Johannes Engel wrote:
> Thomas Hellström wrote:
>> Johannes,
>>
>> If the patch works, it looks correct to me.
>> However, you need to make sure (using defines) that the code will
>> compile also on kernels that don't have the .fault method.
>>
>> /Thomas
> Hi Thomas,
>
> thanks for reviewing and suggesting. :)
> I created a new variable DRM_HAS_FAULT which is defined for kernels from
> 2.6.23 and decides about using .fault or .nopfn.
> I attach a corrected version.
Wow, there are a lot ifdefs in the code. You could remove most of them
if you do something like:
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23))
#define DRM_HAS_FAULT
#define DRM_FAULT_SIGBUS VM_FAULT_SIGBUS
#else
#define DRM_FAULT_SIGBUS NOPFN_SIGBUS
#endif
and then use DRM_FAULT_SIGBUS in the code below.
Also, why don't you take these two ifdefs together?
+#ifdef DRM_HAS_FAULT
+ unsigned long address = (unsigned long)vmf->virtual_address;
+#endif
int err;
unsigned long bus_base;
unsigned long bus_offset;
unsigned long bus_size;
+#ifdef DRM_HAS_FAULT
+ int ret = VM_FAULT_NOPAGE;
+#else
unsigned long ret = NOPFN_REFAULT;
+#endif
tom
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