linux-kernel - Re: [PATCH 1/3] samples/hw_breakpoint: Drop HW_BREAKPOINT

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Message-ID: <20200221141228.GB6968@lst.de>
Date:   Fri, 21 Feb 2020 15:12:28 +0100
From:   Christoph Hellwig <hch@....de>
To:     Will Deacon <will@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        akpm@...ux-foundation.org,
        "K . Prasad" <prasad@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Quentin Perret <qperret@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH 1/3] samples/hw_breakpoint: Drop HW_BREAKPOINT_R when
 reporting writes

On Fri, Feb 21, 2020 at 11:44:02AM +0000, Will Deacon wrote:
> Given the name of a kernel symbol, the 'data_breakpoint' test claims to
> "report any write operations on the kernel symbol". However, it creates
> the breakpoint using both HW_BREAKPOINT_W and HW_BREAKPOINT_R, which
> menas it also fires for read access.
> 
> Drop HW_BREAKPOINT_R from the breakpoint attributes.

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>