linux-kernel - [PATCH v2 1/4] bug: Remove redundant condition check in report

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Message-Id: <20210223155759.3495252-2-ascull@google.com>
Date:   Tue, 23 Feb 2021 15:57:56 +0000
From:   Andrew Scull <ascull@...gle.com>
To:     kvmarm@...ts.cs.columbia.edu
Cc:     linux-kernel@...r.kernel.org, maz@...nel.org, james.morse@....com,
        suzuki.poulose@....com, julien.thierry.kdev@...il.com,
        will@...nel.org, catalin.marinas@....com, kernel-team@...roid.com,
        Andrew Scull <ascull@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Subject: [PATCH v2 1/4] bug: Remove redundant condition check in report_bug

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.

Signed-off-by: Andrew Scull <ascull@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
---
 lib/bug.c | 33 +++++++++++++++------------------
 1 file changed, 15 insertions(+), 18 deletions(-)

diff --git a/lib/bug.c b/lib/bug.c
index 7103440c0ee1..4ab398a2de93 100644
--- a/lib/bug.c
+++ b/lib/bug.c
@@ -158,30 +158,27 @@ 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;
 	}
 
 	/*
-- 
2.30.0.617.g56c4b15f3c-goog