powerpc/mm: use _raw variant of page table accessors
This switch few of the page table accessor to use the __raw variant
and does the cpu to big endian conversion of constants. This helps in
generating better code.
For ex: a pgd_none(pgd) check with and without fix is listed below
Without fix:
------------
2240: 20 00 61 eb ld r27,32(r1)
/* PGD level */
typedef struct { __be64 pgd; } pgd_t;
static inline unsigned long pgd_val(pgd_t x)
{
return be64_to_cpu(x.pgd);
2244: 22 00 66 78 rldicl r6,r3,32,32
2248: 3e 40 7d 54 rotlwi r29,r3,8
224c: 0e c0 7d 50 rlwimi r29,r3,24,0,7
2250: 3e 40 c5 54 rotlwi r5,r6,8
2254: 2e c4 7d 50 rlwimi r29,r3,24,16,23
2258: 0e c0 c5 50 rlwimi r5,r6,24,0,7
225c: 2e c4 c5 50 rlwimi r5,r6,24,16,23
2260: c6 07 bd 7b rldicr r29,r29,32,31
2264: 78 2b bd 7f or r29,r29,r5
if (pgd_none(pgd))
2268: 00 00 bd 2f cmpdi cr7,r29,0
226c: 54 03 9e 41 beq cr7,25c0 <__get_user_pages_fast+0x500>
With fix:
---------
2370: 20 00 61 eb ld r27,32(r1)
if (pgd_none(pgd))
2374: 00 00 bd 2f cmpdi cr7,r29,0
2378: a8 03 9e 41 beq cr7,2720 <__get_user_pages_fast+0x530>
break;
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
66c570f545