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powerpc: Make vmalloc_to_phys() public

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This makes vmalloc_to_phys() public as there will be another user
(KVM in-kernel VFIO acceleration) for it soon. As this new user
can be compiled as a module, this exports the symbol.

As a little optimization, this changes the helper to call
vmalloc_to_pfn() instead of vmalloc_to_page() as the size of the
struct page may not be power-of-two aligned which will make gcc use
multiply instructions instead of shifts.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Alexey Kardashevskiy 2016-02-15 12:55:03 +11:00 • committed by Paul Mackerras
parent 178a787502
commit e9ab1a1caf
3 changed files with 11 additions and 8 deletions
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3
arch/powerpc/include/asm/pgtable.h
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@ -78,6 +78,9 @@ static inline pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
}
return __find_linux_pte_or_hugepte(pgdir, ea, is_thp, shift);
}
unsigned long vmalloc_to_phys(void *vmalloc_addr);
#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_PGTABLE_H */