linux-kernel - Re: [PATCH v5 3/7] powerpc: use task_pid

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Message-Id: <65f643c0-6ac0-a88f-6822-c95d17c83a9f@au1.ibm.com>
Date:   Thu, 31 May 2018 14:29:57 +1000
From:   Andrew Donnellan <andrew.donnellan@....ibm.com>
To:     "Alastair D'Silva" <alastair@....ibm.com>,
        linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        mikey@...ling.org, vaibhav@...ux.vnet.ibm.com,
        aneesh.kumar@...ux.vnet.ibm.com, malat@...ian.org,
        felix@...ux.vnet.ibm.com, pombredanne@...b.com,
        sukadev@...ux.vnet.ibm.com, npiggin@...il.com,
        gregkh@...uxfoundation.org, arnd@...db.de,
        fbarrat@...ux.vnet.ibm.com, corbet@....net,
        "Alastair D'Silva" <alastair@...ilva.org>
Subject: Re: [PATCH v5 3/7] powerpc: use task_pid_nr() for TID allocation

On 11/05/18 16:12, Alastair D'Silva wrote:
> From: Alastair D'Silva <alastair@...ilva.org>
> 
> The current implementation of TID allocation, using a global IDR, may
> result in an errant process starving the system of available TIDs.
> Instead, use task_pid_nr(), as mentioned by the original author. The
> scenario described which prevented it's use is not applicable, as
> set_thread_tidr can only be called after the task struct has been
> populated.
> 
> In the unlikely event that 2 threads share the TID and are waiting,
> all potential outcomes have been determined safe.
> 
> Signed-off-by: Alastair D'Silva <alastair@...ilva.org>

Thanks for the clarifying comment. The diff is painful to read but I 
think it makes sense :)

Reviewed-by: Andrew Donnellan <andrew.donnellan@....ibm.com>

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