From: Steven Rostedt <rostedt@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: "Masami Hiramatsu" <mhiramat@kernel.org>,
"Mark Rutland" <mark.rutland@arm.com>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Michal Koutný" <mkoutny@suse.com>
Subject: [for-next][PATCH 10/11] tracing: Ensure optimized hashing works
Date: Tue, 30 Sep 2025 13:01:45 -0400 [thread overview]
Message-ID: <20250930170302.878862549@kernel.org> (raw)
In-Reply-To: 20250930170135.285740909@kernel.org
From: =?UTF-8?q?Michal=20Koutn=C3=BD?= <mkoutny@suse.com>
If ever PID_MAX_DEFAULT changes, it must be compatible with tracing
hashmaps assumptions.
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250924113810.2433478-1-mkoutny@suse.com
Link: https://lore.kernel.org/r/20240409110126.651e94cb@gandalf.local.home/
Signed-off-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
kernel/trace/trace_sched_switch.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index 518dfc74347a..c46d584ded3b 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -247,6 +247,8 @@ int trace_save_cmdline(struct task_struct *tsk)
if (!tsk->pid)
return 1;
+ BUILD_BUG_ON(!is_power_of_2(PID_MAX_DEFAULT));
+
tpid = tsk->pid & (PID_MAX_DEFAULT - 1);
/*
--
2.50.1
next prev parent reply other threads:[~2025-09-30 17:01 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-30 17:01 [for-next][PATCH 00/11] tracing: Updates for v6.18 Steven Rostedt
2025-09-30 17:01 ` [for-next][PATCH 01/11] tracing: Replace syscall RCU pointer assignment with READ/WRITE_ONCE() Steven Rostedt
2025-09-30 17:01 ` [for-next][PATCH 02/11] tracing: Have syscall trace events show "0x" for values greater than 10 Steven Rostedt
2025-09-30 17:01 ` [for-next][PATCH 03/11] tracing: Use vmalloc_array() to improve code Steven Rostedt
2025-09-30 17:01 ` [for-next][PATCH 04/11] tracing/osnoise: Use for_each_online_cpu() instead of for_each_cpu() Steven Rostedt
2025-09-30 17:01 ` [for-next][PATCH 05/11] tracing: Move buffer in trace_seq to end of struct Steven Rostedt
2025-09-30 17:01 ` [for-next][PATCH 06/11] tracing: Remove redundant 0 value initialization Steven Rostedt
2025-09-30 17:01 ` [for-next][PATCH 07/11] tracing: replace use of system_wq with system_percpu_wq Steven Rostedt
2025-09-30 17:01 ` [for-next][PATCH 08/11] tracing/osnoise: Replace kmalloc() + copy_from_user() with memdup_user() Steven Rostedt
2025-09-30 17:01 ` [for-next][PATCH 09/11] ftrace: Fix softlockup in ftrace_module_enable Steven Rostedt
2025-09-30 17:01 ` Steven Rostedt [this message]
2025-09-30 17:01 ` [for-next][PATCH 11/11] tracing: Fix lock imbalance in s_start() memory allocation failure path Steven Rostedt
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