linux-kernel - 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

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Message-Id: <20190402130424.GU4102@linux.ibm.com>
Date:   Tue, 2 Apr 2019 06:04:24 -0700
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     Rong Chen <rong.a.chen@...el.com>
Cc:     kbuild test robot <lkp@...el.com>, kbuild-all@...org,
        linux-kernel@...r.kernel.org
Subject: 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'

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@...ux.ibm.com>
> >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@...el.com>
> >     Signed-off-by: Paul E. McKenney <paulmck@...ux.ibm.com>
> >     Cc: Oded Gabbay <oded.gabbay@...il.com>
> >     Cc: Alex Deucher <alexander.deucher@....com>
> >     Cc: "Christian König" <christian.koenig@....com
> >     Cc: "David (ChunMing) Zhou" <David1.Zhou@....com>
> >     Cc: David Airlie <airlied@...ux.ie>
> >     Cc: Daniel Vetter <daniel@...ll.ch>
> >
> >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;
> >
>