linux-kernel - Re: [PATCH 01/10] staging: erofs: fix `trace_erofs

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Message-ID: <fcf5c088-6025-171f-bc24-0e698c68bbb7@huawei.com>
Date:   Thu, 22 Nov 2018 18:49:53 +0800
From:   Gao Xiang <gaoxiang25@...wei.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     <devel@...verdev.osuosl.org>, <linux-erofs@...ts.ozlabs.org>,
        Chao Yu <yuchao0@...wei.com>,
        LKML <linux-kernel@...r.kernel.org>, <weidu.du@...wei.com>,
        Miao Xie <miaoxie@...wei.com>
Subject: Re: [PATCH 01/10] staging: erofs: fix `trace_erofs_readpage' position

Hi Greg,

On 2018/11/22 18:19, Greg Kroah-Hartman wrote:
> On Tue, Nov 20, 2018 at 10:34:16PM +0800, Gao Xiang wrote:
>> `trace_erofs_readpage' should be placed in .readpage()
>> rather than in the internal `z_erofs_do_read_page'.
> Why?  What happens with the code today?
trace_erofs_readpage is used to trace .readpage() interface (it represents sync read)
hook rather than its internal implementation z_erofs_do_read_page (which both .readpage()
and .readpages() uses it). Chen Gong places the tracepoint to a wrong place by mistake.
And we found it by our internal test using this tracepoint.

> 
>> Fixes: 284db12cfda3 ("staging: erofs: add trace points for reading zipped data")
> Should this get into 4.20-final?
I think so, which is not very important but I think it should be fixed...

Thanks,
Gao Xiang

> 
> thanks,
> 
> greg k-h