Re: [PATCH v6 3/8] kmsg: introduce additional kmsg devices support

From: Marcin Niesluchowski <redacted>

kmsg device provides operations on cyclic logging buffer used mainly
by kernel but also in userspace by privileged processes.

Additional kmsg devices keep the same log format but may be added
dynamically with custom size.

Signed-off-by: Marcin Niesluchowski <redacted>
Signed-off-by: Paul Osmialowski <redacted>
[Rebased kmsg patch v5 on Linux 4.5-rc5]
Signed-off-by: Kazimierz Krosman <redacted>

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 3653a8e..b99403b 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c

@@ -584,9 +595,11 @@ ssize_t msg_print_ext_body(char *buf, size_t size,
 void log_buf_kexec_setup(void)
 {
 	VMCOREINFO_SYMBOL(log_buf);
-	VMCOREINFO_SYMBOL(log_buf_len);
-	VMCOREINFO_SYMBOL(log_first_idx);
-	VMCOREINFO_SYMBOL(log_next_idx);
+	VMCOREINFO_STRUCT_SIZE(log_buffer);
+	VMCOREINFO_OFFSET(log_buffer, buf);
+	VMCOREINFO_OFFSET(log_buffer, len);
+	VMCOREINFO_OFFSET(log_buffer, first_idx);
+	VMCOREINFO_OFFSET(log_buffer, next_idx);