From 8ff410daa009c4b44be445ded5b0cec00abc0426 Mon Sep 17 00:00:00 2001 From: Wu Fengguang Date: Fri, 15 Jan 2010 17:01:32 -0800 Subject: [PATCH] sysdev: fix prototype for memory_sysdev_class show/store functions The function prototype mismatches in call stack: [] print_block_size+0x58/0x60 [] sysdev_class_show+0x1f/0x30 [] sysfs_read_file+0xcb/0x1f0 [] 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 Cc: Andi Kleen Cc: Greg Kroah-Hartman Cc: "Zheng, Shaohui" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/base/memory.c | 32 ++++++++++++++++++++------------ 1 file changed, 20 insertions(+), 12 deletions(-) diff --git a/drivers/base/memory.c b/drivers/base/memory.c index bd025059711f..ae6b6c43cff9 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -309,17 +309,19 @@ static SYSDEV_ATTR(removable, 0444, show_mem_removable, NULL); * 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 @@ static int block_size_init(void) */ #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 @@ memory_probe_store(struct class *class, const char *buf, size_t count) 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 @@ static inline int memory_probe_init(void) /* 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 @@ store_soft_offline_page(struct class *class, const char *buf, size_t count) /* 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 @@ store_hard_offline_page(struct class *class, const char *buf, size_t count) 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 -- GitLab