Hello Bruce!
I'm planning to send some patches for AXXIA branches for 4.9 linux-yocto
kernels (also some for 4.1).
First, it is still allowed to send patches for those old kernels?
Then, when preparing the AXXIA patches against the latest tag (v4.9.202) for
the preempt-rt branch (standard/preempt-rt/axxia/base) from
git://git.yoctoproject.org/linux-yocto-4.9 repo, I get a lot of build errors.
I also tried a clean poky build for qemuarm machine with linux-yocto-rt_4.9
building the latest v4.9.202 tag from standard/preempt-rt/base branch and get
the same errors. By default, 4.9 linux-yocto-rt recipe from poky (rocko branch)
uses v4.9.113 version which builds ok.
It's possible that some of the errors cames from some merge failures:
- when v4.9.163 tag wes merged to the standard/preempt-rt/base branch. There
were some extra changes in the merge commit
34a0f925427864bc92a556a533a73a12247709f4 ("Merge branch 'standard/base' into
standard/preempt-rt/base") meant to fix merge conflicts maybe, but the changes
to kernel/locking/rtmutex.c brings build errors
- when v4.9.176 tag was merged to the standard/preempt-rt/base branch. There
were some extra changes in the merge commit
369744f8022767ea2c1b6ca32f8249f5bdb1ce80 ("Merge branch 'standard/base' into
standard/preempt-rt/base") meant to fix merge conflicts maybe, but the changes
to kernel/cpu.c brings build errors
The latest good tag I found is v4.9.162.
Which is the best approach for this: working to fix all those failures in new
commits on top of v4.9.202 even if this is an EOL kernel for yocto, or should
we reset preempt-rt branches (axxia ones at least) to v4.9.162 version?
Here are some of the errors I get on qemuarm build:
tmp/work-shared/qemuarm/kernel-source/kernel/cpu.c:1118:6: error: redefinition
of 'set_cpu_possible'
void set_cpu_possible(unsigned int cpu, bool possible
tmp/work-shared/qemuarm/kernel-source/include/linux/cpumask.h:92:29: error:
expected identifier or '(' before 'const'
#define cpu_possible_mask ((const struct cpumask *)&__cpu_possible_mask)
tmp/work-shared/qemuarm/kernel-source/include/linux/export.h:60:20: error:
pasting "__kstrtab_" and "(" does not give a valid preprocessing token
static const char __kstrtab_##sym[]
tmp/work-shared/qemuarm/kernel-source/kernel/locking/rtmutex.c:351:21: error:
redefinition of 'rt_mutex_get_top_task'
| struct task_struct *rt_mutex_get_top_task(struct task_struct *task)
tmp/work-shared/qemuarm/kernel-source/kernel/locking/rtmutex.c:982:2: error:
implicit declaration of function 'rt_mutex_deadlock_account_lock'; did you mean
'rt_mutex_deadlock_check'? [-Werror=implicit-function-declaration]
| rt_mutex_deadlock_account_lock(lock, task)
Regards,
Daniel
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