linux-kernel - Re: Running make install over sshfs is painful now

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Date:	Tue, 15 Jun 2010 13:32:29 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Greg Thelen <gthelen@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Running make install over sshfs is painful now

On 7.6.2010 08:53, Dmitry Torokhov wrote:
> Hi,
> 
> With the following commit running "make modules_install install" over
> sshfs (and I suppose nfs) is extremely painful:
> 
> commit fb994ecc2b1c214951366c2ba5d8b121f0010d1f
> Author: Greg Thelen <gthelen@...gle.com>
> Date:   Wed May 5 10:41:44 2010 -0700
> 
>     kbuild: Fix checking of scm-identifier variable
...

Commit 85a256d8 and this one just exposed a problem we had before with
CONFIG_LOCALVERSION_AUTO, namely that the Makefile computes the release
string on _every_ invocation:

$ strace -feexecve make help 2>&1 | grep -v ' -1 ' | grep git
[pid 13788] execve("/usr/bin/git", ["git", "rev-parse", "--verify",
"--short", "HEAD"], [/* 88 vars */]) = 0
[pid 13790] execve("/usr/bin/git", ["git", "describe", "--exact-match"],
[/* 88 vars */]) = 0
[pid 13792] execve("/usr/bin/git", ["git", "describe"], [/* 88 vars */]) = 0
[pid 13795] execve("/usr/bin/git", ["git", "config", "--get",
"svn-remote.svn.url"], [/* 88 vars */]) = 0
[pid 13796] execve("/usr/bin/git", ["git", "update-index", "--refresh",
"--unmerged"], [/* 88 vars */]) = 0
[pid 13797] execve("/usr/bin/git", ["git", "diff-index", "--name-only",
"HEAD"], [/* 88 vars */]Process 13786 suspended

> Any cfhance we could generate the tag at compile time
> as opposed to install time?

The Makefile already stores the string in include/config/kernel.release
during 'make prepare', but it is nevertheless recomputed every time.
Need to clean this up.

Michal
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