linux-kernel - Re: [RFC V2] arm64:use set_fixmap

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Message-ID: <20150728084740.GC29209@arm.com>
Date:	Tue, 28 Jul 2015 09:47:40 +0100
From:	Will Deacon <will.deacon@....com>
To:	yalin wang <yalin.wang2010@...il.com>
Cc:	Catalin Marinas <Catalin.Marinas@....com>,
	"zlim.lnx@...il.com" <zlim.lnx@...il.com>,
	Punit Agrawal <Punit.Agrawal@....com>,
	Marc Zyngier <Marc.Zyngier@....com>,
	"lauraa@...eaurora.org" <lauraa@...eaurora.org>,
	"wcohen@...hat.com" <wcohen@...hat.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC V2] arm64:use set_fixmap_offset to make it more clear

On Tue, Jul 28, 2015 at 07:31:20AM +0100, yalin wang wrote:
> 
> > On Jul 24, 2015, at 19:52, yalin wang <yalin.wang2010@...il.com> wrote:
> > 
> > A little change to patch_map() function,
> > use set_fixmap_offset() to make code more clear.
> > 
> > Signed-off-by: yalin wang <yalin.wang2010@...il.com>
> > ---
> > arch/arm64/kernel/insn.c | 5 ++---
> > 1 file changed, 2 insertions(+), 3 deletions(-)
> > 
> > diff --git a/arch/arm64/kernel/insn.c b/arch/arm64/kernel/insn.c
> > index dd9671c..f341866 100644
> > --- a/arch/arm64/kernel/insn.c
> > +++ b/arch/arm64/kernel/insn.c
> > @@ -101,9 +101,8 @@ static void __kprobes *patch_map(void *addr, int fixmap)
> > 		return addr;
> > 
> > 	BUG_ON(!page);
> > -	set_fixmap(fixmap, page_to_phys(page));
> > -
> > -	return (void *) (__fix_to_virt(fixmap) + (uintaddr & ~PAGE_MASK));
> > +	return (void *)set_fixmap_offset(fixmap, page_to_phys(page) +
> > +			(uintaddr & ~PAGE_MASK));
> > }
> > 
> > static void __kprobes patch_unmap(int fixmap)
> > -- 
> > 1.9.1
> > 
> Marinas,
> this V2 patch can build without warning even CONFIG_DEBUG_SET_MODULE_RONX enabled,
> could you review it.
> Thanks.

I queued this already for 4.3. There's a (benign) sparse warning about the
addr parameter to patch_map being overridden by the local scope of
set_fixmap_offset which could be solved with a healthy portion of
underscores in the core code.

Will
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