On 10/11/22 23:55, Sourabh Jain wrote:
If kmap_local_page() works for all archs, then I'm happy to drop these
arch_ variants and use it directly.
Yes, pls do.
I'll check with Sourabh to see if PPC can work with kmap_local_page().
I think kmap_local_page do support on PowerPC. But can you explain why we need this
function here, aren't the reserve memory already available to use?
On x86, attempts to access the elfcorehdr without mapping it did not work (resulted
in a fault).
Let me know if using kmap_local_page() in place of __va() in arch_map_crash_pages().
If it does, then I can eliminate arch_un/map_crash_pages() and use kmap_local_page()
directly.
Hello Eric,
Atleast on ppc64 we have direct mapping available and hence just by doing page shift
on physical address (__va) we can get valid virtual address on powerpc. In short we don't
have to generate mapping again to access reserved region.
Regardless let's go with kdump_local_page API, it is supported on powerpc.
Thanks,
Sourabh Jain
Ok, I will go that route.
Thanks!
eric
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