linux-next: build failure in Linus' tree

[Daniel Axtens]

Thanks sfr and mpe.

> Applied to powerpc/fixes.
>
> [1/1] powerpc/64s: Fix allnoconfig build since uaccess flush
>       https://git.kernel.org/powerpc/c/b6b79dd53082db11070b4368d85dd6699ff0b063

We also needed a similar fix for stable, which has also been applied.

I guess I should build some sort of build process that tests a whole
range of configs. I did test a few but clearly not enough. Is there a
known list that I should be using? Something from kisskb?

Kind regards,
Daniel

Michael Ellerman <patch-notifications at ellerman.id.au> writes:

> On Mon, 23 Nov 2020 18:40:16 +1100, Stephen Rothwell wrote:
>> After merging most of the trees, today's linux-next build (powerpc64
>> allnoconfig) failed like this:
>> 
>> In file included from arch/powerpc/include/asm/kup.h:18,
>>                  from arch/powerpc/include/asm/uaccess.h:9,
>>                  from include/linux/uaccess.h:11,
>>                  from include/linux/sched/task.h:11,
>>                  from include/linux/sched/signal.h:9,
>>                  from include/linux/rcuwait.h:6,
>>                  from include/linux/percpu-rwsem.h:7,
>>                  from include/linux/fs.h:33,
>>                  from include/linux/compat.h:17,
>>                  from arch/powerpc/kernel/asm-offsets.c:14:
>> arch/powerpc/include/asm/book3s/64/kup-radix.h:66:1: warning: data definition has no type or storage class
>>    66 | DECLARE_STATIC_KEY_FALSE(uaccess_flush_key);
>>       | ^~~~~~~~~~~~~~~~~~~~~~~~
>> arch/powerpc/include/asm/book3s/64/kup-radix.h:66:1: error: type defaults to 'int' in declaration of 'DECLARE_STATIC_KEY_FALSE' [-Werror=implicit-int]
>> arch/powerpc/include/asm/book3s/64/kup-radix.h:66:1: warning: parameter names (without types) in function declaration
>> arch/powerpc/include/asm/book3s/64/kup-radix.h: In function 'prevent_user_access':
>> arch/powerpc/include/asm/book3s/64/kup-radix.h:180:6: error: implicit declaration of function 'static_branch_unlikely' [-Werror=implicit-function-declaration]
>>   180 |  if (static_branch_unlikely(&uaccess_flush_key))
>>       |      ^~~~~~~~~~~~~~~~~~~~~~
>> arch/powerpc/include/asm/book3s/64/kup-radix.h:180:30: error: 'uaccess_flush_key' undeclared (first use in this function)
>>   180 |  if (static_branch_unlikely(&uaccess_flush_key))
>>       |                              ^~~~~~~~~~~~~~~~~
>> arch/powerpc/include/asm/book3s/64/kup-radix.h:180:30: note: each undeclared identifier is reported only once for each function it appears in
>> arch/powerpc/include/asm/book3s/64/kup-radix.h: In function 'prevent_user_access_return':
>> arch/powerpc/include/asm/book3s/64/kup-radix.h:189:30: error: 'uaccess_flush_key' undeclared (first use in this function)
>>   189 |  if (static_branch_unlikely(&uaccess_flush_key))
>>       |                              ^~~~~~~~~~~~~~~~~
>> arch/powerpc/include/asm/book3s/64/kup-radix.h: In function 'restore_user_access':
>> arch/powerpc/include/asm/book3s/64/kup-radix.h:198:30: error: 'uaccess_flush_key' undeclared (first use in this function)
>>   198 |  if (static_branch_unlikely(&uaccess_flush_key) && flags == AMR_KUAP_BLOCKED)
>>       |                              ^~~~~~~~~~~~~~~~~
>> 
>> [...]
>