linux-kernel - RE: [PATCH] ia64: race flushing icache in COW path

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Message-ID: <617E1C2C70743745A92448908E030B2A3CC204@scsmsx411.amr.corp.intel.com>
Date:	Fri, 14 Jul 2006 10:11:53 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
Cc:	"Jason Baron" <jbaron@...hat.com>, <torvalds@...l.org>,
	<akpm@...l.org>, <linux-ia64@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: RE: [PATCH] ia64: race flushing icache in COW path

@@ -1980,6 +1980,7 @@ static int do_swap_page(struct mm_struct
 	}
 
 	flush_icache_page(vma, page);
+	lazy_mmu_prot_update(pte);
 	set_pte_at(mm, address, page_table, pte);
 	page_add_anon_rmap(page, vma, address);
 

At first sight, this looks redundant ... but then I saw that
on ia64 "flush_icache_page()" is actually a no-op.  Perhaps
we can enter this in the next obfuscated C competition.

-Tony
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