Dave Hansen wrote:
The only arch with phys_to_pfn() defined is UML, so the patch simplyoops, I forgot to send the part of the patch that defines these macros, sorry.
won't compile anything but UML on current kernels (unless I'm missing
something).
Could you try to give us a more complete description of your problem? I
know your memory doesn't start at 0x0, but what problems does that
cause? Does the mem_map[] allocation blow up, etc...
yes, it actually intends to solve that.
This is another solution indeed...But you will have to define another constant whichIf it's just mem_map[], That calculation could be fixed pretty easily. Something like
+#ifdef CONFIG_CRAZY_MIPS_FOO_MEM_MAP_START... +extern unsigned long mem_map_start_pfn
+#else
+#define mem_map_start_pfn 0UL
+#endif
-#define pfn_to_page(pfn) (mem_map + (pfn))
+#define pfn_to_page(pfn) (mem_map + (pfn) - mem_map_start_pfn)
will be used for virtual to physical address convertion. In my case I have
#define phys_to_pfn(x) (((x) - PHYS_START) >> PAGE_SHIFT) #define pa(x) ((x) - PAGE_OFFSET + PHYS_START)
and "pfn_to_page" stays untouch.
But I expect your solution easier to implement since as you said previously no arch
defines "phys_to_pfn".
Thanks
Franck.
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