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

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Message-ID: <20130324182040.GA13078@redhat.com>
Date:	Sun, 24 Mar 2013 19:20:40 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Anton Arapov <anton@...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: [PATCH 0/5] kmap cleanups for uretprobes (Was: extract fill_page()
	and trampoline implementation)

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.

Oleg.

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