Re: [BUG] 4.13.0 kernel build error on Alpha

[Michael Cree]

On Sun, Sep 10, 2017 at 10:23:40PM -0500, Bob Tracy wrote:
> On Sun, Sep 10, 2017 at 10:16:41PM -0500, Bob Tracy wrote:
> > On Sun, Sep 10, 2017 at 07:59:40PM -0700, Matt Turner wrote:
> > > On Sun, Sep 10, 2017 at 3:34 PM, Bob Tracy  wrote:
> > > > Here we go again :-(.  Tool versions as follows:
> > > > (...)
> > > >
> > > >   MODPOST vmlinux.o
> > > > WARNING: EXPORT symbol "callback_setenv" [vmlinux] version generation 
> > > > failed, symbol will not be versioned.
> > > > (...)
> > > > WARNING: modpost: Found 24 section mismatch(es).
> > > > To see full details build your kernel with:
> > > > 'make CONFIG_DEBUG_SECTION_MISMATCH=y'
> > > 
> > > All of this is fixed by
> > > 
> > > commit 873f9b5bcbf27f6e89e1879714abe4532cacf5d7
> > > Author: Ben Hutchings 
> > > Date:   Wed Jul 19 01:01:16 2017 +0100
> > > 
> > > alpha: Restore symbol versions for symbols exported from assembly
> > 
> > I guess that commit hasn't made it into Linus' tree :-(.  If the patch
> > is short, please forward if you would be so kind.  Many thanks in
> > advance.
> 
> Never mind.  Linus pulled it five days ago as I type this.  The fixes
> obviously didn't make it in time for 4.13-final, but should be in 4.14.

4.13 final builds fine for me when building for a DP264 alpha config.

But I do recommend you revert 6cd9dc3e75078ef646076fa63adfb9b85ced0b66
(mm/compaction.c: fix zoneindex in kcompactd()) in your build of the
kernel for Alpha as it causes random segfaults in user space.
Unfortunately no one took any notice when I reported this some time
ago.

Cheers
Michael.
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Re: [BUG] 4.13.0 kernel build error on Alpha

[Bob Tracy]

On Sun, Sep 10, 2017 at 07:59:40PM -0700, Matt Turner wrote:
> On Sun, Sep 10, 2017 at 3:34 PM, Bob Tracy  wrote:
> > Here we go again :-(.  Tool versions as follows:
> >
> > gcc version 7.2.0 (Debian 7.2.0-3)
> > GNU ld (GNU Binutils for Debian) 2.29 (binutils 2.29-9)
> >
> > Note evidence of the ".alphalib" section patch first tried with the 4.9
> > kernel source.  It has worked well up through 4.12.  I didn't try
> > building any of the 4.13 release candidates because of all the compiler
> > updates that came through during that time.
> >
> >   MODPOST vmlinux.o
> > WARNING: EXPORT symbol "callback_setenv" [vmlinux] version generation 
> > failed, symbol will not be versioned.
> > (...)
> > WARNING: modpost: Found 24 section mismatch(es).
> > To see full details build your kernel with:
> > 'make CONFIG_DEBUG_SECTION_MISMATCH=y'
> 
> All of this is fixed by
> 
> commit 873f9b5bcbf27f6e89e1879714abe4532cacf5d7
> Author: Ben Hutchings 
> Date:   Wed Jul 19 01:01:16 2017 +0100
> 
> alpha: Restore symbol versions for symbols exported from assembly

I guess that commit hasn't made it into Linus' tree :-(.  If the patch
is short, please forward if you would be so kind.  Many thanks in
advance.

> > arch/alpha/lib/memmove.o: In function `memmove':
> > (.alphalib+0x2c): relocation truncated to fit: BRSGP against symbol 
> > `memcpy' defined in .text section in arch/alpha/lib/memcpy.o
> > Makefile:1000: recipe for target 'vmlinux' failed
> > make: *** [vmlinux] Error 1
> 
> I have not yet seen this.

I *think* what I want to do is the equivalent of the ".S" file
'.text --> .section .alphalib,"ax"' substitution for the affected ".c"
files in "arch/alpha/lib".  At the risk of baring my ignorance to the
world, is there a straightforward way of accomplishing that?  The
"objdump" tool confirms it's not a strict renaming of one section
to another: the ".text" section still exists in the compiled ".S"
files that were patched.

