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From: Sascha Hauer <s.hauer@pengutronix.de>
To: Barebox List <barebox@lists.infradead.org>
Cc: "Daniel Glöckner" <dg@emlix.com>
Subject: [PATCH 19/21] Add WARN_ONCE() macro
Date: Fri, 19 Jun 2020 09:44:25 +0200	[thread overview]
Message-ID: <20200619074427.17289-20-s.hauer@pengutronix.de> (raw)
In-Reply-To: <20200619074427.17289-1-s.hauer@pengutronix.de>

This adds WARN_ONCE from the Linux Kernel. It is useful to warn only
once when we would otherwise spam the log.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 include/asm-generic/bug.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 8583d2425f..82b78261fc 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -34,4 +34,17 @@
 	unlikely(__ret_warn_on);					\
 })
 #endif
+
+#define WARN_ONCE(condition, format...) ({	\
+	static int __warned;			\
+	int __ret_warn_once = !!(condition);	\
+						\
+	if (unlikely(__ret_warn_once)) {	\
+		if (WARN(!__warned, format)) {	\
+			__warned = 1;		\
+			dump_stack();		\
+		}				\
+	}					\
+	unlikely(__ret_warn_once);		\
+})
 #endif
-- 
2.27.0


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  parent reply	other threads:[~2020-06-19  7:44 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-19  7:44 [PATCH v5 00/21] Slices and fastboot over UDP Sascha Hauer
2020-06-19  7:44 ` [PATCH 01/21] Introduce slices Sascha Hauer
2020-06-19  7:44 ` [PATCH 02/21] Add workqueues Sascha Hauer
2020-06-19  7:44 ` [PATCH 03/21] ratp: Switch to workqueues Sascha Hauer
2020-06-19  7:44 ` [PATCH 04/21] net: Add a slice to struct eth_device Sascha Hauer
2020-06-19  7:44 ` [PATCH 05/21] net: mdiobus: Add slice Sascha Hauer
2020-06-19  7:44 ` [PATCH 06/21] usb: Add a slice to usb host controllers Sascha Hauer
2020-06-19  7:44 ` [PATCH 07/21] usbnet: Add slice Sascha Hauer
2020-06-19  7:44 ` [PATCH 08/21] net: Call net_poll() in a poller Sascha Hauer
2020-06-19  7:44 ` [PATCH 09/21] net: reply to ping requests Sascha Hauer
2020-06-19  7:44 ` [PATCH 10/21] usbnet: Be more friendly in the receive path Sascha Hauer
2020-06-19  7:44 ` [PATCH 11/21] defconfigs: update renamed fastboot options Sascha Hauer
2020-06-19  7:44 ` [PATCH 12/21] globalvar: Add helper for deprecated variable names Sascha Hauer
2020-06-19  7:44 ` [PATCH 13/21] fastboot: rename usbgadget.fastboot_* variables to fastboot.* Sascha Hauer
2020-06-19  7:44 ` [PATCH 14/21] fastboot: Warn when cb_download is called with file still open Sascha Hauer
2020-06-19  7:44 ` [PATCH 15/21] fastboot: Add fastboot_abort() Sascha Hauer
2020-06-19  7:44 ` [PATCH 16/21] fastboot: init list head in common Sascha Hauer
2020-06-19  7:44 ` [PATCH 17/21] fastboot net: implement fastboot over UDP Sascha Hauer
2020-06-29 19:50   ` Daniel Glöckner
2020-07-11  4:48     ` Sascha Hauer
2020-08-13 10:38     ` Sascha Hauer
2020-06-19  7:44 ` [PATCH 18/21] usb: fastboot: execute commands in command context Sascha Hauer
2020-06-19  7:44 ` Sascha Hauer [this message]
2020-06-19  7:44 ` [PATCH 20/21] fs: Warn when filesystem operations are called from a poller Sascha Hauer
2020-06-19  7:44 ` [PATCH 21/21] Documentation: Add document for parallel execution in barebox Sascha Hauer

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