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From: Andrew Scull <ascull@google.com>
To: kvmarm@lists.cs.columbia.edu
Cc: kernel-team@android.com, Peter Zijlstra <peterz@infradead.org>,
	maz@kernel.org, "Steven Rostedt \(VMware\)" <rostedt@goodmis.org>,
	catalin.marinas@arm.com, will@kernel.org
Subject: [PATCH v3 1/5] bug: Remove redundant condition check in report_bug
Date: Thu, 18 Mar 2021 14:33:07 +0000	[thread overview]
Message-ID: <20210318143311.839894-2-ascull@google.com> (raw)
In-Reply-To: <20210318143311.839894-1-ascull@google.com>

report_bug() will return early if it cannot find a bug corresponding to
the provided address. The subsequent test for the bug will always be
true so remove it.

Fixes: 1b4cfe3c0a30d ("lib/bug.c: exclude non-BUG/WARN exceptions from report_bug()")
Signed-off-by: Andrew Scull <ascull@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 lib/bug.c | 33 +++++++++++++++------------------
 1 file changed, 15 insertions(+), 18 deletions(-)

diff --git a/lib/bug.c b/lib/bug.c
index 8f9d537bfb2a..b92da1f6e21b 100644
--- a/lib/bug.c
+++ b/lib/bug.c
@@ -155,30 +155,27 @@ enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
 
 	file = NULL;
 	line = 0;
-	warning = 0;
 
-	if (bug) {
 #ifdef CONFIG_DEBUG_BUGVERBOSE
 #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
-		file = bug->file;
+	file = bug->file;
 #else
-		file = (const char *)bug + bug->file_disp;
+	file = (const char *)bug + bug->file_disp;
 #endif
-		line = bug->line;
+	line = bug->line;
 #endif
-		warning = (bug->flags & BUGFLAG_WARNING) != 0;
-		once = (bug->flags & BUGFLAG_ONCE) != 0;
-		done = (bug->flags & BUGFLAG_DONE) != 0;
-
-		if (warning && once) {
-			if (done)
-				return BUG_TRAP_TYPE_WARN;
-
-			/*
-			 * Since this is the only store, concurrency is not an issue.
-			 */
-			bug->flags |= BUGFLAG_DONE;
-		}
+	warning = (bug->flags & BUGFLAG_WARNING) != 0;
+	once = (bug->flags & BUGFLAG_ONCE) != 0;
+	done = (bug->flags & BUGFLAG_DONE) != 0;
+
+	if (warning && once) {
+		if (done)
+			return BUG_TRAP_TYPE_WARN;
+
+		/*
+		 * Since this is the only store, concurrency is not an issue.
+		 */
+		bug->flags |= BUGFLAG_DONE;
 	}
 
 	/*
-- 
2.31.0.rc2.261.g7f71774620-goog

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  reply	other threads:[~2021-03-18 14:33 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-18 14:33 [PATCH v3 0/5] Debug info for nVHE hyp panics Andrew Scull
2021-03-18 14:33 ` Andrew Scull [this message]
2021-03-18 15:17   ` [PATCH v3 1/5] bug: Remove redundant condition check in report_bug Will Deacon
2021-03-18 14:33 ` [PATCH v3 2/5] bug: Factor out a getter for a bug's file line Andrew Scull
2021-03-18 15:19   ` Will Deacon
2021-03-18 14:33 ` [PATCH v3 3/5] bug: Assign values once in bug_get_file_line() Andrew Scull
2021-03-18 15:22   ` Will Deacon
2021-03-18 14:33 ` [PATCH v3 4/5] KVM: arm64: Use BUG and BUG_ON in nVHE hyp Andrew Scull
2021-03-18 15:25   ` Will Deacon
2021-03-18 14:33 ` [PATCH v3 5/5] KVM: arm64: Log source when panicking from " Andrew Scull
2021-03-18 16:59   ` Will Deacon
2021-03-19  9:51     ` Marc Zyngier
2021-03-19  9:59     ` Andrew Scull
2021-03-19 10:38       ` Andrew Scull
2021-03-19 10:42         ` Marc Zyngier
2021-04-01  9:26 ` [PATCH v3 0/5] Debug info for nVHE hyp panics Marc Zyngier

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