linux-kernel - Re: [PATCH v6 0/2] mm/memblock: Add "reserve_mem" to reserved named memory at boot up

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Message-ID: <ZnKQp_qd9oImOpUe@kernel.org>
Date: Wed, 19 Jun 2024 11:02:47 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Ard Biesheuvel <ardb@...nel.org>
Cc: Alexander Graf <graf@...zon.com>, Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vincent Donnefort <vdonnefort@...gle.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>, suleiman@...gle.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Vineeth Pillai <vineeth@...byteword.org>,
	Youssef Esmat <youssefesmat@...gle.com>,
	Beau Belgrave <beaub@...ux.microsoft.com>,
	Baoquan He <bhe@...hat.com>, Borislav Petkov <bp@...en8.de>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH v6 0/2] mm/memblock: Add "reserve_mem" to reserved named
 memory at boot up

On Tue, Jun 18, 2024 at 12:21:19PM +0200, Ard Biesheuvel wrote:
> On Mon, 17 Jun 2024 at 23:01, Alexander Graf <graf@...zon.com> wrote:
>
> So I would personally prefer for this code not to go in at all. But if
> it does go in (and Steven has already agreed to this), it needs a
> giant disclaimer that it is best effort and may get broken
> inadvertently by changes that may seem unrelated.

I think that reserve_mem= is way less intrusive than memmap= we anyway
have.
It will reserve memory and the documentation adequately warns that the
location of that memory might be at different physical addresses.

-- 
Sincerely yours,
Mike.