From: Jiri Kosina <[email protected]> In addition to having a per-process flag that shows which processess have already been "migrated", it's useful to have a global-wide flag that will show whether the patching operation is currently undergoing without having to traverse all /proc entries.
js: handle error Reported-by: Libor Pechacek <[email protected]> Signed-off-by: Jiri Kosina <[email protected]> Signed-off-by: Jiri Slaby <[email protected]> --- kernel/kgraft.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/kernel/kgraft.c b/kernel/kgraft.c index 89414957cf74..b427812c12cd 100644 --- a/kernel/kgraft.c +++ b/kernel/kgraft.c @@ -26,6 +26,8 @@ #include <linux/spinlock.h> #include <linux/types.h> #include <linux/workqueue.h> +#include <linux/seq_file.h> +#include <linux/proc_fs.h> static int kgr_patch_code(const struct kgr_patch *patch, struct kgr_patch_fun *patch_fun, bool final); @@ -382,6 +384,25 @@ unlock_free: } EXPORT_SYMBOL_GPL(kgr_start_patching); +static int kgr_show(struct seq_file *m, void *v) +{ + seq_printf(m, "%d\n", kgr_in_progress); + return 0; +} + +static int kgr_open(struct inode *inode, struct file *file) +{ + return single_open(file, kgr_show, NULL); +} + +static const struct file_operations kgr_fops = { + .owner = THIS_MODULE, + .open = kgr_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + static int __init kgr_init(void) { if (ftrace_is_dead()) { @@ -398,6 +419,9 @@ static int __init kgr_init(void) kgr_initialized = true; pr_info("kgr: successfully initialized\n"); + if (!proc_create("kgr_in_progress", 0, NULL, &kgr_fops)) + pr_warn("kgr: cannot create kgr_in_progress in procfs\n"); + return 0; } module_init(kgr_init); -- 2.0.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
