[LTP] [PATCH 1/2] m4: mprotect04: Replace __builtin___clear_cache with __clear_cache

[Petr Vorel]

__clear_cache() should be quite common now and we already use it in
hugemmap15.c. Convert autotools m4 check to detect it.

Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
---
 configure.ac                                  |  2 +-
 m4/ltp-builtin_clear_cache.m4                 | 19 ------------------
 m4/ltp-clear_cache.m4                         | 20 +++++++++++++++++++
 .../kernel/syscalls/mprotect/mprotect04.c     |  7 +++----
 4 files changed, 24 insertions(+), 24 deletions(-)
 delete mode 100644 m4/ltp-builtin_clear_cache.m4
 create mode 100644 m4/ltp-clear_cache.m4

diff --git a/configure.ac b/configure.ac
index 0480f46ca2..461fa2b577 100644
--- a/configure.ac
+++ b/configure.ac
@@ -393,9 +393,9 @@ AC_CONFIG_COMMANDS([syscalls.h], [cd ${ac_top_srcdir}/include/lapi/syscalls; ./g
 # NOTE: don't create custom functions for simple checks, put them into this file
 LTP_CHECK_ACL_SUPPORT
 LTP_CHECK_ATOMIC_MEMORY_MODEL
-LTP_CHECK_BUILTIN_CLEAR_CACHE
 LTP_CHECK_CAPABILITY_SUPPORT
 LTP_CHECK_CC_WARN_OLDSTYLE
+LTP_CHECK_CLEAR_CACHE
 LTP_CHECK_CRYPTO
 LTP_CHECK_FORTIFY_SOURCE
 LTP_CHECK_KERNEL_DEVEL
diff --git a/m4/ltp-builtin_clear_cache.m4 b/m4/ltp-builtin_clear_cache.m4
deleted file mode 100644
index 86e1cfc914..0000000000
--- a/m4/ltp-builtin_clear_cache.m4
+++ /dev/null
@@ -1,19 +0,0 @@
-dnl SPDX-License-Identifier: GPL-2.0-or-later
-dnl Copyright (c) Linux Test Project, 2016
-
-AC_DEFUN([LTP_CHECK_BUILTIN_CLEAR_CACHE],[
-	AC_MSG_CHECKING([for __builtin___clear_cache])
-	AC_LINK_IFELSE([AC_LANG_SOURCE([[
-int main(void) {
-	char arr[16];
-	__builtin___clear_cache(arr, arr + sizeof(arr));
-        return 0;
-}]])],[has_bcc="yes"])
-
-if test "x$has_bcc" = xyes; then
-	AC_DEFINE(HAVE_BUILTIN_CLEAR_CACHE,1,[Define to 1 if you have __builtin___clear_cache])
-	AC_MSG_RESULT(yes)
-else
-	AC_MSG_RESULT(no)
-fi
-])
diff --git a/m4/ltp-clear_cache.m4 b/m4/ltp-clear_cache.m4
new file mode 100644
index 0000000000..99c6a1b653
--- /dev/null
+++ b/m4/ltp-clear_cache.m4
@@ -0,0 +1,20 @@
+dnl SPDX-License-Identifier: GPL-2.0-or-later
+dnl Copyright (c) Linux Test Project, 2016
+dnl Copyright (c) Linux Test Project, 2025
+
+AC_DEFUN([LTP_CHECK_CLEAR_CACHE],[
+	AC_MSG_CHECKING([for __clear_cache])
+	AC_LINK_IFELSE([AC_LANG_SOURCE([[
+int main(void) {
+	char arr[16];
+	__clear_cache(arr, arr + sizeof(arr));
+        return 0;
+}]])],[has_clear_cache="yes"])
+
+if test "x$has_clear_cache" = xyes; then
+	AC_DEFINE(HAVE_CLEAR_CACHE, 1, [Define to 1 if you have __clear_cache])
+	AC_MSG_RESULT(yes)
+else
+	AC_MSG_RESULT(no)
+fi
+])
diff --git a/testcases/kernel/syscalls/mprotect/mprotect04.c b/testcases/kernel/syscalls/mprotect/mprotect04.c
index 6c7f6bd017..fa4d3be4ba 100644
--- a/testcases/kernel/syscalls/mprotect/mprotect04.c
+++ b/testcases/kernel/syscalls/mprotect/mprotect04.c
@@ -152,11 +152,10 @@ static int page_present(void *p)
 
 static void clear_cache(void *start, int len)
 {
-#if HAVE_BUILTIN_CLEAR_CACHE == 1
-	__builtin___clear_cache(start, start + len);
+#ifdef HAVE_CLEAR_CACHE
+	__clear_cache(start, start + len);
 #else
-	tst_brkm(TCONF, cleanup,
-		"compiler doesn't have __builtin___clear_cache()");
+	tst_brkm(TCONF, cleanup, "compiler doesn't have __clear_cache()");
 #endif
 }
 
-- 
2.51.0