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

[Stephen Rothwell]

Hi all,

On Fri, 18 Sep 2020 14:25:15 -0400 Qian Cai <cai@xxxxxxxxxx> 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@xxxxxxxxxxxxx>
> > > 
> > > 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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