--Bob
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Re: [BUG] 4.13.0 kernel build error on Alpha

[Matt Turner]

On Sun, Sep 10, 2017 at 3:34 PM, Bob Tracy  wrote:
> Here we go again :-(.  Tool versions as follows:
>
> gcc version 7.2.0 (Debian 7.2.0-3)
> GNU ld (GNU Binutils for Debian) 2.29 (binutils 2.29-9)
>
> Note evidence of the ".alphalib" section patch first tried with the 4.9
> kernel source.  It has worked well up through 4.12.  I didn't try
> building any of the 4.13 release candidates because of all the compiler
> updates that came through during that time.
>
>   MODPOST vmlinux.o
> WARNING: EXPORT symbol "callback_setenv" [vmlinux] version generation failed, 
> symbol will not be versioned.
> WARNING: EXPORT symbol "strrchr" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "__divl" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "__divqu" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "__memsetw" [vmlinux] version generation failed, 
> symbol will not be versioned.
> WARNING: EXPORT symbol "strchr" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "__reml" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "strcat" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "__copy_user" [vmlinux] version generation failed, 
> symbol will not be versioned.
> WARNING: EXPORT symbol "__remq" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "clear_page" [vmlinux] version generation failed, 
> symbol will not be versioned.
> WARNING: EXPORT symbol "strncpy" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "memmove" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "__remqu" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "memchr" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "__memset" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "copy_page" [vmlinux] version generation failed, 
> symbol will not be versioned.
> WARNING: EXPORT symbol "__divlu" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "strlen" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "strncat" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "callback_save_env" [vmlinux] version generation 
> failed, symbol will not be versioned.
> WARNING: EXPORT symbol "memset" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: "saved_config" [vmlinux] is COMMON symbol
> WARNING: EXPORT symbol "__clear_user" [vmlinux] version generation failed, 
> symbol will not be versioned.
> WARNING: EXPORT symbol "callback_getenv" [vmlinux] version generation failed, 
> symbol will not be versioned.
> WARNING: EXPORT symbol "__divq" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "strcpy" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "___memset" [vmlinux] version generation failed, 
> symbol will not be versioned.
> WARNING: EXPORT symbol "__remlu" [vmlinux] version generation failed, symbol 
> will not be versioned.
> WARNING: EXPORT symbol "csum_ipv6_magic" [vmlinux] version generation failed, 
> symbol will not be versioned.
> WARNING: EXPORT symbol "__constant_c_memset" [vmlinux] version generation 
> failed, symbol will not be versioned.
> WARNING: modpost: Found 24 section mismatch(es).
> To see full details build your kernel with:
> 'make CONFIG_DEBUG_SECTION_MISMATCH=y'

All of this is fixed by

commit 873f9b5bcbf27f6e89e1879714abe4532cacf5d7
Author: Ben Hutchings 
Date:   Wed Jul 19 01:01:16 2017 +0100

alpha: Restore symbol versions for symbols exported from assembly


> arch/alpha/lib/memmove.o: In function `memmove':
> (.alphalib+0x2c): relocation truncated to fit: BRSGP against symbol `memcpy' 
> defined in .text section in arch/alpha/lib/memcpy.o
> Makefile:1000: recipe for target 'vmlinux' failed
> make: *** [vmlinux] Error 1

I have not yet seen this.

The kernel seemed to be in good shape after my two pull requests were
merged. (commit dd689a68bc3 for 4.13 and commit 6caffe21dde for
4.13-rc1)
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[BUG] 4.13.0 kernel build error on Alpha

[Bob Tracy]

Here we go again :-(.  Tool versions as follows:

gcc version 7.2.0 (Debian 7.2.0-3)
GNU ld (GNU Binutils for Debian) 2.29 (binutils 2.29-9)

Note evidence of the ".alphalib" section patch first tried with the 4.9
kernel source.  It has worked well up through 4.12.  I didn't try
building any of the 4.13 release candidates because of all the compiler
updates that came through during that time.

  MODPOST vmlinux.o
WARNING: EXPORT symbol "callback_setenv" [vmlinux] version generation failed, 
symbol will not be versioned.
WARNING: EXPORT symbol "strrchr" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "__divl" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "__divqu" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "__memsetw" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "strchr" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "__reml" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "strcat" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "__copy_user" [vmlinux] version generation failed, 
symbol will not be versioned.
WARNING: EXPORT symbol "__remq" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "clear_page" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "strncpy" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "memmove" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "__remqu" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "memchr" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "__memset" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "copy_page" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "__divlu" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "strlen" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "strncat" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "callback_save_env" [vmlinux] version generation failed, 
symbol will not be versioned.
WARNING: EXPORT symbol "memset" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: "saved_config" [vmlinux] is COMMON symbol
WARNING: EXPORT symbol "__clear_user" [vmlinux] version generation failed, 
symbol will not be versioned.
WARNING: EXPORT symbol "callback_getenv" [vmlinux] version generation failed, 
symbol will not be versioned.
WARNING: EXPORT symbol "__divq" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "strcpy" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "___memset" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "__remlu" [vmlinux] version generation failed, symbol 
will not be versioned.
WARNING: EXPORT symbol "csum_ipv6_magic" [vmlinux] version generation failed, 
symbol will not be versioned.
WARNING: EXPORT symbol "__constant_c_memset" [vmlinux] version generation 
failed, symbol will not be versioned.
WARNING: modpost: Found 24 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
arch/alpha/lib/memmove.o: In function `memmove':
(.alphalib+0x2c): relocation truncated to fit: BRSGP against symbol `memcpy' 
defined in .text section in arch/alpha/lib/memcpy.o
Makefile:1000: recipe for target 'vmlinux' failed
make: *** [vmlinux] Error 1

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