printk: Export struct log size and member offsets through vmcoreinfo

[cascardo/linux.git] / kernel / printk.c

diff --git a/kernel/printk.c b/kernel/printk.c
index 4da2377..449364f 100644 (file)
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -671,6 +671,15 @@ void log_buf_kexec_setup(void)
        VMCOREINFO_SYMBOL(log_buf_len);
        VMCOREINFO_SYMBOL(log_first_idx);
        VMCOREINFO_SYMBOL(log_next_idx);
+       /*
+        * Export struct log size and field offsets. User space tools can
+        * parse it and detect any changes to structure down the line.
+        */
+       VMCOREINFO_STRUCT_SIZE(log);
+       VMCOREINFO_OFFSET(log, ts_nsec);
+       VMCOREINFO_OFFSET(log, len);
+       VMCOREINFO_OFFSET(log, text_len);
+       VMCOREINFO_OFFSET(log, dict_len);
 }
 #endif