[PATCH 1/2] drm/i915/dmabuf: fix broken build

[Lucas De Marchi]

On Wed, Oct 27, 2021 at 08:57:48AM +0100, Matthew Auld wrote:
>On Thu, 21 Oct 2021 at 13:54, Matthew Auld <matthew.auld at intel.com> wrote:
>>
>> wbinvd_on_all_cpus() is only defined on x86 it seems, plus we need to
>> include asm/smp.h here.
>>
>> Reported-by: kernel test robot <lkp at intel.com>
>> Signed-off-by: Matthew Auld <matthew.auld at intel.com>
>> Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
>
>Jani, would it make sense to cherry-pick this to -fixes? The offending
>commit is in drm-next, and there have been a few reports around this.
>
>Fixes: a035154da45d ("drm/i915/dmabuf: add paranoid flush-on-acquire")
>
>
>> ---
>>  drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
>> index 1adcd8e02d29..a45d0ec2c5b6 100644
>> --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
>> +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
>> @@ -12,6 +12,13 @@
>>  #include "i915_gem_object.h"
>>  #include "i915_scatterlist.h"
>>
>> +#if defined(CONFIG_X86)
>> +#include <asm/smp.h>
>> +#else
>> +#define wbinvd_on_all_cpus() \
>> +       pr_warn(DRIVER_NAME ": Missing cache flush in %s\n", __func__)


not sure I understand why this is a fix. Sure, it's true, but right now
this file can't be built on any other arch.

For clflush, wbind, etc, I'd rather change the code to use things from
drm_cache rather than ifdef it out locally. This is
"Reported-by: kernel test robot <lkp at intel.com>", but what's the error?

Lucas De Marchi

>> +#endif
>> +
>>  I915_SELFTEST_DECLARE(static bool force_different_devices;)
>>
>>  static struct drm_i915_gem_object *dma_buf_to_obj(struct dma_buf *buf)
>> --
>> 2.26.3
>>