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Date: Tue, 26 Feb 2019 12:25:21 +0100 From: Peter Zijlstra <peterz@...radead.org> To: "Paul E. McKenney" <paulmck@...ux.ibm.com> Cc: Andrea Parri <andrea.parri@...rulasolutions.com>, linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org, Alan Stern <stern@...land.harvard.edu>, Will Deacon <will.deacon@....com>, Boqun Feng <boqun.feng@...il.com>, Nicholas Piggin <npiggin@...il.com>, David Howells <dhowells@...hat.com>, Jade Alglave <j.alglave@....ac.uk>, Luc Maranget <luc.maranget@...ia.fr>, Akira Yokosawa <akiyks@...il.com>, Daniel Lustig <dlustig@...dia.com> Subject: Re: [RFC PATCH] tools/memory-model: Remove (dep ; rfi) from ppo On Tue, Feb 26, 2019 at 12:21:33PM +0100, Peter Zijlstra wrote: > Also; we need to find a GCC person to find/give us a knob to kill this > entire class of nonsense. This is just horrible broken shit: > > > ~/tmp# gcc -O2 -fno-strict-aliasing -o ptr ptr.c ; ./ptr > p=0x5635dd3d5034 q=0x5635dd3d5034 > x=1 y=2 *p=11 *q=2 > ~/tmp# cat ptr.c > #include <stdio.h> > #include <string.h> > int y = 2, x = 1; > int main (int argc, char **argv) { > int *p = &x + argc; damn; wrong version; that should've been: s/argc/1/ same result though. > int *q = &y; > printf("p=%p q=%p\n", p, q); > if (!memcmp(&p, &q, sizeof(p))) { > *p = 11; > printf("x=%d y=%d *p=%d *q=%d\n", x, y, *p, *q); > } > }
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