linux-kernel - Re: [PATCH v5 0/5] mm: introduce memfd_secret system call to create "secret" memory areas

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Message-ID: <20200921180748.4f88028d@canb.auug.org.au>
Date:   Mon, 21 Sep 2020 18:07:48 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Qian Cai <cai@...hat.com>
Cc:     Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christopher Lameter <cl@...ux.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Hildenbrand <david@...hat.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>, Idan Yaniv <idan.yaniv@....com>,
        Ingo Molnar <mingo@...hat.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Matthew Wilcox <willy@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tycho Andersen <tycho@...ho.ws>, Will Deacon <will@...nel.org>,
        linux-api@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-riscv@...ts.infradead.org, x86@...nel.org,
        linux-next@...r.kernel.org
Subject: Re: [PATCH v5 0/5] mm: introduce memfd_secret system call to create
 "secret" memory areas

Hi all,

On Fri, 18 Sep 2020 14:25:15 -0400 Qian Cai <cai@...hat.com> wrote:
>
> On Thu, 2020-09-17 at 09:27 -0400, Qian Cai wrote:
> > On Wed, 2020-09-16 at 10:35 +0300, Mike Rapoport wrote:  
> > > From: Mike Rapoport <rppt@...ux.ibm.com>
> > > 
> > > This is an implementation of "secret" mappings backed by a file descriptor. 
> > > I've dropped the boot time reservation patch for now as it is not strictly
> > > required for the basic usage and can be easily added later either with or
> > > without CMA.  
> > 
> > On powerpc: https://gitlab.com/cailca/linux-mm/-/blob/master/powerpc.config
> > 
> > There is a compiling warning from the today's linux-next:
> > 
> > <stdin>:1532:2: warning: #warning syscall memfd_secret not implemented [-Wcpp]  
> 
> This should silence the warning:
> 
> diff --git a/scripts/checksyscalls.sh b/scripts/checksyscalls.sh
> index a18b47695f55..b7609958ee36 100755
> --- a/scripts/checksyscalls.sh
> +++ b/scripts/checksyscalls.sh
> @@ -40,6 +40,10 @@ cat << EOF
>  #define __IGNORE_setrlimit	/* setrlimit */
>  #endif
>  
> +#ifndef __ARCH_WANT_MEMFD_SECRET
> +#define __IGNORE_memfd_secret
> +#endif
> +
>  /* Missing flags argument */
>  #define __IGNORE_renameat	/* renameat2 */
> 

Added to linux-next today.

-- 
Cheers,
Stephen Rothwell

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