linux-kernel - Re: [PATCH v2 1/2] mm/page_reporting: Add checks for page_reporting

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Date:   Thu, 27 Oct 2022 13:22:07 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Wei Liu <wei.liu@...nel.org>
Cc:     Shradha Gupta <shradhagupta@...ux.microsoft.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>,
        Michael Kelley <mikelley@...rosoft.com>
Subject: Re: [PATCH v2 1/2] mm/page_reporting: Add checks for
 page_reporting_order param

On Wed, 26 Oct 2022 15:33:47 +0000 Wei Liu <wei.liu@...nel.org> wrote:

> On Thu, Sep 29, 2022 at 11:01:38PM -0700, Shradha Gupta wrote:
> > Current code allows the page_reporting_order parameter to be changed
> > via sysfs to any integer value.  The new value is used immediately
> > in page reporting code with no validation, which could cause incorrect
> > behavior.  Fix this by adding validation of the new value.
> > Export this parameter for use in the driver that is calling the
> > page_reporting_register().
> > This is needed by drivers like hv_balloon to know the order of the
> > pages reported. Traditionally the values provided in the kernel boot
> > line or subsequently changed via sysfs take priority therefore, if
> > page_reporting_order parameter's value is set, it takes precedence
> > over the value passed while registering with the driver.
> > 
> > Signed-off-by: Shradha Gupta <shradhagupta@...ux.microsoft.com>
> 
> Andrew and other MM reviewers, can I get an ack / nack for this patch?

Looks OK to me.  Can this be merged via the hyperv tree?