linux-kernel - Re: [PATCHv2 11/19] arm64: don't reload GPRs after apply

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Message-ID: <57f6f0ca-8256-d642-fd59-034b989dc5c8@arm.com>
Date:   Fri, 1 Jun 2018 15:41:30 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        will.deacon@....com, catalin.marinas@....com
Subject: Re: [PATCHv2 11/19] arm64: don't reload GPRs after apply_ssbd

On 01/06/18 12:24, Mark Rutland wrote:
> Now that all of the syscall logic works on the saved pt_regs, apply_ssbd
> can safely corrupt x0-x3 in the entry paths, and we no longer need to
> restore them. So let's remotve the logic doing so.

remove*

> 
> With that logic gone, we can fold the branch target into the macro, so
> that callers need not deal with this. GAS provides \@, which provides a
> unique value per macro invocation, which we can use to create a unique
> label.
> 
> Signed-off-by: Mark Rutland <mark.rutland@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Marc Zyngier <marc.zyngier@....com>
> Cc: Will Deacon <will.deacon@....com>

Acked-by: Marc Zyngier <marc.zyngier@....com>

	M.
-- 
Jazz is not dead. It just smells funny...