powerpc/mm/radix: Add MMU_FTR_RADIX
We are going to add asm changes in the follow up patches. Add the
feature bit now so that we can get it all build.
mpe: When CONFIG_PPC_RADIX_MMU=n we omit MMU_FTR_RADIX from the
MMU_FTRS_POSSIBLE mask. This allows the compiler to work out that those
checks will always be false and so the code can be elided completely.
Note we do *not* define MMU_FTR_RADIX to 0 in the RADIX_MMU=n case,
because that doesn't work with the ASM_FTR patching. In particular an
IF_SET section will result in a mask and value of zero, which is always
true, meaning the section *won't* be patched, which is the opposite of
what we want.
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>
diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
index fbd6f35..e53ebeb 100644
--- a/arch/powerpc/include/asm/mmu.h
+++ b/arch/powerpc/include/asm/mmu.h
@@ -88,6 +88,11 @@
*/
#define MMU_FTR_1T_SEGMENT ASM_CONST(0x40000000)
+/*
+ * Radix page table available
+ */
+#define MMU_FTR_RADIX ASM_CONST(0x80000000)
+
/* MMU feature bit sets for various CPUs */
#define MMU_FTRS_DEFAULT_HPTE_ARCH_V2 \
MMU_FTR_HPTE_TABLE | MMU_FTR_PPCAS_ARCH_V2
@@ -119,7 +124,11 @@
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,
+ MMU_FTR_1T_SEGMENT |
+#ifdef CONFIG_PPC_RADIX_MMU
+ MMU_FTR_RADIX |
+#endif
+ 0,
};
static inline int mmu_has_feature(unsigned long feature)