This ensures no compiler-generated floating-point code can appear
outside kernel_fpu_{begin,end}() sections, and some architectures
enforce this separation.
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Samuel Holland <samuel.holland@xxxxxxxxxx>
---
(no changes since v2)
Changes in v2:
- Declare test_fpu() in a header
lib/Makefile | 3 ++-
lib/test_fpu.h | 8 +++++++
lib/{test_fpu.c => test_fpu_glue.c} | 32 +------------------------
lib/test_fpu_impl.c | 37 +++++++++++++++++++++++++++++
4 files changed, 48 insertions(+), 32 deletions(-)
create mode 100644 lib/test_fpu.h
rename lib/{test_fpu.c => test_fpu_glue.c} (71%)
create mode 100644 lib/test_fpu_impl.c
diff --git a/lib/Makefile b/lib/Makefile
index ffc6b2341b45..fcb35bf50979 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -133,7 +133,8 @@ FPU_CFLAGS += $(call cc-option,-msse -mpreferred-stack-boundary=3,-mpreferred-st
endif
obj-$(CONFIG_TEST_FPU) += test_fpu.o
-CFLAGS_test_fpu.o += $(FPU_CFLAGS)
+test_fpu-y := test_fpu_glue.o test_fpu_impl.o
+CFLAGS_test_fpu_impl.o += $(FPU_CFLAGS)
# Some KUnit files (hooks.o) need to be built-in even when KUnit is a module,
# so we can't just use obj-$(CONFIG_KUNIT).
diff --git a/lib/test_fpu.h b/lib/test_fpu.h
new file mode 100644
index 000000000000..4459807084bc
--- /dev/null
+++ b/lib/test_fpu.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef _LIB_TEST_FPU_H
+#define _LIB_TEST_FPU_H
+
+int test_fpu(void);
+
+#endif
diff --git a/lib/test_fpu.c b/lib/test_fpu_glue.c
similarity index 71%
rename from lib/test_fpu.c
rename to lib/test_fpu_glue.c
index e82db19fed84..85963d7be826 100644
--- a/lib/test_fpu.c
+++ b/lib/test_fpu_glue.c
@@ -19,37 +19,7 @@
#include <linux/debugfs.h>
#include <asm/fpu/api.h>
-static int test_fpu(void)
-{
- /*
- * This sequence of operations tests that rounding mode is
- * to nearest and that denormal numbers are supported.
- * Volatile variables are used to avoid compiler optimizing
- * the calculations away.
- */
- volatile double a, b, c, d, e, f, g;
-
- a = 4.0;
- b = 1e-15;
- c = 1e-310;
-
- /* Sets precision flag */
- d = a + b;
-
- /* Result depends on rounding mode */
- e = a + b / 2;
-
- /* Denormal and very large values */
- f = b / c;
-
- /* Depends on denormal support */
- g = a + c * f;
-
- if (d > a && e > a && g > a)
- return 0;
- else
- return -EINVAL;
-}
+#include "test_fpu.h"
static int test_fpu_get(void *data, u64 *val)
{
diff --git a/lib/test_fpu_impl.c b/lib/test_fpu_impl.c
new file mode 100644
index 000000000000..777894dbbe86
--- /dev/null
+++ b/lib/test_fpu_impl.c
@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/errno.h>
+
+#include "test_fpu.h"
+
+int test_fpu(void)
+{
+ /*
+ * This sequence of operations tests that rounding mode is
+ * to nearest and that denormal numbers are supported.
+ * Volatile variables are used to avoid compiler optimizing
+ * the calculations away.
+ */
+ volatile double a, b, c, d, e, f, g;
+
+ a = 4.0;
+ b = 1e-15;
+ c = 1e-310;
+
+ /* Sets precision flag */
+ d = a + b;
+
+ /* Result depends on rounding mode */
+ e = a + b / 2;
+
+ /* Denormal and very large values */
+ f = b / c;
+
+ /* Depends on denormal support */
+ g = a + c * f;
+
+ if (d > a && e > a && g > a)
+ return 0;
+ else
+ return -EINVAL;
+}
--
2.44.0
