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Commit 773edead authored by Michael Ellerman's avatar Michael Ellerman
Browse files

powerpc/mm: Add mask of possible MMU features 



Follow the example of the cpu feature code, and add a mask of possible
MMU features, MMU_FTRS_POSSIBLE.

This is used in mmu_has_feature(), which allows the possible mask to act
as a shortcut for any features that are not possible, but still allows
the feature bit itself to be defined.

We will use this in the next commit to allow MMU_FTR_RADIX checks to be
elided when MMU_FTR_RADIX is not possible.

Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 1a472c9d

arch/powerpc/include/asm/mmu.h

+13 −1
Original line number Diff line number Diff line
@@ -110,9 +110,21 @@ 
DECLARE_PER_CPU(int, next_tlbcam_idx);

#endif



enum {

	MMU_FTRS_POSSIBLE = MMU_FTR_HPTE_TABLE | MMU_FTR_TYPE_8xx |

		MMU_FTR_TYPE_40x | MMU_FTR_TYPE_44x | MMU_FTR_TYPE_FSL_E |

		MMU_FTR_TYPE_47x | MMU_FTR_USE_HIGH_BATS | MMU_FTR_BIG_PHYS |

		MMU_FTR_USE_TLBIVAX_BCAST | MMU_FTR_USE_TLBILX |

		MMU_FTR_LOCK_BCAST_INVAL | MMU_FTR_NEED_DTLB_SW_LRU |

		MMU_FTR_USE_TLBRSRV | MMU_FTR_USE_PAIRED_MAS |

		MMU_FTR_NO_SLBIE_B | MMU_FTR_16M_PAGE | MMU_FTR_TLBIEL |

		MMU_FTR_LOCKLESS_TLBIE | MMU_FTR_CI_LARGE_PAGE |

		MMU_FTR_1T_SEGMENT,

};



static inline int mmu_has_feature(unsigned long feature)

{

	return (cur_cpu_spec->mmu_features & feature);

	return (MMU_FTRS_POSSIBLE & cur_cpu_spec->mmu_features & feature);

}



static inline void mmu_clear_feature(unsigned long feature)