linux-kernel - Re: Bisected Regression 4.3.5 => 4.4.1 booting HP ZBook in EFI mode

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Date:	Fri, 5 Feb 2016 17:09:58 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Phil Turmel <philip@...mel.org>
Cc:	Boqun Feng <boqun.feng@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: Bisected Regression 4.3.5 => 4.4.1 booting HP ZBook in EFI mode

On Fri, Feb 05, 2016 at 06:41:56PM -0500, Phil Turmel wrote:
> On 02/05/2016 05:29 PM, Greg Kroah-Hartman wrote:
> > On Fri, Feb 05, 2016 at 04:48:52PM -0500, Phil Turmel wrote:
> 
> >> I'm stumped as to how that powerpc patch can affect my x86 laptop, an
> >> HP ZBook 17 w/ i7 processor & nouveau graphics, but it certainly
> >> does.  The bisect was stable and I confirmed by reverting it on
> >> top of the intended v4.4.1.
> > 
> > That's crazy, nothing should even be rebuilt if you revert that patch,
> > so I don't see how that could affect things here.
> 
> I thought so too, but ...
> 
> > Can you verify that nothing does get rebuilt when you do this?
> 
> # git checkout v4.4.1
> 
> # make -j15
> ////// lots of output ///////
> 
> # make
>   CHK     include/config/kernel.release
>   CHK     include/generated/uapi/linux/version.h
>   CHK     include/generated/utsrelease.h
>   CHK     include/generated/bounds.h
>   CHK     include/generated/timeconst.h
>   CHK     include/generated/asm-offsets.h
>   CALL    scripts/checksyscalls.sh
>   CHK     include/generated/compile.h
>   CHK     kernel/config_data.h
> Kernel: arch/x86/boot/bzImage is ready  (#133)
>   Building modules, stage 2.
>   MODPOST 1166 modules
> 
> # git revert badc688
> ////// trimmed commit log ///////
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> # make
>   CHK     include/config/kernel.release
>   UPD     include/config/kernel.release
>   CHK     include/generated/uapi/linux/version.h
>   CHK     include/generated/utsrelease.h
>   UPD     include/generated/utsrelease.h
>   CHK     include/generated/bounds.h
>   CHK     include/generated/timeconst.h
>   CHK     include/generated/asm-offsets.h
>   CALL    scripts/checksyscalls.sh
>   CHK     include/generated/compile.h
>   CC      init/version.o
>   LD      init/built-in.o
>   CC      kernel/sys.o
>   CC      kernel/trace/trace.o
>   LD      kernel/trace/built-in.o
>   CC      kernel/module.o
>   CHK     kernel/config_data.h
>   LD      kernel/built-in.o
>   CC      drivers/base/firmware_class.o
>   LD      drivers/base/built-in.o
>   CC      drivers/gpu/drm/i915/i915_gpu_error.o
>   LD      drivers/gpu/drm/i915/i915.o
>   LD      drivers/gpu/drm/i915/built-in.o
>   LD      drivers/gpu/drm/built-in.o
>   LD      drivers/gpu/built-in.o
>   CC      drivers/target/target_core_configfs.o
>   LD      drivers/target/target_core_mod.o
>   LD      drivers/target/built-in.o
>   CC [M]  drivers/vhost/scsi.o
>   LD [M]  drivers/vhost/vhost_scsi.o
>   LD      drivers/built-in.o
>   LINK    vmlinux
>   LD      vmlinux.o
>   MODPOST vmlinux.o
>   GEN     .version
>   CHK     include/generated/compile.h
>   UPD     include/generated/compile.h
>   CC      init/version.o
>   LD      init/built-in.o
>   KSYM    .tmp_kallsyms1.o
>   KSYM    .tmp_kallsyms2.o
>   LD      vmlinux
>   SORTEX  vmlinux
>   SYSMAP  System.map
>   VOFFSET arch/x86/boot/voffset.h
>   OBJCOPY arch/x86/boot/compressed/vmlinux.bin
>   LZMA    arch/x86/boot/compressed/vmlinux.bin.lzma
>   MKPIGGY arch/x86/boot/compressed/piggy.S
>   AS      arch/x86/boot/compressed/piggy.o
>   LD      arch/x86/boot/compressed/vmlinux
>   ZOFFSET arch/x86/boot/zoffset.h
>   AS      arch/x86/boot/header.o
>   CC      arch/x86/boot/version.o
>   LD      arch/x86/boot/setup.elf
>   OBJCOPY arch/x86/boot/setup.bin
>   OBJCOPY arch/x86/boot/vmlinux.bin
>   BUILD   arch/x86/boot/bzImage
> Setup is 15564 bytes (padded to 15872 bytes).
> System is 26558 kB
> CRC 29b78b83
> Kernel: arch/x86/boot/bzImage is ready  (#134)
>   Building modules, stage 2.
>   MODPOST 1166 modules
> 
> //////
> So, a handful of items in the main kernel get
> rebuilt, including i915 stuff.  This laptop does
> have the intel graphics base with nvidia layered
> on top.
> 
> The build proceeded to redo all my modules, shown below.

Ah, you have versioned modules / builds enabled, that's what caused the
rebuild, if you disable CONFIG_MODVERSIONS and
CONFIG_MODULE_SRCVERSION_ALL you shouldn't rebuild everything.

If those options are disabled, then something really odd is going on
here...

thanks,

greg k-h