Subject: [PATCH 2/2] arm64: add KASan support

From: [email-masked] (David Keitel)
Date: Tue, 14 Apr 2015 19:37:13 -0700

>>> +	pgd = __pgd(__pa(kasan_zero_pmd) | PAGE_KERNEL);
>>> +#else
>>> +	pgd = __pgd(__pa(kasan_zero_pte) | PAGE_KERNEL);
>>> +#endif
>>> +
>>> +	for (i = pgd_index(start); start < end; i++) {
>>> +		set_pgd(&pgdp[i], pgd);
>>> +		start += PGDIR_SIZE;
>>> +	}
>>> +}
>>
>> Same problem as above with PAGE_KERNEL. You should just use
>> pgd_populate().

Any suggestion what the correct flag setting would be here for a 4K mapping?

I tried fixing this by changing this to pud and setting the PMD_TYPE_TABLE flag for kasan_zero_pmd. However the MMU doesn't like it and I get a first level address translation fault.

If you have any updated patches to share I'd be glad to try them out.

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