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From: John Ogness <john.ogness@linutronix.de>
Date: Thu, 28 Mar 2024 13:29:10 +0000
Subject: [PATCH 36/46] printk: Provide helper for message prepending
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.9/older/patches-6.9-rt5.tar.xz
In order to support prepending different texts to printk
messages, split out the prepending code into a helper
function.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/printk/printk.c | 38 +++++++++++++++++++++++++++-----------
1 file changed, 27 insertions(+), 11 deletions(-)
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2806,30 +2806,25 @@ static void __console_unlock(void)
#ifdef CONFIG_PRINTK
/*
- * Prepend the message in @pmsg->pbufs->outbuf with a "dropped message". This
- * is achieved by shifting the existing message over and inserting the dropped
- * message.
+ * Prepend the message in @pmsg->pbufs->outbuf with the message in
+ * @pmsg->pbufs->scratchbuf. This is achieved by shifting the existing message
+ * over and inserting the scratchbuf message.
*
* @pmsg is the printk message to prepend.
*
- * @dropped is the dropped count to report in the dropped message.
+ * @len is the length of the message in @pmsg->pbufs->scratchbuf.
*
* If the message text in @pmsg->pbufs->outbuf does not have enough space for
- * the dropped message, the message text will be sufficiently truncated.
+ * the scratchbuf message, the message text will be sufficiently truncated.
*
* If @pmsg->pbufs->outbuf is modified, @pmsg->outbuf_len is updated.
*/
-void console_prepend_dropped(struct printk_message *pmsg, unsigned long dropped)
+static void __console_prepend_scratch(struct printk_message *pmsg, size_t len)
{
struct printk_buffers *pbufs = pmsg->pbufs;
- const size_t scratchbuf_sz = sizeof(pbufs->scratchbuf);
const size_t outbuf_sz = sizeof(pbufs->outbuf);
char *scratchbuf = &pbufs->scratchbuf[0];
char *outbuf = &pbufs->outbuf[0];
- size_t len;
-
- len = scnprintf(scratchbuf, scratchbuf_sz,
- "** %lu printk messages dropped **\n", dropped);
/*
* Make sure outbuf is sufficiently large before prepending.
@@ -2852,6 +2847,27 @@ void console_prepend_dropped(struct prin
}
/*
+ * Prepend the message in @pmsg->pbufs->outbuf with a "dropped message".
+ * @pmsg->outbuf_len is updated appropriately.
+ *
+ * @pmsg is the printk message to prepend.
+ *
+ * @dropped is the dropped count to report in the dropped message.
+ */
+void console_prepend_dropped(struct printk_message *pmsg, unsigned long dropped)
+{
+ struct printk_buffers *pbufs = pmsg->pbufs;
+ const size_t scratchbuf_sz = sizeof(pbufs->scratchbuf);
+ char *scratchbuf = &pbufs->scratchbuf[0];
+ size_t len;
+
+ len = scnprintf(scratchbuf, scratchbuf_sz,
+ "** %lu printk messages dropped **\n", dropped);
+
+ __console_prepend_scratch(pmsg, len);
+}
+
+/*
* Read and format the specified record (or a later record if the specified
* record is not available).
*
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