linux-kernel - Re: [PATCH v6 06/33] riscv/Kconfig: enable HAVE_EXIT

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Message-ID: <ZwZow-L3d_ZeONvq@finisterre.sirena.org.uk>
Date: Wed, 9 Oct 2024 12:28:03 +0100
From: Mark Brown <broonie@...nel.org>
To: Deepak Gupta <debug@...osinc.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
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Subject: Re: [PATCH v6 06/33] riscv/Kconfig: enable HAVE_EXIT_THREAD for riscv

On Tue, Oct 08, 2024 at 03:36:48PM -0700, Deepak Gupta wrote:

> riscv will need an implementation for exit_thread to clean up shadow stack
> when thread exits. If current thread had shadow stack enabled, shadow
> stack is allocated by default for any new thread.

FWIW both arm64 and x86 do this via deactivate_mm().  ISTR there's some
case where exit_thread() doesn't quite do the right thing but I can't
remember the specifics right now, possibly the vfork() case but ICBW?
In any case like Rick said factoring out the common patterns would be
good, keeping things aligned would support that.

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