linux-kernel - Re: [regression ?] kbuild: fix building bzImage with CONFIG_TRIM_UNUSED

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Date:   Sat, 10 Dec 2016 16:23:05 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Jarod Wilson <jarod@...hat.com>,
        Michal Marek <mmarek@...e.com>, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [regression ?] kbuild: fix building bzImage with
 CONFIG_TRIM_UNUSED_KSYMS enabled

On (12/09/16 13:07), Nicolas Pitre wrote:
[..]
> > build:
> > make -j4 > build_log 2>&1
> > 
> > package:
> > make -j4 INSTALL_MOD_PATH="${pkgdir}" modules_install >> build_log 2>&1
> 
> Weird.

it is. sorry for long reply, it took me some time to track it down.
turned out, the script also does `prepare' and `kernelrelease'. so
the sequence of commands in my build script is

	make prepare
	make kernelrelease
# functon build
	make -j4
# finction package
	make -j4 INSTALL_MOD_PATH=XXXX modules_install


now. the problem here is that, apparently, and I didn't know that,
"make prepare" and "make kernelrelease" are executed twice.

- first time when I build the kernel
 make prepare
 make kernelrelease
 make -j4

- second time when I install the modules
 make prepare
 make kernelrelease
 make -j4 INSTALL_MOD_PATH=XXXX modules_install


so this will not install modules:
 make prepare; make kernelrelease; make -j4; make prepare; make kernelrelease; make -j4 INSTALL_MOD_PATH=/tmp/MODULES modules_install

and this will:
 make prepare; make kernelrelease; make -j4; make kernelrelease; make -j4 INSTALL_MOD_PATH=/tmp/MODULES modules_install


> You must have CONFIG_TRIM_UNUSED_KSYMS=y in your .config, right?

yes.

> What if you set it to n instead without reverting 865563924022d8. Do you 
> still have the same issue?

!CONFIG_TRIM_UNUSED_KSYMS or !865563924022d8 builds just fine with extra
`make prepare'.
no `extra make prepare' builds ok regardless the state of Makefile/config
files.

I guess you don't need my .config any more.

	-ss