forked from Minki/linux
66c570f545
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> |
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uapi/asm |