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authorArnaldo Carvalho de Melo <acme@redhat.com>2017-04-17 16:25:00 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-04-19 18:01:42 +0200
commitf6441aff8946f7fd6ab730d7eb9eba18a9ebeba4 (patch)
tree4bd16f3906dd5623bc73ae75dc006b4cf7dea48d /tools
parenttools include: Introduce linux/bug.h, from the kernel sources (diff)
downloadlinux-f6441aff8946f7fd6ab730d7eb9eba18a9ebeba4.tar.xz
linux-f6441aff8946f7fd6ab730d7eb9eba18a9ebeba4.zip
tools include: Adopt __same_type() and __must_be_array() from the kernel
Will be used to adopt the more stringent version of ARRAY_SIZE(), the one in the kernel sources. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-d85dpvay1hoqscpezlntyd8x@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/include/linux/compiler-gcc.h3
-rw-r--r--tools/include/linux/compiler.h5
2 files changed, 8 insertions, 0 deletions
diff --git a/tools/include/linux/compiler-gcc.h b/tools/include/linux/compiler-gcc.h
index 616935f1ff56..825d44f89a29 100644
--- a/tools/include/linux/compiler-gcc.h
+++ b/tools/include/linux/compiler-gcc.h
@@ -16,3 +16,6 @@
#if GCC_VERSION >= 40300
# define __compiletime_error(message) __attribute__((error(message)))
#endif /* GCC_VERSION >= 40300 */
+
+/* &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]))
diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h
index c9e65e8faacd..23299d7e7160 100644
--- a/tools/include/linux/compiler.h
+++ b/tools/include/linux/compiler.h
@@ -17,6 +17,11 @@
# define __always_inline inline __attribute__((always_inline))
#endif
+/* Are two types/vars the same type (ignoring qualifiers)? */
+#ifndef __same_type
+# define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
+#endif
+
#ifdef __ANDROID__
/*
* FIXME: Big hammer to get rid of tons of: