Dave Hansen wrote:
The only arch with phys_to_pfn() defined is UML, so the patch simply
won't compile anything but UML on current kernels (unless I'm missing
something).
oops, I forgot to send the part of the patch that defines these macros,
sorry.
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.
If 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)
This is another solution indeed...But you will have to define another
constant which
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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