linux-kernel - Re: [PATCH V2] mips/vdso: Support mremap() for vDSO

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Message-ID: <5e1f610b.1c69fb81.f82c3.5b13@mx.google.com>
Date:   Wed, 15 Jan 2020 10:59:22 -0800
From:   Paul Burton <paulburton@...nel.org>
To:     Guoyun Sun <sunguoyun@...ngson.cn>
CC:     linux-mips@...r.kernel.org
Subject: Re: [PATCH V2] mips/vdso: Support mremap() for vDSO

Hello,

Guoyun Sun wrote:
> vDSO VMA address is saved in mm_context for the purpose of using
> restorer from vDSO page to return to userspace after signal handling.
> 
> In Checkpoint Restore in Userspace (CRIU) project we place vDSO VMA
> on restore back to the place where it was on the dump.
> 
> Make vDSO code track the VMA address by supplying .mremap() fops
> the same way it's done for x86 and arm by:
> commit b059a453b1cf ("x86/vdso: Add mremap hook to vm_special_mapping")
> commit 739586951b8a ("arm64/vdso: Support mremap() for vDSO").

Applied to mips-next.

> commit ad1df95419cc
> https://git.kernel.org/mips/c/ad1df95419cc
> 
> Signed-off-by: Guoyun Sun <sunguoyun@...ngson.cn>
> Signed-off-by: Paul Burton <paulburton@...nel.org>

Thanks,
    Paul

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