ACPI: introduce drivers/acpi/debugfs.c

Introduce drivers/acpi/debugfs.c.

Code for ACPI debugfs I/F,
i.e. /sys/kernel/debug/acpi/custom_method,
is moved to this file.

And make ACPI debugfs always built in,
even if CONFIG_ACPI_DEBUG is cleared.

BTW:this adds about 400bytes code to ACPI, when
CONFIG_ACPI_DEBUG is cleared.

[uaccess.h build fix from Andrew Morton <akpm@linux-foundation.org>]

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 0 insertions, 75 deletions

diff --git a/drivers/acpi/debug.c b/drivers/acpi/debug.c
index 146135e7a6a1..22476eab2b08 100644
--- a/drivers/acpi/debug.c
+++ b/drivers/acpi/debug.c
@@ -198,80 +198,6 @@ module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
                   NULL, 0644);
 
 /* --------------------------------------------------------------------------
-                                DebugFS Interface
-   -------------------------------------------------------------------------- */
-
-static ssize_t cm_write(struct file *file, const char __user *user_buf,
-                        size_t count, loff_t *ppos)
-{
-        static char *buf;
-        static int uncopied_bytes;
-        struct acpi_table_header table;
-        acpi_status status;
-
-        if (!(*ppos)) {
-                /* parse the table header to get the table length */
-                if (count <= sizeof(struct acpi_table_header))
-                        return -EINVAL;
-                if (copy_from_user(&table, user_buf,
-                        sizeof(struct acpi_table_header)))
-                        return -EFAULT;
-                uncopied_bytes = table.length;
-                buf = kzalloc(uncopied_bytes, GFP_KERNEL);
-                if (!buf)
-                        return -ENOMEM;
-        }
-
-        if (uncopied_bytes < count) {
-                kfree(buf);
-                return -EINVAL;
-        }
-
-        if (copy_from_user(buf + (*ppos), user_buf, count)) {
-                kfree(buf);
-                return -EFAULT;
-        }
-
-        uncopied_bytes -= count;
-        *ppos += count;
-
-        if (!uncopied_bytes) {
-                status = acpi_install_method(buf);
-                kfree(buf);
-                if (ACPI_FAILURE(status))
-                        return -EINVAL;
-                add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
-        }
-
-        return count;
-}
-
-static const struct file_operations cm_fops = {
-        .write = cm_write,
-};
-
-static int acpi_debugfs_init(void)
-{
-        struct dentry *acpi_dir, *cm_dentry;
-
-        acpi_dir = debugfs_create_dir("acpi", NULL);
-        if (!acpi_dir)
-                goto err;
-
-        cm_dentry = debugfs_create_file("custom_method", S_IWUGO,
-                                        acpi_dir, NULL, &cm_fops);
-        if (!cm_dentry)
-                goto err;
-
-        return 0;
-
-err:
-        if (acpi_dir)
-                debugfs_remove(acpi_dir);
-        return -EINVAL;
-}
-
-/* --------------------------------------------------------------------------
                               FS Interface (/proc)
    -------------------------------------------------------------------------- */
 #ifdef CONFIG_ACPI_PROCFS
@@ -400,7 +326,6 @@ int __init acpi_procfs_init(void)
 
 int __init acpi_debug_init(void)
 {
-        acpi_debugfs_init();
         acpi_procfs_init();
         return 0;
 }