linux-kernel - [PATCH v2 2/4] bug: Factor out a getter for a bug's file line

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Date:   Tue, 23 Feb 2021 15:57:57 +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 2/4] bug: Factor out a getter for a bug's file line

There is some non-trivial config-based logic to get the file name and
line number associated with a bug. Factor this out to a getter that can
be resused.

Signed-off-by: Andrew Scull <ascull@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
---
 include/linux/bug.h |  3 +++
 lib/bug.c           | 27 +++++++++++++++++----------
 2 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/include/linux/bug.h b/include/linux/bug.h
index f639bd0122f3..e3841bee4c8d 100644
--- a/include/linux/bug.h
+++ b/include/linux/bug.h
@@ -36,6 +36,9 @@ static inline int is_warning_bug(const struct bug_entry *bug)
 	return bug->flags & BUGFLAG_WARNING;
 }
 
+void bug_get_file_line(struct bug_entry *bug, const char **file,
+		       unsigned int *line);
+
 struct bug_entry *find_bug(unsigned long bugaddr);
 
 enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs);
diff --git a/lib/bug.c b/lib/bug.c
index 4ab398a2de93..f936615176b8 100644
--- a/lib/bug.c
+++ b/lib/bug.c
@@ -130,6 +130,22 @@ static inline struct bug_entry *module_find_bug(unsigned long bugaddr)
 }
 #endif
 
+void bug_get_file_line(struct bug_entry *bug, const char **file,
+		       unsigned int *line)
+{
+	*file = NULL;
+	*line = 0;
+
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
+	*file = bug->file;
+#else
+	*file = (const char *)bug + bug->file_disp;
+#endif
+	*line = bug->line;
+#endif
+}
+
 struct bug_entry *find_bug(unsigned long bugaddr)
 {
 	struct bug_entry *bug;
@@ -156,17 +172,8 @@ enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
 
 	disable_trace_on_warning();
 
-	file = NULL;
-	line = 0;
+	bug_get_file_line(bug, &file, &line);
 
-#ifdef CONFIG_DEBUG_BUGVERBOSE
-#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
-	file = bug->file;
-#else
-	file = (const char *)bug + bug->file_disp;
-#endif
-	line = bug->line;
-#endif
 	warning = (bug->flags & BUGFLAG_WARNING) != 0;
 	once = (bug->flags & BUGFLAG_ONCE) != 0;
 	done = (bug->flags & BUGFLAG_DONE) != 0;
-- 
2.30.0.617.g56c4b15f3c-goog