powerpc/syscall: Make interrupt.c buildable on PPC32

To allow building interrupt.c on PPC32, ifdef out specific PPC64
code or use helpers which are available on both PP32 and PPC64

Modify Makefile to always build interrupt.o

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ba073ad67bd971a88ce331b65d6655523b54c794.1612796617.git.christophe.leroy@csgroup.eu

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index b7a8227..9c4d75a 100644 (file)
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -46,10 +46,10 @@ obj-y                               := cputable.o syscalls.o \
                                   prom.o traps.o setup-common.o \
                                   udbg.o misc.o io.o misc_$(BITS).o \
                                   of_platform.o prom_parse.o firmware.o \
-                                  hw_breakpoint_constraints.o
+                                  hw_breakpoint_constraints.o interrupt.o
 obj-y                          += ptrace/
 obj-$(CONFIG_PPC64)            += setup_64.o \
-                                  paca.o nvram_64.o note.o interrupt.o
+                                  paca.o nvram_64.o note.o
 obj-$(CONFIG_COMPAT)           += sys_ppc32.o signal_32.o
 obj-$(CONFIG_VDSO32)           += vdso32/
 obj-$(CONFIG_PPC_WATCHDOG)     += watchdog.o

diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
index d6be4f9..2dac4d2 100644 (file)
--- a/arch/powerpc/kernel/interrupt.c
+++ b/arch/powerpc/kernel/interrupt.c
@@ -39,7 +39,7 @@ notrace long system_call_exception(long r3, long r4, long r5,
                BUG_ON(!(regs->msr & MSR_RI));
        BUG_ON(!(regs->msr & MSR_PR));
        BUG_ON(!FULL_REGS(regs));
-       BUG_ON(regs->softe != IRQS_ENABLED);
+       BUG_ON(arch_irq_disabled_regs(regs));
 
 #ifdef CONFIG_PPC_PKEY
        if (mmu_has_feature(MMU_FTR_PKEY)) {
@@ -65,7 +65,9 @@ notrace long system_call_exception(long r3, long r4, long r5,
                        isync();
        } else
 #endif
+#ifdef CONFIG_PPC64
                kuap_check_amr();
+#endif
 
        account_cpu_user_entry();
 
@@ -77,7 +79,7 @@ notrace long system_call_exception(long r3, long r4, long r5,
         * frame, or if the unwinder was taught the first stack frame always
         * returns to user with IRQS_ENABLED, this store could be avoided!
         */
-       regs->softe = IRQS_ENABLED;
+       irq_soft_mask_regs_set_state(regs, IRQS_ENABLED);
 
        local_irq_enable();
 
@@ -151,6 +153,7 @@ static notrace inline bool __prep_irq_for_enabled_exit(bool clear_ri)
                __hard_EE_RI_disable();
        else
                __hard_irq_disable();
+#ifdef CONFIG_PPC64
        if (unlikely(lazy_irq_pending_nocheck())) {
                /* Took an interrupt, may have more exit work to do. */
                if (clear_ri)
@@ -162,7 +165,7 @@ static notrace inline bool __prep_irq_for_enabled_exit(bool clear_ri)
        }
        local_paca->irq_happened = 0;
        irq_soft_mask_set(IRQS_ENABLED);
-
+#endif
        return true;
 }
 
@@ -216,7 +219,9 @@ notrace unsigned long syscall_exit_prepare(unsigned long r3,
 
        CT_WARN_ON(ct_state() == CONTEXT_USER);
 
+#ifdef CONFIG_PPC64
        kuap_check_amr();
+#endif
 
        regs->result = r3;
 
@@ -309,7 +314,7 @@ again:
 
        account_cpu_user_exit();
 
-#ifdef CONFIG_PPC_BOOK3S /* BOOK3E not yet using this */
+#ifdef CONFIG_PPC_BOOK3S_64 /* BOOK3E and ppc32 not using this */
        /*
         * We do this at the end so that we do context switch with KERNEL AMR
         */
@@ -318,7 +323,7 @@ again:
        return ret;
 }
 
-#ifdef CONFIG_PPC_BOOK3S /* BOOK3E not yet using this */
+#ifndef CONFIG_PPC_BOOK3E_64 /* BOOK3E not yet using this */
 notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs, unsigned long msr)
 {
 #ifdef CONFIG_PPC_BOOK3E
@@ -333,14 +338,16 @@ notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs, unsigned
                BUG_ON(!(regs->msr & MSR_RI));
        BUG_ON(!(regs->msr & MSR_PR));
        BUG_ON(!FULL_REGS(regs));
-       BUG_ON(regs->softe != IRQS_ENABLED);
+       BUG_ON(arch_irq_disabled_regs(regs));
        CT_WARN_ON(ct_state() == CONTEXT_USER);
 
        /*
         * We don't need to restore AMR on the way back to userspace for KUAP.
         * AMR can only have been unlocked if we interrupted the kernel.
         */
+#ifdef CONFIG_PPC64
        kuap_check_amr();
+#endif
 
        local_irq_save(flags);
 
@@ -407,7 +414,9 @@ again:
        /*
         * We do this at the end so that we do context switch with KERNEL AMR
         */
+#ifdef CONFIG_PPC64
        kuap_user_restore(regs);
+#endif
        return ret;
 }
 
@@ -419,7 +428,9 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign
        unsigned long *ti_flagsp = &current_thread_info()->flags;
        unsigned long flags;
        unsigned long ret = 0;
+#ifdef CONFIG_PPC64
        unsigned long amr;
+#endif
 
        if (IS_ENABLED(CONFIG_PPC_BOOK3S) && unlikely(!(regs->msr & MSR_RI)))
                unrecoverable_exception(regs);
@@ -432,7 +443,9 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign
        if (TRAP(regs) != 0x700)
                CT_WARN_ON(ct_state() == CONTEXT_USER);
 
+#ifdef CONFIG_PPC64
        amr = kuap_get_and_check_amr();
+#endif
 
        if (unlikely(*ti_flagsp & _TIF_EMULATE_STACK_STORE)) {
                clear_bits(_TIF_EMULATE_STACK_STORE, ti_flagsp);
@@ -441,7 +454,7 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign
 
        local_irq_save(flags);
 
-       if (regs->softe == IRQS_ENABLED) {
+       if (!arch_irq_disabled_regs(regs)) {
                /* Returning to a kernel context with local irqs enabled. */
                WARN_ON_ONCE(!(regs->msr & MSR_EE));
 again:
@@ -458,8 +471,10 @@ again:
        } else {
                /* Returning to a kernel context with local irqs disabled. */
                __hard_EE_RI_disable();
+#ifdef CONFIG_PPC64
                if (regs->msr & MSR_EE)
                        local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS;
+#endif
        }
 
 
@@ -472,7 +487,9 @@ again:
         * which would cause Read-After-Write stalls. Hence, we take the AMR
         * value from the check above.
         */
+#ifdef CONFIG_PPC64
        kuap_kernel_restore(regs, amr);
+#endif
 
        return ret;
 }