linux-kernel - Re: [PATCH v3 00/11] Introduces new count-based method for monitoring lockless pagetable walks

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Message-ID: <ed1a954a67de3b1fa66e921883153622f3446813.camel@linux.ibm.com>
Date:   Fri, 27 Sep 2019 20:25:15 -0300
From:   Leonardo Bras <leonardo@...ux.ibm.com>
To:     jhubbard@...dia.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, kvm-ppc@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org
Cc:     benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        arnd@...db.de, aneesh.kumar@...ux.ibm.com, christophe.leroy@....fr,
        akpm@...ux-foundation.org, dan.j.williams@...el.com,
        npiggin@...il.com, mahesh@...ux.vnet.ibm.com,
        gregkh@...uxfoundation.org, tglx@...utronix.de,
        ganeshgr@...ux.ibm.com, allison@...utok.net, rppt@...ux.ibm.com,
        yuehaibing@...wei.com, ira.weiny@...el.com, jgg@...pe.ca,
        keith.busch@...el.com
Subject: Re: [PATCH v3 00/11] Introduces new count-based method for
 monitoring lockless pagetable walks

On Fri, 2019-09-27 at 11:46 -0300, Leonardo Bras wrote:
> I am not sure if it would be ok to use irq_{save,restore} in real mode,
> I will do some more reading of the docs before addressing this. 

It looks like it's unsafe to merge irq_{save,restore} in
{start,end}_lockless_pgtbl_walk(), due to a possible access of code
that is not accessible in real mode.

I am sending a v4 for the changes so far.
I will look forward for your feedback.

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