linux-kernel - Re: [RFC/PATCH] mm/futex: Fix futex writes on archs with SW tracking of dirty & young

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Message-ID: <1311757190.24752.406.camel@twins>
Date:	Wed, 27 Jul 2011 10:59:50 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Mike Frysinger <vapier.adi@...il.com>,
	Shan Hai <haishan.bai@...il.com>, paulus@...ba.org,
	tglx@...utronix.de, walken@...gle.com, dhowells@...hat.com,
	cmetcalf@...era.com, tony.luck@...el.com,
	akpm@...ux-foundation.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [RFC/PATCH] mm/futex: Fix futex writes on archs with SW
 tracking of dirty & young

On Wed, 2011-07-27 at 17:58 +1000, Benjamin Herrenschmidt wrote:

> What should nommu do anyways ? it's not like there's much it can do
> right ? It should never even hit the fault path to start with ...

Something like the below makes a nommu arm config build.. David, is this
indeed the correct thing to do for nommu?

---
Index: linux-2.6/mm/nommu.c
===================================================================
--- linux-2.6.orig/mm/nommu.c
+++ linux-2.6/mm/nommu.c
@@ -190,6 +190,12 @@ int get_user_pages(struct task_struct *t
 }
 EXPORT_SYMBOL(get_user_pages);
 
+int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
+		     unsigned long address, unsigned int fault_flags)
+{
+	BUG(); /* nommu should never call this */
+}
+
 /**
  * follow_pfn - look up PFN at a user virtual address
  * @vma: memory mapping

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