Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Yipeng Zou <zouyipeng@huawei.com>
To:     <linux-riscv@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
        <rostedt@goodmis.org>, <mingo@redhat.com>,
        <paul.walmsley@sifive.com>, <palmer@dabbelt.com>,
        <aou@eecs.berkeley.edu>
CC:     <liaochang1@huawei.com>, <chris.zjh@huawei.com>,
        <zouyipeng@huawei.com>
Subject: [PATCH 1/2] tracing: hold caller_addr to hardirq_{enable,disable}_ip
Date:   Thu, 1 Sep 2022 18:45:14 +0800
Message-ID: <20220901104515.135162-2-zouyipeng@huawei.com>
In-Reply-To: <20220901104515.135162-1-zouyipeng@huawei.com>
References: <20220901104515.135162-1-zouyipeng@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

Currently, The arguments passing to lockdep_hardirqs_{on,off} was fixed
in CALLER_ADDR0.
The function trace_hardirqs_on_caller should have been intended to use
caller_addr to represent the address that caller wants to be traced.

For example, lockdep log in riscv showing the last {enabled,disabled} at
__trace_hardirqs_{on,off} all the time(if called by):
[   57.853175] hardirqs last  enabled at (2519): __trace_hardirqs_on+0xc/0x14
[   57.853848] hardirqs last disabled at (2520): __trace_hardirqs_off+0xc/0x14

After use trace_hardirqs_xx_caller, we can get more effective information:
[   53.781428] hardirqs last  enabled at (2595): restore_all+0xe/0x66
[   53.782185] hardirqs last disabled at (2596): ret_from_exception+0xa/0x10

Signed-off-by: Yipeng Zou <zouyipeng@huawei.com>
---
 kernel/trace/trace_preemptirq.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_preemptirq.c b/kernel/trace/trace_preemptirq.c
index 95b58bd757ce..1e130da1b742 100644
--- a/kernel/trace/trace_preemptirq.c
+++ b/kernel/trace/trace_preemptirq.c
@@ -95,14 +95,14 @@ __visible void trace_hardirqs_on_caller(unsigned long caller_addr)
 	}
 
 	lockdep_hardirqs_on_prepare();
-	lockdep_hardirqs_on(CALLER_ADDR0);
+	lockdep_hardirqs_on(caller_addr);
 }
 EXPORT_SYMBOL(trace_hardirqs_on_caller);
 NOKPROBE_SYMBOL(trace_hardirqs_on_caller);
 
 __visible void trace_hardirqs_off_caller(unsigned long caller_addr)
 {
-	lockdep_hardirqs_off(CALLER_ADDR0);
+	lockdep_hardirqs_off(caller_addr);
 
 	if (!this_cpu_read(tracing_irq_cpu)) {
 		this_cpu_write(tracing_irq_cpu, 1);
-- 
2.17.1