linux-kernel - Re: [PATCH v3 2.6.39-rc1-tip 9/26] 9: uprobes: mmap and fork hooks.

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Message-ID: <1303143717.32491.872.camel@twins>
Date:	Mon, 18 Apr 2011 18:21:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>,
	Christoph Hellwig <hch@...radead.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	SystemTap <systemtap@...rces.redhat.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v3 2.6.39-rc1-tip 9/26]  9: uprobes: mmap and fork
 hooks.

On Fri, 2011-04-01 at 20:04 +0530, Srikar Dronamraju wrote:
> +       if (vma) {
> +               /*
> +                * We get here from uprobe_mmap() -- the case where we
> +                * are trying to copy an instruction from a page that's
> +                * not yet in page cache.
> +                *
> +                * Read page in before copy.
> +                */
> +               struct file *filp = vma->vm_file;
> +
> +               if (!filp)
> +                       return -EINVAL;
> +               page_cache_sync_readahead(mapping, &filp->f_ra, filp, idx, 1);
> +       }
> +       page = grab_cache_page(mapping, idx); 

So I don't see why that isn't so for the normal install_uprobe() <-
register_uprobe() path.
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