sysdev: fix prototype for memory_sysdev_class show/store functions
The function prototype mismatches in call stack:
[<ffffffff81494268>] print_block_size+0x58/0x60
[<ffffffff81487e3f>] sysdev_class_show+0x1f/0x30
[<ffffffff811d629b>] sysfs_read_file+0xcb/0x1f0
[<ffffffff81176328>] vfs_read+0xc8/0x180
Due to prototype mismatch, print_block_size() will sprintf() into
*attribute instead of *buf, hence user space will read the initial
zeros from *buf:
$ hexdump /sys/devices/system/memory/block_size_bytes
0000000 0000 0000 0000 0000
0000008
After patch:
cat /sys/devices/system/memory/block_size_bytes
0x8000000
This complements commits c29af9636 and 4a0b2b4dbe.
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: "Zheng, Shaohui" <shaohui.zheng@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index bd02505..ae6b6c4 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -309,17 +309,19 @@
* Block size attribute stuff
*/
static ssize_t
-print_block_size(struct class *class, char *buf)
+print_block_size(struct sysdev_class *class,
+ struct sysdev_class_attribute *class_attr,
+ char *buf)
{
return sprintf(buf, "%#lx\n", (unsigned long)PAGES_PER_SECTION * PAGE_SIZE);
}
-static CLASS_ATTR(block_size_bytes, 0444, print_block_size, NULL);
+static SYSDEV_CLASS_ATTR(block_size_bytes, 0444, print_block_size, NULL);
static int block_size_init(void)
{
return sysfs_create_file(&memory_sysdev_class.kset.kobj,
- &class_attr_block_size_bytes.attr);
+ &attr_block_size_bytes.attr);
}
/*
@@ -330,7 +332,9 @@
*/
#ifdef CONFIG_ARCH_MEMORY_PROBE
static ssize_t
-memory_probe_store(struct class *class, const char *buf, size_t count)
+memory_probe_store(struct sysdev_class *class,
+ struct sysdev_class_attribute *class_attr,
+ const char *buf, size_t count)
{
u64 phys_addr;
int nid;
@@ -346,12 +350,12 @@
return count;
}
-static CLASS_ATTR(probe, S_IWUSR, NULL, memory_probe_store);
+static SYSDEV_CLASS_ATTR(probe, S_IWUSR, NULL, memory_probe_store);
static int memory_probe_init(void)
{
return sysfs_create_file(&memory_sysdev_class.kset.kobj,
- &class_attr_probe.attr);
+ &attr_probe.attr);
}
#else
static inline int memory_probe_init(void)
@@ -367,7 +371,9 @@
/* Soft offline a page */
static ssize_t
-store_soft_offline_page(struct class *class, const char *buf, size_t count)
+store_soft_offline_page(struct sysdev_class *class,
+ struct sysdev_class_attribute *class_attr,
+ const char *buf, size_t count)
{
int ret;
u64 pfn;
@@ -384,7 +390,9 @@
/* Forcibly offline a page, including killing processes. */
static ssize_t
-store_hard_offline_page(struct class *class, const char *buf, size_t count)
+store_hard_offline_page(struct sysdev_class *class,
+ struct sysdev_class_attribute *class_attr,
+ const char *buf, size_t count)
{
int ret;
u64 pfn;
@@ -397,18 +405,18 @@
return ret ? ret : count;
}
-static CLASS_ATTR(soft_offline_page, 0644, NULL, store_soft_offline_page);
-static CLASS_ATTR(hard_offline_page, 0644, NULL, store_hard_offline_page);
+static SYSDEV_CLASS_ATTR(soft_offline_page, 0644, NULL, store_soft_offline_page);
+static SYSDEV_CLASS_ATTR(hard_offline_page, 0644, NULL, store_hard_offline_page);
static __init int memory_fail_init(void)
{
int err;
err = sysfs_create_file(&memory_sysdev_class.kset.kobj,
- &class_attr_soft_offline_page.attr);
+ &attr_soft_offline_page.attr);
if (!err)
err = sysfs_create_file(&memory_sysdev_class.kset.kobj,
- &class_attr_hard_offline_page.attr);
+ &attr_hard_offline_page.attr);
return err;
}
#else