linux-kernel - [PATCH v2] panic: Remove oops

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Date:   Mon, 13 Dec 2021 16:12:23 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Arjan van de Ven <arjan@...ux.intel.com>
Subject: [PATCH v2] panic: Remove oops_id.

The oops id has been added as part of the end of trace marker for the
kerneloops.org project. The id is used to automatically identify duplicate
submissions of the same report. Identical looking reports with different
a id can be considered as the same oops occurred again.

The early initialisation of the oops_id can create a warning if the
random core is not yet fully initialized. On PREEMPT_RT it is
problematic if the id is initialized on demand from non preemptible
context.

The kernel oops project is not available since 2017.
Remove the oops_id and use 0 in the output in case parser rely on it.

Link: https://bugs.debian.org/953172
Cc: Arjan van de Ven <arjan@...ux.intel.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
v1…v2:
  - Use 0 avoid breakage in parsers.

 kernel/panic.c |   19 +------------------
 1 file changed, 1 insertion(+), 18 deletions(-)

--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -538,26 +538,9 @@ void oops_enter(void)
 		trigger_all_cpu_backtrace();
 }

-/*
- * 64-bit random ID for oopses:
- */
-static u64 oops_id;
-
-static int init_oops_id(void)
-{
-	if (!oops_id)
-		get_random_bytes(&oops_id, sizeof(oops_id));
-	else
-		oops_id++;
-
-	return 0;
-}
-late_initcall(init_oops_id);
-
 static void print_oops_end_marker(void)
 {
-	init_oops_id();
-	pr_warn("---[ end trace %016llx ]---\n", (unsigned long long)oops_id);
+	pr_warn("---[ end trace %016llx ]---\n", 0ULL);
 	pr_flush(1000, true);
 }