Does slow_virt_to_phys() work with vmalloc() in the case of 32bit-PAE and 2MB page?

[Dexuan Cui <decui@microsoft.com>]

Hi all,
I suspect slow_virt_to_phys() may not work with vmalloc() in
the 32-bit PAE case(when the pa > 4GB), probably due to 2MB page(?)

Is there any known issue with slow_virt_to_phys() + vmalloc() +
32-bit PAE + 2MB page?

>From what I read the code of slow_virt_to_phys(), the variable 'psize' is
assigned with a value but not used at all -- is this a bug?


phys_addr_t slow_virt_to_phys(void *__virt_addr)
{
        unsigned long virt_addr = (unsigned long)__virt_addr;
        phys_addr_t phys_addr;
        unsigned long offset;
        enum pg_level level;
        unsigned long psize;
        unsigned long pmask;
        pte_t *pte;

        pte = lookup_address(virt_addr, &level);
        BUG_ON(!pte);
        psize = page_level_size(level);
        pmask = page_level_mask(level);
        offset = virt_addr & ~pmask;
        phys_addr = pte_pfn(*pte) << PAGE_SHIFT;
        return (phys_addr | offset);
}

Thanks,
-- Dexuan

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>