2c464fdedd33889190009dde0a3bda9..81b8aae5a8559c9fabf0665c48d8e8659db4f239 100644 (file)
--- a/tools/include/linux/const.h
+++ b/tools/include/linux/const.h
@@ -3,12 +3,4 @@
 
 #include <vdso/const.h>
 
-/*
- * This returns a constant expression while determining if an argument is
- * a constant expression, most importantly without evaluating the argument.
- * Glory to Martin Uecker <Martin.Uecker@med.uni-goettingen.de>
- */
-#define __is_constexpr(x) \
-       (sizeof(int) == sizeof(*(8 ? ((void *)((long)(x) * 0l)) : (int *)8)))
-
 #endif /* _LINUX_CONST_H */