linux-kernel - Re: [PATCH v34 10/24] mm: Add vm

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Date:   Wed, 8 Jul 2020 15:37:08 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        x86@...nel.org, linux-sgx@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jethro Beekman <jethro@...tanix.com>,
        andriy.shevchenko@...ux.intel.com, asapek@...gle.com, bp@...en8.de,
        cedric.xing@...el.com, chenalexchen@...gle.com,
        conradparker@...gle.com, cyhanish@...gle.com,
        dave.hansen@...el.com, haitao.huang@...el.com,
        josh@...htriplett.org, kai.huang@...el.com, kai.svahn@...el.com,
        kmoy@...gle.com, ludloff@...gle.com, luto@...nel.org,
        nhorman@...hat.com, npmccallum@...hat.com, puiterwijk@...hat.com,
        rientjes@...gle.com, tglx@...utronix.de, yaozhangx@...gle.com
Subject: Re: [PATCH v34 10/24] mm: Add vm_ops->mprotect()

On Wed, Jul 08, 2020 at 05:33:20PM +0300, Jarkko Sakkinen wrote:
> I get the point but I don't think that your proposal could work given
> that mprotect-callback takes neither 'prev' nor 'newflags' as its
> parameters. The current callback has no means to call mprotect_fixup()
> properly.
> 
> It would have to be extended
> 
> 	int (*mprotect)(struct vm_area_struct *vma,
> 			struct vm_area_struct **pprev, unsigned long start,
> 			unsigned long end, unsigned long prot,
> 			unsigned long newflags);
> 
> Is this what you want?

https://lore.kernel.org/linux-mm/20200625173050.GF7703@casper.infradead.org/