Fix kcl_kthread.h:24:6: error: redefinition of ‘kthread_use_mm’

[bensallen]

Testing on OpenSUSE 15.2 with the 5.3.18-lp152.57-default kernel, the rock-dkms package fails to compile due to:

/var/lib/dkms/amdgpu/4.0-23.el7/build/include/kcl/kcl_kthread.h:24:6: error: redefinition of ‘kthread_use_mm’
 void kthread_use_mm(struct mm_struct *mm)

Updates the m4 macro AC_AMDGPU_KTHREAD_USE_MM, to use AC_KERNEL_TRY_COMPILE to try to include the header and call kthread_use_mm and kthread_unuse_mm functions.

It appears the issue with using AC_KERNEL_CHECK_SYMBOL_EXPORT on at least OpenSUSE 15.2, is it doesn't appear this 5.3 kernel exports those functions:

 # grep -E 'kthread_use_mm|kthread_unuse_mm' /usr/src/linux-5.3.18-lp152.57-obj/x86_64/default/Module.symvers 
 # 

Signed-off-by: Benjamin S. Allen [email protected]

[kentrussell]

We've got this fixed in 4.1. Thanks for contributing!