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From: Martin Radev <martin.b.radev@gmail.com>
To: kvm@vger.kernel.org
Cc: will@kernel.org, alexandru.elisei@arm.com,
	Martin Radev <martin.b.radev@gmail.com>
Subject: [PATCH v3 kvmtool 1/6] kvmtool: Add WARN_ONCE macro
Date: Mon,  9 May 2022 23:39:35 +0300	[thread overview]
Message-ID: <20220509203940.754644-2-martin.b.radev@gmail.com> (raw)
In-Reply-To: <20220509203940.754644-1-martin.b.radev@gmail.com>

Add a macro to enable to print a warning only once. This is
beneficial for cases where a warning could be helpful for
debugging, but still log pollution is preferred not to happen.

Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Martin Radev <martin.b.radev@gmail.com>
---
 include/kvm/util.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/kvm/util.h b/include/kvm/util.h
index d76568a..b494548 100644
--- a/include/kvm/util.h
+++ b/include/kvm/util.h
@@ -82,6 +82,16 @@ do {								\
 	__ret_warn_on;						\
 })
 
+#define WARN_ONCE(condition, format, args...) ({	\
+	static int __warned;							\
+	int __ret_warn_on = !!(condition);				\
+	if (!__warned && __ret_warn_on) {				\
+		__warned = 1;								\
+		pr_warning(format, args);					\
+	}												\
+	__ret_warn_on;									\
+})
+
 #define MSECS_TO_USECS(s) ((s) * 1000)
 
 /* Millisecond sleep */
-- 
2.25.1


  reply	other threads:[~2022-05-09 20:40 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-09 20:39 [PATCH v3 kvmtool 0/6] Fix few small issues in virtio code Martin Radev
2022-05-09 20:39 ` Martin Radev [this message]
2022-05-09 20:39 ` [PATCH v3 kvmtool 2/6] mmio: Sanitize addr and len Martin Radev
2022-05-11 17:26   ` Alexandru Elisei
2022-05-09 20:39 ` [PATCH v3 kvmtool 3/6] virtio: Use u32 instead of int in pci_data_in/out Martin Radev
2022-05-09 20:39 ` [PATCH v3 kvmtool 4/6] virtio: Sanitize config accesses Martin Radev
2022-05-12 10:29   ` Alexandru Elisei
2022-05-09 20:39 ` [PATCH v3 kvmtool 5/6] virtio: Check for overflows in QUEUE_NOTIFY and QUEUE_SEL Martin Radev
2022-05-09 20:39 ` [PATCH v3 kvmtool 6/6] kvmtool: Have stack be not executable on x86 Martin Radev
2022-05-20 20:51 ` [PATCH v3 kvmtool 0/6] Fix few small issues in virtio code Will Deacon

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