84 lines
3.1 KiB
Diff
84 lines
3.1 KiB
Diff
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From: John Ogness <john.ogness@linutronix.de>
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Date: Wed, 4 Sep 2024 14:11:29 +0206
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Subject: [PATCH 47/54] printk: Provide helper for message prepending
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.11/older/patches-6.11-rt7.tar.xz
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In order to support prepending different texts to printk
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messages, split out the prepending code into a helper
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function.
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Signed-off-by: John Ogness <john.ogness@linutronix.de>
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Reviewed-by: Petr Mladek <pmladek@suse.com>
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Link: https://lore.kernel.org/r/20240904120536.115780-11-john.ogness@linutronix.de
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Signed-off-by: Petr Mladek <pmladek@suse.com>
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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kernel/printk/printk.c | 36 +++++++++++++++++++++++++-----------
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1 file changed, 25 insertions(+), 11 deletions(-)
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--- a/kernel/printk/printk.c
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+++ b/kernel/printk/printk.c
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@@ -2844,30 +2844,31 @@ static void __console_unlock(void)
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#ifdef CONFIG_PRINTK
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/*
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- * Prepend the message in @pmsg->pbufs->outbuf with a "dropped message". This
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- * is achieved by shifting the existing message over and inserting the dropped
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- * message.
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+ * Prepend the message in @pmsg->pbufs->outbuf. This is achieved by shifting
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+ * the existing message over and inserting the scratchbuf message.
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*
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- * @pmsg is the printk message to prepend.
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- *
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- * @dropped is the dropped count to report in the dropped message.
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+ * @pmsg is the original printk message.
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+ * @fmt is the printf format of the message which will prepend the existing one.
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*
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- * If the message text in @pmsg->pbufs->outbuf does not have enough space for
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- * the dropped message, the message text will be sufficiently truncated.
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+ * If there is not enough space in @pmsg->pbufs->outbuf, the existing
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+ * message text will be sufficiently truncated.
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*
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* If @pmsg->pbufs->outbuf is modified, @pmsg->outbuf_len is updated.
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*/
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-void console_prepend_dropped(struct printk_message *pmsg, unsigned long dropped)
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+__printf(2, 3)
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+static void console_prepend_message(struct printk_message *pmsg, const char *fmt, ...)
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{
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struct printk_buffers *pbufs = pmsg->pbufs;
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const size_t scratchbuf_sz = sizeof(pbufs->scratchbuf);
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const size_t outbuf_sz = sizeof(pbufs->outbuf);
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char *scratchbuf = &pbufs->scratchbuf[0];
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char *outbuf = &pbufs->outbuf[0];
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+ va_list args;
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size_t len;
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- len = scnprintf(scratchbuf, scratchbuf_sz,
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- "** %lu printk messages dropped **\n", dropped);
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+ va_start(args, fmt);
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+ len = vscnprintf(scratchbuf, scratchbuf_sz, fmt, args);
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+ va_end(args);
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/*
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* Make sure outbuf is sufficiently large before prepending.
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@@ -2890,6 +2891,19 @@ void console_prepend_dropped(struct prin
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}
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/*
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+ * Prepend the message in @pmsg->pbufs->outbuf with a "dropped message".
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+ * @pmsg->outbuf_len is updated appropriately.
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+ *
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+ * @pmsg is the printk message to prepend.
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+ *
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+ * @dropped is the dropped count to report in the dropped message.
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+ */
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+void console_prepend_dropped(struct printk_message *pmsg, unsigned long dropped)
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+{
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+ console_prepend_message(pmsg, "** %lu printk messages dropped **\n", dropped);
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+}
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+
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+/*
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* Read and format the specified record (or a later record if the specified
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* record is not available).
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*
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