openwrt/target/linux/goldfish/patches-2.6.30/0109-Revert-printk-remove-unused-code-from-kernel-print.patch

From fca2519ebf25db61da132932eb3fffeaa1974f43 Mon Sep 17 00:00:00 2001
From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
Date: Thu, 15 Jan 2009 19:07:27 -0800
Subject: [PATCH 109/134] Revert "printk: remove unused code from kernel/printk.c"

This reverts commit acff181d3574244e651913df77332e897b88bff4.
---
 kernel/printk.c |   39 +++++++++++++++++++++++++++++++++++++++
 1 files changed, 39 insertions(+), 0 deletions(-)

--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -255,6 +255,45 @@ static inline void boot_delay_msec(void)
 #endif
 
 /*
+ * Return the number of unread characters in the log buffer.
+ */
+static int log_buf_get_len(void)
+{
+	return logged_chars;
+}
+
+/*
+ * Copy a range of characters from the log buffer.
+ */
+int log_buf_copy(char *dest, int idx, int len)
+{
+	int ret, max;
+	bool took_lock = false;
+
+	if (!oops_in_progress) {
+		spin_lock_irq(&logbuf_lock);
+		took_lock = true;
+	}
+
+	max = log_buf_get_len();
+	if (idx < 0 || idx >= max) {
+		ret = -1;
+	} else {
+		if (len > max)
+			len = max;
+		ret = len;
+		idx += (log_end - max);
+		while (len-- > 0)
+			dest[len] = LOG_BUF(idx + len);
+	}
+
+	if (took_lock)
+		spin_unlock_irq(&logbuf_lock);
+
+	return ret;
+}
+
+/*
  * Commands to do_syslog:
  *
  * 	0 -- Close the log.  Currently a NOP.