Re: [rcu:dev.2019.03.20b 54/83] drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_process.c:50:1: error: type defaults to 'int' in declaration of 'DEFINE_SRCU'

From: Paul E. McKenney
Date: Tue Apr 02 2019 - 09:04:29 EST


On Tue, Apr 02, 2019 at 08:32:45AM +0800, Rong Chen wrote:
>
> On 3/28/19 3:57 AM, Paul E. McKenney wrote:
> >On Mon, Mar 25, 2019 at 02:34:27AM +0800, kbuild test robot wrote:
> >>tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2019.03.20b
> >>head: 6d4434b4b4df791620743178e1419de882b44c7b
> >>commit: eb89abcb30733e3a2343dda23cb6d81cc17c60b3 [54/83] rcu: Forbid DEFINE{,_STATIC}_SRCU() from modules
> >>config: x86_64-randconfig-b0-03250021 (attached as .config)
> >>compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
> >>reproduce:
> >> git checkout eb89abcb30733e3a2343dda23cb6d81cc17c60b3
> >> # save the attached .config to linux build tree
> >> make ARCH=x86_64
> >>
> >>All errors (new ones prefixed by >>):
> >>
> >> drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_process.c:50:1: warning: data definition has no type or storage class
> >> DEFINE_SRCU(kfd_processes_srcu);
> >> ^~~~~~~~~~~
> >>>>drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_process.c:50:1: error: type defaults to 'int' in declaration of 'DEFINE_SRCU' [-Werror=implicit-int]
> >> drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_process.c:50:1: warning: parameter names (without types) in function declaration
> >> cc1: some warnings being treated as errors
> >I don't have that hardware, but does the following help? (It at least
> >builds for me, but your mileage may vary.)
>
> Yes, the patch works for kbuild robot.

Thank you very much! May I add your Tested-by?

Thanx, Paul

> Thanks,
> Rong Chen
>
>
> >
> >------------------------------------------------------------------------
> >
> >commit b30be5a76070402912437fa23b43de11cb1973f4
> >Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxx>
> >Date: Wed Mar 27 12:53:36 2019 -0700
> >
> > drivers/gpu/drm/amd: Dynamically allocate kfd_processes_srcu
> > Having DEFINE_SRCU() or DEFINE_STATIC_SRCU() in a loadable module
> > requires that the size of the reserved region be increased, which is
> > not something we really want to be doing. This commit therefore removes
> > the DEFINE_STATIC_SRCU() from drivers/gpu/drm/amd/amdkfd/kfd_process.c in
> > favor of defining kfd_processes_srcu as a simple srcu_struct, initializing
> > it in amdgpu_amdkfd_init(), and cleaning it up in amdgpu_amdkfd_fini().
> > Reported-by: kbuild test robot <lkp@xxxxxxxxx>
> > Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxx>
> > Cc: Oded Gabbay <oded.gabbay@xxxxxxxxx>
> > Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> > Cc: "Christian König" <christian.koenig@xxxxxxx
> > Cc: "David (ChunMing) Zhou" <David1.Zhou@xxxxxxx>
> > Cc: David Airlie <airlied@xxxxxxxx>
> > Cc: Daniel Vetter <daniel@xxxxxxxx>
> >
> >diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
> >index fe1d7368c1e6..eadb20dee867 100644
> >--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
> >+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
> >@@ -28,6 +28,8 @@
> > #include <linux/module.h>
> > #include <linux/dma-buf.h>
> >+extern struct srcu_struct kfd_processes_srcu;
> >+
> > static const unsigned int compute_vmid_bitmap = 0xFF00;
> > /* Total memory size in system memory and all GPU VRAM. Used to
> >@@ -40,6 +42,8 @@ int amdgpu_amdkfd_init(void)
> > struct sysinfo si;
> > int ret;
> >+ ret = init_srcu_struct(&kfd_processes_srcu);
> >+ WARN_ON(ret);
> > si_meminfo(&si);
> > amdgpu_amdkfd_total_mem_size = si.totalram - si.totalhigh;
> > amdgpu_amdkfd_total_mem_size *= si.mem_unit;
> >@@ -57,6 +61,7 @@ int amdgpu_amdkfd_init(void)
> > void amdgpu_amdkfd_fini(void)
> > {
> > kgd2kfd_exit();
> >+ cleanup_srcu_struct(&kfd_processes_srcu);
> > }
> > void amdgpu_amdkfd_device_probe(struct amdgpu_device *adev)
> >diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> >index 4bdae78bab8e..98b694068b8a 100644
> >--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> >+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> >@@ -47,7 +47,7 @@ struct mm_struct;
> > DEFINE_HASHTABLE(kfd_processes_table, KFD_PROCESS_TABLE_SIZE);
> > static DEFINE_MUTEX(kfd_processes_mutex);
> >-DEFINE_SRCU(kfd_processes_srcu);
> >+struct srcu_struct kfd_processes_srcu;
> > /* For process termination handling */
> > static struct workqueue_struct *kfd_process_wq;
> >
>