[PATCH v3 5/8] x86: Kill not used setup_data handling code

Yinghai Lu
2015-03-08T00:57:50Z

Cc: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
arch/x86/kernel/kdebugfs.c | 142 ---------------------------------------------
arch/x86/kernel/setup.c | 17 ------
2 files changed, 159 deletions(-)

diff --git a/arch/x86/kernel/kdebugfs.c b/arch/x86/kernel/kdebugfs.c
index dc1404b..c8ca86c 100644
--- a/arch/x86/kernel/kdebugfs.c
+++ b/arch/x86/kernel/kdebugfs.c
@@ -21,142 +21,6 @@ struct dentry *arch_debugfs_dir;
EXPORT_SYMBOL(arch_debugfs_dir);

#ifdef CONFIG_DEBUG_BOOT_PARAMS
-struct setup_data_node {
- u64 paddr;
- u32 type;
- u32 len;
-};
-
-static ssize_t setup_data_read(struct file *file, char __user *user_buf,
- size_t count, loff_t *ppos)
-{
- struct setup_data_node *node = file->private_data;
- unsigned long remain;
- loff_t pos = *ppos;
- struct page *pg;
- void *p;
- u64 pa;
-
- if (pos < 0)
- return -EINVAL;
-
- if (pos >= node->len)
- return 0;
-
- if (count > node->len - pos)
- count = node->len - pos;
-
- pa = node->paddr + sizeof(struct setup_data) + pos;
- pg = pfn_to_page((pa + count - 1) >> PAGE_SHIFT);
- if (PageHighMem(pg)) {
- p = ioremap_cache(pa, count);
- if (!p)
- return -ENXIO;
- } else
- p = __va(pa);
-
- remain = copy_to_user(user_buf, p, count);
-
- if (PageHighMem(pg))
- iounmap(p);
-
- if (remain)
- return -EFAULT;
-
- *ppos = pos + count;
-
- return count;
-}
-
-static const struct file_operations fops_setup_data = {
- .read = setup_data_read,
- .open = simple_open,
- .llseek = default_llseek,
-};
-
-static int __init
-create_setup_data_node(struct dentry *parent, int no,
- struct setup_data_node *node)
-{
- struct dentry *d, *type, *data;
- char buf[16];
-
- sprintf(buf, "%d", no);
- d = debugfs_create_dir(buf, parent);
- if (!d)
- return -ENOMEM;
-
- type = debugfs_create_x32("type", S_IRUGO, d, &node->type);
- if (!type)
- goto err_dir;
-
- data = debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data);
- if (!data)
- goto err_type;
-
- return 0;
-
-err_type:
- debugfs_remove(type);
-err_dir:
- debugfs_remove(d);
- return -ENOMEM;
-}
-
-static int __init create_setup_data_nodes(struct dentry *parent)
-{
- struct setup_data_node *node;
- struct setup_data *data;
- int error;
- struct dentry *d;
- struct page *pg;
- u64 pa_data;
- int no = 0;
-
- d = debugfs_create_dir("setup_data", parent);
- if (!d)
- return -ENOMEM;
-
- pa_data = boot_params.hdr.setup_data;
-
- while (pa_data) {
- node = kmalloc(sizeof(*node), GFP_KERNEL);
- if (!node) {
- error = -ENOMEM;
- goto err_dir;
- }
-
- pg = pfn_to_page((pa_data+sizeof(*data)-1) >> PAGE_SHIFT);
- if (PageHighMem(pg)) {
- data = ioremap_cache(pa_data, sizeof(*data));
- if (!data) {
- kfree(node);
- error = -ENXIO;
- goto err_dir;
- }
- } else
- data = __va(pa_data);
-
- node->paddr = pa_data;
- node->type = data->type;
- node->len = data->len;
- error = create_setup_data_node(d, no, node);
- pa_data = data->next;
-
- if (PageHighMem(pg))
- iounmap(data);
- if (error)
- goto err_dir;
- no++;
- }
-
- return 0;
-
-err_dir:
- debugfs_remove(d);
- return error;
-}
-
static struct debugfs_blob_wrapper boot_params_blob = {
.data = &boot_params,
.size = sizeof(boot_params),
@@ -181,14 +45,8 @@ static int __init boot_params_kdebugfs_init(void)
if (!data)
goto err_version;

- error = create_setup_data_nodes(dbp);
- if (error)
- goto err_data;
-
return 0;

-err_data:
- debugfs_remove(data);
err_version:
debugfs_remove(version);
err_dir:
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 94f95e0..a7e688c 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -486,20 +486,6 @@ static void __init parse_setup_data(void)
boot_params.hdr.setup_data = 0; /* all done */
}

-static void __init memblock_x86_reserve_range_setup_data(void)
-{
- struct setup_data *data;
- u64 pa_data;
-
- pa_data = boot_params.hdr.setup_data;
- while (pa_data) {
- data = early_memremap(pa_data, sizeof(*data));
- memblock_reserve(pa_data, sizeof(*data) + data->len);
- pa_data = data->next;
- early_iounmap(data, sizeof(*data));
- }
-}
-
/*
* --------- Crashkernel reservation ------------------------------
*/
@@ -1006,9 +992,6 @@ void __init setup_arch(char **cmdline_p)

x86_report_nx();

- /* after early param, so could get panic from serial */
- memblock_x86_reserve_range_setup_data();
-
if (acpi_mps_check()) {
#ifdef CONFIG_X86_LOCAL_APIC
disable_apic = 1;
--
1.8.4.5