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SubjectRe: hppa64-linux-ld: mm/hugetlb.o(.text+0x50dc): cannot reach printk
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Date
I would suggest the following for this hunk:

+    ldil    L%intr_restore, %r2
+    BL    preempt_schedule_irq
+    ldo     R%intr_restore(%r2), %r2

    ldil    L%intr_restore, %r1
    b,l    preempt_schedule_irq,%r2
    ldo     R%intr_restore(%r1), %r2

On PA 2.0 hardware that gives a 22-bit call.

Dave

On 2021-01-25 3:59 p.m., Helge Deller wrote:
> On 1/25/21 9:47 PM, Helge Deller wrote:
>>>>> On Sat, Jan 16, 2021 at 6:37 AM kernel test robot <lkp@intel.com> wrote:
>>>>>> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>>>>>> head: 1d94330a437a573cfdf848f6743b1ed169242c8a
>>>>>> commit: eff8728fe69880d3f7983bec3fb6cea4c306261f vmlinux.lds.h: Add PGO and AutoFDO input sections
>>>>>> date: 5 months ago
>>>>>> config: parisc-randconfig-r032-20210116 (attached as .config)
>>>>>> compiler: hppa64-linux-gcc (GCC) 9.3.0
>>>>>> reproduce (this is a W=1 build):
>>>>>> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>>>>> chmod +x ~/bin/make.cross
>>>>>> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eff8728fe69880d3f7983bec3fb6cea4c306261f
>>>>>> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>>>>> git fetch --no-tags linus master
>>>>>> git checkout eff8728fe69880d3f7983bec3fb6cea4c306261f
>>>>>> # save the attached .config to linux build tree
>>>>>> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc
>>>>>>
>>>>>> If you fix the issue, kindly add following tag as appropriate
>>>>>> Reported-by: kernel test robot <lkp@intel.com>
>>>>>>
>>>>>> All errors (new ones prefixed by >>):
>>>>>>
>>>>>> hppa64-linux-ld: mm/page_alloc.o(.ref.text+0x110): cannot reach unknown
>>>>>> hppa64-linux-ld: mm/memblock.o(.text+0x27c): cannot reach __warn_printk
>>>>>> hppa64-linux-ld: mm/memblock.o(.meminit.text+0xc4): cannot reach printk
>> ....
>>
>> The problem with this .config is, that both CONFIG_MODULES and
>> CONFIG_MLONGCALLS are set to "n".
>> The Kconfig autodetection needs fixing to enable CONFIG_MLONGCALLS in
>> this case.
>>
>>
>> This patch fixes it for me:
>>
>> [PATCH] Require -mlong-calls gcc option for !CONFIG_MODULES
>>
>> When building a kernel without module support, the CONFIG_MLONGCALL
>> option needs to be enabled. This patch fixes the autodetection in the
>> Kconfig script and uses a far call to preempt_schedule_irq() in
>> intr_do_preempt().
>>
>> Signed-off-by: Helge Deller <deller@gmx.de>
>> Reported-by: kernel test robot <lkp@intel.com>
> There's a small bug in the code below:
> BL preempt_schedule_irq
> needs to be
> BL preempt_schedule_irq, %r0
>
> I'll do some more testing and will push the final version
> through the parisc tree.
>
> Helge
>
>
>> ---
>>
>> diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
>> index 78b17621ee4a..278462186ac4 100644
>> --- a/arch/parisc/Kconfig
>> +++ b/arch/parisc/Kconfig
>> @@ -202,9 +202,8 @@ config PREFETCH
>> depends on PA8X00 || PA7200
>>
>> config MLONGCALLS
>> - bool "Enable the -mlong-calls compiler option for big kernels"
>> - default y if !MODULES || UBSAN || FTRACE
>> - default n
>> + def_bool y if !MODULES || UBSAN || FTRACE
>> + bool "Enable the -mlong-calls compiler option for big kernels" if MODULES && !UBSAN && !FTRACE
>> depends on PA8X00
>> help
>> If you configure the kernel to include many drivers built-in instead
>> diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
>> index beba9816cc6c..6320f6a8397c 100644
>> --- a/arch/parisc/kernel/entry.S
>> +++ b/arch/parisc/kernel/entry.S
>> @@ -997,10 +997,19 @@ intr_do_preempt:
>> bb,<,n %r20, 31 - PSW_SM_I, intr_restore
>> nop
>>
>> - BL preempt_schedule_irq, %r2
>> - nop
>> + /* ssm PSW_SM_I done later in intr_restore */
>> +#ifdef CONFIG_MLONGCALLS
>> + ldil L%intr_restore, %r2
>> + load32 preempt_schedule_irq, %r1
>> + bv %r0(%r1)
>> + ldo R%intr_restore(%r2), %r2
>> +#else
>> + ldil L%intr_restore, %r2
>> + BL preempt_schedule_irq
>> + ldo R%intr_restore(%r2), %r2
>> +#endif
>> +
>>
>> - b,n intr_restore /* ssm PSW_SM_I done by intr_restore */
>> #endif /* CONFIG_PREEMPTION */
>>
>> /*
>>
>>


--
John David Anglin dave.anglin@bell.net

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