linux-kernel - Re: [PATCH 0/5] kmap cleanups for uretprobes (Was: extract fill

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Date:	Mon, 25 Mar 2013 11:30:24 +0100
From:	Anton Arapov <anton@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Josh Stone <jistone@...hat.com>,
	Frank Eigler <fche@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	adrian.m.negreanu@...el.com, Torsten.Polle@....de
Subject: Re: [PATCH 0/5] kmap cleanups for uretprobes (Was: extract
 fill_page() and trampoline implementation)

On Sun, Mar 24, 2013 at 07:20:40PM +0100, Oleg Nesterov wrote:
> On 03/24, Oleg Nesterov wrote:
> >
> > On 03/22, Anton Arapov wrote:
> > >
> > > +static void fill_page(struct page *page, unsigned long offset, uprobe_opcode_t *insn)
> >                                                                   ^^^^^^^^^^^^^^^
> > Well, it should be "u8 *insn" or "char *".
> 
> Or void*.
> 
> And we have another reason for this helper.
> 
> And I really think that we need to cleanup the kmap mess in uprobe.c
> before we add the new abuser.
> 
> How about this simple series?
> 
> > sizeof(insn) == UPROBE_SWBP_INSN_SIZE != MAX_UINSN_BYTES. See also the
> > comments above.
> 
> I think that copy_to_page() added by 4/5 is what you need, and it solves
> the problems with typeof/sizeof. Plus it have another caller.

That's what I can't come up with. My fill_page() was indeed ugly. 

Thanks!
Anton.

> Oleg.
> 
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