mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 08:58:07 +00:00
2a49c8b6b6
make allmodconfig && make W=1 C=1 now reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/test_fpu.o
Add the missing invocation of the MODULE_DESCRIPTION() macro.
Link: https://lkml.kernel.org/r/20240622-md-i386-lib-test_fpu_glue-v1-1-a4e40b7b1264@quicinc.com
Fixes: 9613736d85 ("selftests/fpu: move FP code to a separate translation unit")
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Test cases for using floating point operations inside a kernel module.
|
|
*
|
|
* This tests kernel_fpu_begin() and kernel_fpu_end() functions, especially
|
|
* when userland has modified the floating point control registers. The kernel
|
|
* state might depend on the state set by the userland thread that was active
|
|
* before a syscall.
|
|
*
|
|
* To facilitate the test, this module registers file
|
|
* /sys/kernel/debug/selftest_helpers/test_fpu, which when read causes a
|
|
* sequence of floating point operations. If the operations fail, either the
|
|
* read returns error status or the kernel crashes.
|
|
* If the operations succeed, the read returns "1\n".
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/fpu.h>
|
|
|
|
#include "test_fpu.h"
|
|
|
|
static int test_fpu_get(void *data, u64 *val)
|
|
{
|
|
int status = -EINVAL;
|
|
|
|
kernel_fpu_begin();
|
|
status = test_fpu();
|
|
kernel_fpu_end();
|
|
|
|
*val = 1;
|
|
return status;
|
|
}
|
|
|
|
DEFINE_DEBUGFS_ATTRIBUTE(test_fpu_fops, test_fpu_get, NULL, "%lld\n");
|
|
static struct dentry *selftest_dir;
|
|
|
|
static int __init test_fpu_init(void)
|
|
{
|
|
if (!kernel_fpu_available())
|
|
return -EINVAL;
|
|
|
|
selftest_dir = debugfs_create_dir("selftest_helpers", NULL);
|
|
if (!selftest_dir)
|
|
return -ENOMEM;
|
|
|
|
debugfs_create_file_unsafe("test_fpu", 0444, selftest_dir, NULL,
|
|
&test_fpu_fops);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit test_fpu_exit(void)
|
|
{
|
|
debugfs_remove(selftest_dir);
|
|
}
|
|
|
|
module_init(test_fpu_init);
|
|
module_exit(test_fpu_exit);
|
|
|
|
MODULE_DESCRIPTION("Test cases for floating point operations");
|
|
MODULE_LICENSE("GPL");
|