linux-kernel - Re: [PATCH 2/3] alloc_tag: prevent enabling memory profiling if it was shut down

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Message-ID: <k6dhapofhcrhmcigqasy25lxmht4ybxp7jv5rg5oe4fjt3feop@lkyiqad43b5b>
Date: Tue, 9 Sep 2025 22:32:15 -0700
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: akpm@...ux-foundation.org, kent.overstreet@...ux.dev, vbabka@...e.cz, 
	mhocko@...e.com, jackmanb@...gle.com, hannes@...xchg.org, ziy@...dia.com, 
	usamaarif642@...il.com, 00107082@....com, pasha.tatashin@...een.com, 
	souravpanda@...gle.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] alloc_tag: prevent enabling memory profiling if it
 was shut down

On Tue, Sep 09, 2025 at 04:34:08PM -0700, Suren Baghdasaryan wrote:
> Memory profiling can be shut down due to reasons like a failure during
> initialization. When this happens, the user should not be able to
> re-enable it. Current sysctrl interface does not handle this properly
> and will allow re-enabling memory profiling. Fix this by checking for
> this condition during sysctrl write operation.
> 
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>

Acked-by: Shakeel Butt <shakeel.butt@...ux.dev>