printk: kmsg_dumper: remove @active field

All 6 kmsg_dumpers do not benefit from the @active flag:

  (provide their own synchronization)
  - arch/powerpc/kernel/nvram_64.c
  - arch/um/kernel/kmsg_dump.c
  - drivers/mtd/mtdoops.c
  - fs/pstore/platform.c

  (only dump on KMSG_DUMP_PANIC, which does not require
  synchronization)
  - arch/powerpc/platforms/powernv/opal-kmsg.c
  - drivers/hv/vmbus_drv.c

The other 2 kmsg_dump users also do not rely on @active:

  (hard-code @active to always be true)
  - arch/powerpc/xmon/xmon.c
  - kernel/debug/kdb/kdb_main.c

Therefore, @active can be removed.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20210303101528.29901-12-john.ogness@linutronix.de

arch/powerpc/xmon/xmon.c

@@ -3005,7 +3005,7 @@ print_address(unsigned long addr)
 static void
 dump_log_buf(void)
 {
-	struct kmsg_dumper dumper = { .active = 1 };
+	struct kmsg_dumper dumper;
 	unsigned char buf[128];
 	size_t len;
 

include/linux/kmsg_dump.h

@@ -36,7 +36,6 @@ enum kmsg_dump_reason {
  * 		through the record iterator
  * @max_reason:	filter for highest reason number that should be dumped
  * @registered:	Flag that specifies if this is already registered
- * @active:	Flag that specifies if this is currently dumping
  * @cur_seq:	Points to the oldest message to dump
  * @next_seq:	Points after the newest message to dump
  */
@@ -44,7 +43,6 @@ struct kmsg_dumper {
 	struct list_head list;
 	void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason);
 	enum kmsg_dump_reason max_reason;
-	bool active;
 	bool registered;
 
 	/* private state of the kmsg iterator */

kernel/debug/kdb/kdb_main.c

@@ -2101,7 +2101,7 @@ static int kdb_dmesg(int argc, const char **argv)
 	int adjust = 0;
 	int n = 0;
 	int skip = 0;
-	struct kmsg_dumper dumper = { .active = 1 };
+	struct kmsg_dumper dumper;
 	size_t len;
 	char buf[201];
 

kernel/printk/printk.c

@@ -3408,8 +3408,6 @@ void kmsg_dump(enum kmsg_dump_reason reason)
 			continue;
 
 		/* initialize iterator with data about the stored records */
-		dumper->active = true;
-
 		logbuf_lock_irqsave(flags);
 		dumper->cur_seq = latched_seq_read_nolock(&clear_seq);
 		dumper->next_seq = prb_next_seq(prb);
@@ -3417,9 +3415,6 @@ void kmsg_dump(enum kmsg_dump_reason reason)
 
 		/* invoke dumper which will iterate over records */
 		dumper->dump(dumper, reason);
-
-		/* reset iterator */
-		dumper->active = false;
 	}
 	rcu_read_unlock();
 }
@@ -3454,9 +3449,6 @@ bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper, bool syslog,
 
 	prb_rec_init_rd(&r, &info, line, size);
 
-	if (!dumper->active)
-		goto out;
-
 	/* Read text or count text lines? */
 	if (line) {
 		if (!prb_read_valid(prb, dumper->cur_seq, &r))
@@ -3542,7 +3534,7 @@ bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
 	bool ret = false;
 	bool time = printk_time;
 
-	if (!dumper->active || !buf || !size)
+	if (!buf || !size)
 		goto out;
 
 	logbuf_lock_irqsave(flags);