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Date: Tue, 7 Nov 2017 14:16:58 +0300 From: "Kirill A. Shutemov" <kirill@...temov.name> To: Florian Weimer <fweimer@...hat.com> Cc: Nicholas Piggin <npiggin@...il.com>, "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, linuxppc-dev@...ts.ozlabs.org, linux-mm <linux-mm@...ck.org>, Andrew Morton <akpm@...ux-foundation.org>, Andy Lutomirski <luto@...capital.net>, Dave Hansen <dave.hansen@...el.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, linux-arch@...r.kernel.org, Ingo Molnar <mingo@...nel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: POWER: Unexpected fault when writing to brk-allocated memory On Tue, Nov 07, 2017 at 09:15:21AM +0100, Florian Weimer wrote: > MAP_FIXED is near-impossible to use correctly. I hope you don't expect > applications to do that. If you want address-based opt in, it should work > without MAP_FIXED. Sure, in obscure cases, applications might still see > out-of-range addresses, but I expected a full opt-out based on RLIMIT_AS > would be sufficient for them. Just use mmap(-1), without MAP_FIXED to get full address space. -- Kirill A. Shutemov
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