Bug 432604 – sys-kernel/genkernel-3.4.24_p2 with kernel 3.4.9 - In function ‘lpfc_bg_setup_bpl’: drivers/scsi/lpfc/lpfc_scsi.c:1900:11: error: unused variable ‘rc’

• Status: RESOLVED FIXED
• Product: Gentoo Hosted Projects

[Description Vladimir Romanov (RETIRED) 2012-08-24 15:36:03 UTC]

Created attachment 322116 [details]
Genkernel log

Genkernel begins to compile kernel, goes to warning (unused variable rc), and says that in kernel all warnings considered as bugs.

Genkernel log attached

[Comment 1 Sebastian Pipping 2012-08-24 18:27:42 UTC]

Vladimir, please translate the bug title to English.  Preferably, provide an English-only log, too.  Thanks.

[Comment 2 Jeroen Roovers (RETIRED) 2012-08-25 13:05:41 UTC]

*** Bug 432630 has been marked as a duplicate of this bug. ***

[Comment 3 Vladimir Romanov (RETIRED) 2012-08-25 14:38:18 UTC]

Created attachment 322194 [details]
Genkernel log in english

[Comment 4 Shawn Kovalchick 2012-08-27 15:51:47 UTC]

Created attachment 322376 [details]
Genkernel log showing the same error

[Comment 5 Ben Kohler 2012-08-28 02:07:16 UTC]

Fixed upstream here: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=0829a19a6142af09eb4f9509cd1d3666270e87bd

Backport for 3.4.9 maybe?  This is not a good situation where stable genkernel + gentoo-sources fails for new users.

[Comment 6 Vladimir Romanov (RETIRED) 2012-08-28 04:58:51 UTC]

Yes, it compiles perfectly with patch

[Comment 7 Sebastian Pipping 2012-08-28 22:40:18 UTC]

Re-assigning to Kernel team, the issue may not be specific to genkernel.  Please assign back if it is.  Thanks!

[Comment 8 Ben Kohler 2012-08-29 03:19:50 UTC]

Right, this is a kernel bug-- but it happens to affect a huge percentage of amd64 genkernel users (those who do "genkernel all" or another target including modules, but don't manually go into menuconfig to work around this), and almost no one else.  It's a bug on a very obscure driver which genkernel happens to build.  The driver in question is for "Emulex LightPulse Fibre Channel Support" (CONFIG_SCSI_LPFC).

The current workaround for genkernel users (besides the patch) is to use --menuconfig, and manually enable CONFIG_DEBUG_FS (in "Kernel Hacking") then CONFIG_SCSI_LPFC_DEBUG_FS (in "SCSI low-level drivers").

[Comment 9 Mike Pagano 2012-08-29 13:56:24 UTC]

That patch applies cleanly to 3.4.9 for someone?

[Comment 10 Ben Kohler 2012-08-29 14:26:39 UTC]

Created attachment 322511 [details, diff]
lpfs-nodebug-fix.patch

The upstream patch does not apply as-is to 3.4.9, but this one does.

[Comment 11 Mike Pagano 2012-08-29 15:19:18 UTC]

*** Bug 433032 has been marked as a duplicate of this bug. ***

[Comment 12 Mike Pagano 2012-08-29 19:06:29 UTC]

This is applied and released in gentoo-sources-3.4.10

[Comment 13 Erik Dobak 2012-08-30 13:05:19 UTC]

Created attachment 322585 [details]
same issue

[Comment 14 Erik Dobak 2012-08-30 13:22:37 UTC]

lpfc=LightPulseFibreChannel ? why do i need this???

[Comment 15 Kristian Duus Østergaard 2012-08-30 13:38:35 UTC]

(In reply to comment #14)
> lpfc=LightPulseFibreChannel ? why do i need this???

You probably don't but genkernel chooses a lot of drivers to build as module. To solve it do make menuconfig - disable all the LPFC stuff and you will be able to build the kernel.

[Comment 16 Erik Dobak 2012-08-30 13:41:00 UTC]

lpfc=LightPulseFibreChannel ? why do i need this???(In reply to comment #8)
> Right, this is a kernel bug-- but it happens to affect a huge percentage of
> amd64 genkernel users (those who do "genkernel all" or another target
> including modules, but don't manually go into menuconfig to work around
> this), and almost no one else.  It's a bug on a very obscure driver which
> genkernel happens to build.  The driver in question is for "Emulex
> LightPulse Fibre Channel Support" (CONFIG_SCSI_LPFC).
> 
> The current workaround for genkernel users (besides the patch) is to use
> --menuconfig, and manually enable CONFIG_DEBUG_FS (in "Kernel Hacking") then
> CONFIG_SCSI_LPFC_DEBUG_FS (in "SCSI low-level drivers").

started genkernel --menuconfig all. enabled CONFIG_SCSI_LPFC and LightPulse Fibre Channel Support aka CONFIG_SCSI_LPFC from Emulex.

success i have a a new 3.4.9-gentoo kernel.

[Comment 17 Erik Dobak 2012-08-30 13:42:48 UTC]

(In reply to comment #15)
> (In reply to comment #14)
> > lpfc=LightPulseFibreChannel ? why do i need this???
> 
> You probably don't but genkernel chooses a lot of drivers to build as
> module. To solve it do make menuconfig - disable all the LPFC stuff and you
> will be able to build the kernel.

i would disable more SCSI stuff i need only 'probe all luns'

[Comment 18 Ben Kohler 2012-08-30 16:03:07 UTC]

Oops, in my last comment I meant to mention there were TWO workarounds, but I only managed to explain the more complicated one.  Of course you can also simply *disable* CONFIG_SCSI_LPFC.

The more complicated workaround is really only good to verify that the patch is indeed doing the right thing.

[Comment 19 Mike Pagano 2012-09-10 16:51:58 UTC]

Can someone attach their .config, please? (config.gz)

[Comment 20 Erik Dobak 2012-09-10 19:37:58 UTC]

Created attachment 323446 [details]
all scsi low level drivers disabled.

[Comment 21 Erik Dobak 2012-09-10 19:54:02 UTC]

Created attachment 323448 [details]
with scsi low level drivers

but configured like it is described here: https://bugs.gentoo.org/show_bug.cgi?id=432604#c8

[Comment 22 Sergey Popov 2012-10-24 16:37:56 UTC]

*** Bug 438542 has been marked as a duplicate of this bug. ***