From: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
To: Joel Fernandes <joel@joelfernandes.org>,
Kees Cook <keescook@chromium.org>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Stephen Boyd <sboyd@kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Andy Gross <andy.gross@linaro.org>,
David Brown <david.brown@linaro.org>,
Jiri Slaby <jslaby@suse.com>,
"Ivan T. Ivanov" <ivan.ivanov@linaro.org>,
Geliang Tang <geliangtang@gmail.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Pramod Gurav <gpramod@codeaurora.org>,
linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org,
"open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Rajendra Nayak <rnayak@codeaurora.org>,
Vivek Gautam <vivek.gautam@codeaurora.org>,
Sibi Sankar <sibis@codeaurora.org>
Subject: Re: Crash in msm serial on dragonboard with ftrace bootargs
Date: Wed, 17 Oct 2018 20:19:41 +0530 [thread overview]
Message-ID: <69d2f43d-dc96-9348-7f70-5db88e8f5c39@codeaurora.org> (raw)
In-Reply-To: <2a23cd74-7364-0fb7-3c7b-7be79a881073@codeaurora.org>
On 10/17/2018 5:08 PM, Sai Prakash Ranjan wrote:
>>
>> What do you think about the (untested) patch below? It seems to me
>> that it
>> should solve the issue of missing early crash dumps, but I have not
>> tested it
>> yet. Sai, would you mind trying it out and let me know if you can see the
>> early crash dumps properly now?
>>
>> ----8<---
>> From: "Joel Fernandes (Google)" <joel@joelfernandes.org>
>> Subject: [RFC] pstore: allocate compression during late_initcall
>>
>> ramoop's pstore registration (using pstore_register) has to run during
>> late_initcall because crypto backend may not be ready during
>> postcore_initcall. This causes missing of dmesg crash dumps which could
>> have been caught by pstore.
>>
>> Instead, lets allow ramoops pstore registration earlier, and once crypto
>> is ready we can initialize the compression.
>>
>> Reported-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
>> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
>> ---
>> fs/pstore/platform.c | 13 +++++++++++++
>> fs/pstore/ram.c | 2 +-
>> 2 files changed, 14 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
>> index 15e99d5a681d..f09066db2d4d 100644
>> --- a/fs/pstore/platform.c
>> +++ b/fs/pstore/platform.c
>> @@ -780,6 +780,19 @@ void __init pstore_choose_compression(void)
>> }
>> }
>> +static int __init pstore_compression_late_init(void)
>> +{
>> + /*
>> + * Check if any pstore backends registered earlier but did not
>> allocate
>> + * for compression because crypto was not ready, if so then
>> initialize
>> + * compression.
>> + */
>> + if (psinfo && !tfm)
>> + allocate_buf_for_compression();
>> + return 0;
>> +}
>> +late_initcall(pstore_compression_late_init);
>> +
>> module_param(compress, charp, 0444);
>> MODULE_PARM_DESC(compress, "Pstore compression to use");
>> diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
>> index bbd1e357c23d..98e48d1a9776 100644
>> --- a/fs/pstore/ram.c
>> +++ b/fs/pstore/ram.c
>> @@ -940,7 +940,7 @@ static int __init ramoops_init(void)
>> ramoops_register_dummy();
>> return platform_driver_register(&ramoops_driver);
>> }
>> -late_initcall(ramoops_init);
>> +postcore_initcall(ramoops_init);
>> static void __exit ramoops_exit(void)
>> {
>>
>
> Yes I could see the early crash dump. Also I tested with different
> compression (LZO) instead of deflate just to be sure and it works fine,
> thanks :)
>
> Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
>
I just noticed that allocate_buf_for_compression() is also called from
pstore_register(). Shouldn't that call be removed now that ramoops_init
is moved to postcore_initcall and allocate_buf_for_compression() will
just return doing nothing when called from pstore_register()?
Thanks,
Sai
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
next prev parent reply other threads:[~2018-10-17 14:50 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-16 11:38 Crash in msm serial on dragonboard with ftrace bootargs Sai Prakash Ranjan
2018-10-16 11:44 ` Greg Kroah-Hartman
2018-10-16 11:58 ` Sai Prakash Ranjan
2018-10-16 15:29 ` Steven Rostedt
2018-10-16 16:35 ` Sai Prakash Ranjan
2018-10-16 16:57 ` Steven Rostedt
2018-10-16 17:36 ` Sai Prakash Ranjan
2018-10-16 17:48 ` Steven Rostedt
2018-10-16 18:05 ` Sai Prakash Ranjan
2018-10-16 18:16 ` Steven Rostedt
2018-10-16 18:25 ` Sai Prakash Ranjan
2018-10-16 18:41 ` Steven Rostedt
2018-10-16 19:01 ` Sai Prakash Ranjan
2018-10-16 19:03 ` Steven Rostedt
2018-10-16 19:06 ` Sai Prakash Ranjan
2018-10-16 19:15 ` Steven Rostedt
2018-10-16 19:16 ` Steven Rostedt
2018-10-16 19:37 ` Sai Prakash Ranjan
2018-10-16 19:35 ` Sai Prakash Ranjan
2018-10-16 20:51 ` Stephen Boyd
2018-10-17 11:27 ` Sai Prakash Ranjan
2018-10-18 2:33 ` Steven Rostedt
2018-10-18 5:21 ` Sai Prakash Ranjan
2018-10-18 13:17 ` Steven Rostedt
2018-10-19 4:17 ` Joel Fernandes
2018-10-19 6:54 ` Sai Prakash Ranjan
2018-10-19 13:51 ` Steven Rostedt
2018-10-19 14:48 ` Sai Prakash Ranjan
2018-10-19 15:12 ` Steven Rostedt
2018-10-25 14:36 ` saiprakash.ranjan
2018-11-13 9:44 ` Srinivas Kandagatla
2018-11-15 10:33 ` Sai Prakash Ranjan
2018-11-15 10:53 ` Srinivas Kandagatla
2018-11-16 3:39 ` Viresh Kumar
2018-11-16 10:49 ` Sai Prakash Ranjan
2018-10-16 17:02 ` Kees Cook
2018-10-17 10:13 ` Joel Fernandes
2018-10-17 11:38 ` Sai Prakash Ranjan
2018-10-17 14:49 ` Sai Prakash Ranjan [this message]
2018-10-17 17:56 ` Joel Fernandes
2018-10-17 18:25 ` Kees Cook
2018-10-16 23:09 ` Joel Fernandes
2018-10-17 11:53 ` Sai Prakash Ranjan
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