It is now possible to only build book3s/32 kernel for CPUs without hash table.
Opt out hash related code when CONFIG_PPC_BOOK3S_604 is not selected. Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu> --- arch/powerpc/kernel/head_book3s_32.S | 12 ++++++++++++ arch/powerpc/mm/book3s32/Makefile | 4 +++- 2 files changed, 15 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S index 620af1dda70c..4fc4091aaade 100644 --- a/arch/powerpc/kernel/head_book3s_32.S +++ b/arch/powerpc/kernel/head_book3s_32.S @@ -287,6 +287,7 @@ DataAccess: #ifdef CONFIG_VMAP_STACK mtspr SPRN_SPRG_SCRATCH0,r10 mfspr r10, SPRN_SPRG_THREAD +#ifdef CONFIG_PPC_BOOK3S_604 BEGIN_MMU_FTR_SECTION stw r11, THR11(r10) mfspr r10, SPRN_DSISR @@ -302,6 +303,7 @@ BEGIN_MMU_FTR_SECTION mtcr r11 lwz r11, THR11(r10) END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) +#endif mtspr SPRN_SPRG_SCRATCH1,r11 mfspr r11, SPRN_DAR stw r11, DAR(r10) @@ -319,6 +321,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) #else /* CONFIG_VMAP_STACK */ EXCEPTION_PROLOG handle_dar_dsisr=1 get_and_save_dar_dsisr_on_stack r4, r5, r11 +#ifdef CONFIG_PPC_BOOK3S_604 BEGIN_MMU_FTR_SECTION #ifdef CONFIG_PPC_KUAP andis. r0, r5, (DSISR_BAD_FAULT_32S | DSISR_DABRMATCH | DSISR_PROTFAULT)@h @@ -330,8 +333,11 @@ BEGIN_MMU_FTR_SECTION bl hash_page b handle_page_fault_tramp_1 FTR_SECTION_ELSE +#endif b handle_page_fault_tramp_2 +#ifdef CONFIG_PPC_BOOK3S_604 ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE) +#endif #endif /* CONFIG_VMAP_STACK */ /* Instruction access exception. */ @@ -347,12 +353,14 @@ InstructionAccess: mfspr r11, SPRN_SRR1 /* check whether user or kernel */ stw r11, SRR1(r10) mfcr r10 +#ifdef CONFIG_PPC_BOOK3S_604 BEGIN_MMU_FTR_SECTION andis. r11, r11, SRR1_ISI_NOPT@h /* no pte found? */ bne hash_page_isi .Lhash_page_isi_cont: mfspr r11, SPRN_SRR1 /* check whether user or kernel */ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) +#endif andi. r11, r11, MSR_PR EXCEPTION_PROLOG_1 @@ -363,9 +371,11 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) beq 1f /* if so, try to put a PTE */ li r3,0 /* into the hash table */ mr r4,r12 /* SRR0 is fault address */ +#ifdef CONFIG_PPC_BOOK3S_604 BEGIN_MMU_FTR_SECTION bl hash_page END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) +#endif #endif /* CONFIG_VMAP_STACK */ 1: mr r4,r12 andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */ @@ -703,6 +713,7 @@ handle_page_fault_tramp_2: EXC_XFER_LITE(0x300, handle_page_fault) #ifdef CONFIG_VMAP_STACK +#ifdef CONFIG_PPC_BOOK3S_604 .macro save_regs_thread thread stw r0, THR0(\thread) stw r3, THR3(\thread) @@ -774,6 +785,7 @@ fast_hash_page_return: mfspr r11, SPRN_SPRG_SCRATCH1 mfspr r10, SPRN_SPRG_SCRATCH0 RFI +#endif /* CONFIG_PPC_BOOK3S_604 */ stack_overflow: vmap_stack_overflow_exception diff --git a/arch/powerpc/mm/book3s32/Makefile b/arch/powerpc/mm/book3s32/Makefile index 3f972db17761..446d9de88ce4 100644 --- a/arch/powerpc/mm/book3s32/Makefile +++ b/arch/powerpc/mm/book3s32/Makefile @@ -6,4 +6,6 @@ ifdef CONFIG_KASAN CFLAGS_mmu.o += -DDISABLE_BRANCH_PROFILING endif -obj-y += mmu.o hash_low.o mmu_context.o tlb.o nohash_low.o +obj-y += mmu.o mmu_context.o +obj-$(CONFIG_PPC_BOOK3S_603) += nohash_low.o +obj-$(CONFIG_PPC_BOOK3S_604) += hash_low.o tlb.o -- 2.25.0