linux-kernel - RE: [PATCH] flush icache before set_pte() on ia64 take9 [2/2] flush icache at set

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Date:	Fri, 10 Aug 2007 13:53:03 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"David Mosberger-Tang" <dmosberger@...il.com>
Cc:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	<linux-ia64@...r.kernel.org>,
	"LKML" <linux-kernel@...r.kernel.org>, <davem@...emloft.net>,
	<Zoltan.Menyhart@...l.net>, <nickpiggin@...oo.com.au>
Subject: RE: [PATCH] flush icache before set_pte() on ia64 take9 [2/2] flush icache at set_pte

> What about code-size?

   text    data     bss     dec     hex filename
9499911  911620 1313065 11724596         b2e734 vmlinux-before

   text    data     bss     dec     hex filename
9504047  911620 1313065 11728732         b2f75c vmlinux-after

So about 4K extra.  In the kernel I built (tiger_defconfig) there
are 27 call-sites for __ia64_sync_icache_dcache ... so that amounts
to about 150 bytes each ... or close to 10 bundles.

> Also, is it OK to call a function from all places where a set_pte() is
> being done?  I'd hope so, but it's a really low-level operation...

These are all from normal-looking C code ... so RSE must be valid.
What other weird things might be be doing that would make it a
problem for the new code to make a function call?

-Tony
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