linux-kernel - Re: [PATCH 1/3] powerpc: Emulation support for load/store instructions on LE

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Message-Id: <e993dc5c-7a90-e43b-b761-a70a79b3d1d9@au1.ibm.com>
Date:   Fri, 4 Nov 2016 13:07:15 +1100
From:   Andrew Donnellan <andrew.donnellan@....ibm.com>
To:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     chris@...troguy.com, aneesh.kumar@...ux.vnet.ibm.com,
        ast@...nel.org, linux-kernel@...r.kernel.org, oss@...error.net,
        paul.gortmaker@...driver.com, duwe@....de,
        Anton Blanchard <anton@...ba.org>,
        lsorense@...lub.uwaterloo.ca, bauerman@...ux.vnet.ibm.com,
        oohall@...il.com, naveen.n.rao@...ux.vnet.ibm.com,
        linuxppc-dev@...ts.ozlabs.org, paulus@...ba.org,
        viro@...iv.linux.org.uk
Subject: Re: [PATCH 1/3] powerpc: Emulation support for load/store
 instructions on LE

On 03/11/16 21:27, Ravi Bangoria wrote:
> Yes, kernel-space hw-breakpoint feature is broken on LE without this.

Is there any actual user-visible feature that depends on this, or is 
this solely for debugging and development purposes?

It would of course be *nice* to have it in stable trees (particularly so 
we pick it up in distros) but I'm not convinced that enabling HW 
breakpoints on a platform where it has *never* worked qualifies as an 
"actual bug".

(BTW many thanks for fixing this - I had a shot at it late last year but 
never quite got there!)

-- 
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan@....ibm.com  IBM Australia Limited