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From: Mike Rapoport <rppt@linux.ibm.com>
To: Qian Cai <qcai@redhat.com>
Cc: Mike Rapoport <rppt@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Andy Lutomirski <luto@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	Borislav Petkov <bp@alien8.de>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Christopher Lameter <cl@linux.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	David Hildenbrand <david@redhat.com>,
	Elena Reshetova <elena.reshetova@intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
	James Bottomley <jejb@linux.ibm.com>,
	"Kirill A. Shutemov" <kirill@shutemov.name>,
	Matthew Wilcox <willy@infradead.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Michael Kerrisk <mtk.manpages@gmail.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Rick Edgecombe <rick.p.edgecombe@intel.com>,
	Roman Gushchin <guro@fb.com>, Shakeel Butt <shakeelb@google.com>,
	Shuah Khan <shuah@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Tycho Andersen <tycho@tycho.ws>, Will Deacon <will@kernel.org>,
	linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
	linux-nvdimm@lists.01.org, linux-riscv@lists.infradead.org,
	x86@kernel.org, Palmer Dabbelt <palmerdabbelt@google.com>
Subject: Re: [PATCH v14 09/10] arch, mm: wire up memfd_secret system call were relevant
Date: Mon, 7 Dec 2020 18:00:06 +0200	[thread overview]
Message-ID: <20201207160006.GG1112728@linux.ibm.com> (raw)
In-Reply-To: <81631d3391abca3f41f2e19092b97a61d49f4e44.camel@redhat.com>

On Mon, Dec 07, 2020 at 09:45:59AM -0500, Qian Cai wrote:
> On Thu, 2020-12-03 at 08:29 +0200, Mike Rapoport wrote:

...

> > diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> > index 6d55324363ab..f9d93fbf9b69 100644
> > --- a/include/linux/syscalls.h
> > +++ b/include/linux/syscalls.h
> > @@ -1010,6 +1010,7 @@ asmlinkage long sys_pidfd_send_signal(int pidfd, int sig,
> >  asmlinkage long sys_pidfd_getfd(int pidfd, int fd, unsigned int flags);
> >  asmlinkage long sys_watch_mount(int dfd, const char __user *path,
> >  				unsigned int at_flags, int watch_fd, int watch_id);
> > +asmlinkage long sys_memfd_secret(unsigned long flags);
> >  
> >  /*
> >   * Architecture-specific system calls
> > diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
> > index 5df46517260e..51151888f330 100644
> > --- a/include/uapi/asm-generic/unistd.h
> > +++ b/include/uapi/asm-generic/unistd.h
> > @@ -861,9 +861,13 @@ __SYSCALL(__NR_faccessat2, sys_faccessat2)
> >  __SYSCALL(__NR_process_madvise, sys_process_madvise)
> >  #define __NR_watch_mount 441
> >  __SYSCALL(__NR_watch_mount, sys_watch_mount)
> > +#ifdef __ARCH_WANT_MEMFD_SECRET
> > +#define __NR_memfd_secret 442
> > +__SYSCALL(__NR_memfd_secret, sys_memfd_secret)
> > +#endif
> 
> I can't see where was it defined for arm64 after it looks like Andrew has
> deleted the  above chunk. Thus, we have a warning using this .config:
> 
> https://cailca.coding.net/public/linux/mm/git/files/master/arm64.config
> 
> <stdin>:1539:2: warning: #warning syscall memfd_secret not implemented [-Wcpp]

I was under the impression that Andrew only removed the #ifdef...

Andrew, can you please restore syscall definition for memfd_secret() in
include/uapi/asm-generic/unistd.h?

> >  
> >  #undef __NR_syscalls
> > -#define __NR_syscalls 442
> > +#define __NR_syscalls 443
> >  
> >  /*
> >   * 32 bit systems traditionally used different
> > diff --git a/mm/secretmem.c b/mm/secretmem.c
> > index 7236f4d9458a..b8a32954ac68 100644
> > --- a/mm/secretmem.c
> > +++ b/mm/secretmem.c
> > @@ -415,6 +415,9 @@ static int __init secretmem_setup(char *str)
> >  	unsigned long reserved_size;
> >  	int err;
> >  
> > +	if (!can_set_direct_map())
> > +		return 0;
> > +
> >  	reserved_size = memparse(str, NULL);
> >  	if (!reserved_size)
> >  		return 0;
> > 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 */
> >  
> 

-- 
Sincerely yours,
Mike.

  reply	other threads:[~2020-12-07 16:01 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-03  6:29 [PATCH v14 00/10] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2020-12-03  6:29 ` [PATCH v14 01/10] mm: add definition of PMD_PAGE_ORDER Mike Rapoport
2020-12-03  6:29 ` [PATCH v14 02/10] mmap: make mlock_future_check() global Mike Rapoport
2020-12-03  6:29 ` [PATCH v14 03/10] set_memory: allow set_direct_map_*_noflush() for multiple pages Mike Rapoport
2020-12-03  6:29 ` [PATCH v14 04/10] set_memory: allow querying whether set_direct_map_*() is actually enabled Mike Rapoport
2020-12-03 23:36   ` Andrew Morton
2020-12-06 11:28     ` Mike Rapoport
2020-12-03  6:29 ` [PATCH v14 05/10] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2021-01-19 20:22   ` Matthew Wilcox
2021-01-20 15:05     ` Mike Rapoport
2021-01-20 16:02       ` Matthew Wilcox
2021-01-20 17:04         ` Mike Rapoport
2020-12-03  6:29 ` [PATCH v14 06/10] secretmem: use PMD-size pages to amortize direct map fragmentation Mike Rapoport
2020-12-03  6:29 ` [PATCH v14 07/10] secretmem: add memcg accounting Mike Rapoport
2020-12-03 15:47   ` Shakeel Butt
2020-12-03  6:29 ` [PATCH v14 08/10] PM: hibernate: disable when there are active secretmem users Mike Rapoport
2020-12-03  6:29 ` [PATCH v14 09/10] arch, mm: wire up memfd_secret system call were relevant Mike Rapoport
2020-12-03 23:39   ` Andrew Morton
2020-12-06 11:30     ` Mike Rapoport
2020-12-07 14:45   ` Qian Cai
2020-12-07 16:00     ` Mike Rapoport [this message]
2020-12-08  1:34       ` Andrew Morton
2020-12-03  6:29 ` [PATCH v14 10/10] secretmem: test: add basic selftest for memfd_secret(2) Mike Rapoport
2020-12-12  6:16   ` John Hubbard
2020-12-12 13:59     ` Mike Rapoport

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