From: Julien Grall <julien@xen.org>
To: xen-devel@lists.xenproject.org
Cc: bertrand.marquis@arm.com, Rahul.Singh@arm.com,
Julien Grall <jgrall@amazon.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
George Dunlap <george.dunlap@citrix.com>,
Ian Jackson <iwj@xenproject.org>, Jan Beulich <jbeulich@suse.com>,
Julien Grall <julien@xen.org>,
Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wl@xen.org>
Subject: [PATCH] xen: Rework WARN_ON() to return whether a warning was triggered
Date: Tue, 15 Dec 2020 11:26:10 +0000 [thread overview]
Message-ID: <20201215112610.1986-1-julien@xen.org> (raw)
From: Julien Grall <jgrall@amazon.com>
So far, our implementation of WARN_ON() cannot be used in the following
situation:
if ( WARN_ON() )
...
This is because the WARN_ON() doesn't return whether a warning. Such
construction can be handy to have if you have to print more information
and now the stack track.
Rework the WARN_ON() implementation to return whether a warning was
triggered. The idea was borrowed from Linux.
Signed-off-by: Julien Grall <jgrall@amazon.com>
---
This will be used in the SMMUv3 driver (see [1]).
---
xen/include/xen/lib.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/xen/include/xen/lib.h b/xen/include/xen/lib.h
index a9679c913d5c..d10c68aa3c07 100644
--- a/xen/include/xen/lib.h
+++ b/xen/include/xen/lib.h
@@ -23,7 +23,13 @@
#include <asm/bug.h>
#define BUG_ON(p) do { if (unlikely(p)) BUG(); } while (0)
-#define WARN_ON(p) do { if (unlikely(p)) WARN(); } while (0)
+#define WARN_ON(p) ({ \
+ bool __ret_warn_on = (p); \
+ \
+ if ( unlikely(__ret_warn_on) ) \
+ WARN(); \
+ unlikely(__ret_warn_on); \
+})
/* All clang versions supported by Xen have _Static_assert. */
#if defined(__clang__) || \
--
2.17.1
next reply other threads:[~2020-12-15 11:26 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-15 11:26 Julien Grall [this message]
2020-12-15 11:31 ` [PATCH] xen: Rework WARN_ON() to return whether a warning was triggered Jürgen Groß
2020-12-15 13:11 ` Julien Grall
2020-12-15 16:20 ` Jürgen Groß
2020-12-17 17:58 ` Bertrand Marquis
2020-12-15 11:46 ` Jan Beulich
2020-12-15 13:19 ` Julien Grall
2020-12-15 14:01 ` Jan Beulich
2020-12-17 23:54 ` Stefano Stabellini
2020-12-18 0:29 ` Julien Grall
2020-12-18 7:54 ` Jan Beulich
2020-12-18 8:19 ` Jürgen Groß
2020-12-18 8:31 ` Jan Beulich
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