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Date: Tue, 5 Feb 2019 14:25:07 +0100
From: Peter Zijlstra <>
To: Borislav Petkov <>
Cc: Rick Edgecombe <>,
	Andy Lutomirski <>, Ingo Molnar <>,,,,
	Thomas Gleixner <>,
	Nadav Amit <>,
	Dave Hansen <>,,,,,,,,,,,
	Nadav Amit <>, Kees Cook <>,
	Dave Hansen <>,
	Masami Hiramatsu <>
Subject: Re: [PATCH v2 06/20] x86/alternative: use temporary mm for text

On Tue, Feb 05, 2019 at 01:35:33PM +0100, Borislav Petkov wrote:
> On Tue, Feb 05, 2019 at 12:31:46PM +0100, Peter Zijlstra wrote:
> > ...
> >
> > So while in general I agree with BUG_ON() being undesirable, I think
> > liberal sprinking in text_poke() is fine; you really _REALLY_ want this
> > to work or fail loudly. Text corruption is just painful.
> Ok. It would be good to have the gist of this sentiment in a comment
> above it so that it is absolutely clear why we're doing it.
> And since text_poke() can't fail, then it doesn't need a retval too.
> AFAICT, nothing is actually using it.

See patch 12, that removes the return value (after fixing the few users
that currently 'rely' on it).

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