From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Wed, 23 Sep 2020 14:22:54 +0100 From: Al Viro Subject: Re: [PATCH 1/9] kernel: add a PF_FORCE_COMPAT flag Message-ID: <20200923132254.GI3421308@ZenIV.linux.org.uk> References: <563138b5-7073-74bc-f0c5-b2bad6277e87@gmail.com> <486c92d0-0f2e-bd61-1ab8-302524af5e08@gmail.com> <91209170-dcb4-d9ee-afa0-a819f8877b86@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <91209170-dcb4-d9ee-afa0-a819f8877b86@gmail.com> Sender: Al Viro List-ID: To: Pavel Begunkov Cc: Arnd Bergmann , Andy Lutomirski , Christoph Hellwig , Andrew Morton , Jens Axboe , David Howells , linux-arm-kernel , X86 ML , LKML , "open list:MIPS" , Parisc List , linuxppc-dev , linux-s390 , sparclinux , linux-block , Linux SCSI List , Linux FS Devel , linux-aio , io-uring@vger.kernel.org, linux-arch , Linux-MM , Network Development , keyrings@vger.kernel.org, LSM List On Wed, Sep 23, 2020 at 11:01:34AM +0300, Pavel Begunkov wrote: > > I'm not following why that would be considered a valid option, > > as that clearly breaks existing users that update from a 32-bit > > kernel to a 64-bit one. > > Do you mean users who move 32-bit binaries (without recompiling) to a > new x64 kernel? Does the kernel guarantees that to work? Yes. No further (printable) comments for now...