Re: [PATCH 2.6.24-rc3] Fix /proc/net breakage

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On Thu, Dec 27, 2007 at 11:17:28PM +0100, Andreas Mohr wrote:
> Hi,
> 
> On Thu, Dec 27, 2007 at 09:41:45PM +0300, Alexey Dobriyan wrote:
> > On Thu, Dec 27, 2007 at 06:40:56PM +0100, Andreas Mohr wrote:
> > > On Fri, Dec 07, 2007 at 02:23:42AM -0800, Andrew Morton wrote:
> > > > > (commit 2b1e300a9dfc3196ccddf6f1d74b91b7af55e416)
> > > > > 
> > > > > This seems to have broken the use of /proc/bus/usb as a mountpoint. It
> > > > > always appears empty now, whatever's supposed to be mounted there.
> > > > > 
> > > > 
> > > > Yes.  Denis and Eric are tossing around competing patches but afaik nobody
> > > > is happy with any of them.  Guys, could we get this sorted soonish please?
> > > 
> > > "Soonish" being rather earlier than 20071227?
> > > 'cause it's still throwing a fit for me on 2.6.24-rc6-mm1(!) (plus hotfix),
> > > nothing visible in /proc/bus/usb, thus WLAN driver won't probe
> > > anything.
> > 
> > Patch which restores usual behaviour was merged in 2.6.24-rc5
> > (3790ee4bd86396558eedd86faac1052cb782e4e1 "proc: remove/Fix proc generic d_revalidate")
> 
> Via a kerneltrap.org article (problematic internet setup here currently,
> non-C&P text terminal only) I could see that this is the patch which
> removes the d_revalidate member and the corresponding proc_revalidate_dentry().
> And this is the state that my 2.6.24-rc_six_-mm1 tree is in already.

OK.

> So either it didn't help here or it broke again by some later change or
> there's some dumb PEBKAC error here.

Do you by chance forgot CONFIG_USB_?HCI_HCD=y ? I see empty usbfs here if
they are deselected.

> > so no hotfixes are needed. I just checked with bind mounting / to
> > /proc/bus/usb -- it works.
> 
> OK, I'll try to re-check manual, raw, bare-metal mounting (bind etc.) soonish.
> 
> "CONFIG_NETNS" as mentioned in the patch description actually seems
> to be "CONFIG_NET_NS", BTW.
> (which I DON'T have set at the moment, if this happens to make a difference)

I shouldn't.
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