Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull more arm64 updates from Catalin Marinas:
 "A mix of fixes and clean-ups that turned up too late for the first
  pull request:

   - Restore terminal stack frame records. Their previous removal caused
     traces which cross secondary_start_kernel to terminate one entry
     too late, with a spurious "0" entry.

   - Fix boot warning with pseudo-NMI due to the way we manipulate the
     PMR register.

   - ACPI fixes: avoid corruption of interrupt mappings on watchdog
     probe failure (GTDT), prevent unregistering of GIC SGIs.

   - Force SPARSEMEM_VMEMMAP as the only memory model, it saves with
     having to test all the other combinations.

   - Documentation fixes and updates: tagged address ABI exceptions on
     brk/mmap/mremap(), event stream frequency, update booting
     requirements on the configuration of traps"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: kernel: Update the stale comment
  arm64: Fix the documented event stream frequency
  arm64: entry: always set GIC_PRIO_PSR_I_SET during entry
  arm64: Explicitly document boot requirements for SVE
  arm64: Explicitly require that FPSIMD instructions do not trap
  arm64: Relax booting requirements for configuration of traps
  arm64: cpufeatures: use min and max
  arm64: stacktrace: restore terminal records
  arm64/vdso: Discard .note.gnu.property sections in vDSO
  arm64: doc: Add brk/mmap/mremap() to the Tagged Address ABI Exceptions
  psci: Remove unneeded semicolon
  ACPI: irq: Prevent unregistering of GIC SGIs
  ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure
  arm64: Show three registers per line
  arm64: remove HAVE_DEBUG_BUGVERBOSE
  arm64: alternative: simplify passing alt_region
  arm64: Force SPARSEMEM_VMEMMAP as the only memory management model
  arm64: vdso32: drop -no-integrated-as flag

9 files changed, 27 insertions, 58 deletions

diff --git a/arch/arm64/kernel/alternative.c b/arch/arm64/kernel/alternative.c
index abc84636af07..c906d20c7b52 100644
--- a/arch/arm64/kernel/alternative.c
+++ b/arch/arm64/kernel/alternative.c
@@ -133,11 +133,10 @@ static void clean_dcache_range_nopatch(u64 start, u64 end)
 	} while (cur += d_size, cur < end);
 }
 
-static void __nocfi __apply_alternatives(void *alt_region,  bool is_module,
-					 unsigned long *feature_mask)
+static void __nocfi __apply_alternatives(struct alt_region *region, bool is_module,
+				 unsigned long *feature_mask)
 {
 	struct alt_instr *alt;
-	struct alt_region *region = alt_region;
 	__le32 *origptr, *updptr;
 	alternative_cb_t alt_cb;
 
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 30c82d38c189..efed2830d141 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -68,6 +68,7 @@
 #include <linux/sort.h>
 #include <linux/stop_machine.h>
 #include <linux/types.h>
+#include <linux/minmax.h>
 #include <linux/mm.h>
 #include <linux/cpu.h>
 #include <linux/kasan.h>
@@ -694,14 +695,14 @@ static s64 arm64_ftr_safe_value(const struct arm64_ftr_bits *ftrp, s64 new,
 		ret = ftrp->safe_val;
 		break;
 	case FTR_LOWER_SAFE:
-		ret = new < cur ? new : cur;
+		ret = min(new, cur);
 		break;
 	case FTR_HIGHER_OR_ZERO_SAFE:
 		if (!cur || !new)
 			break;
 		fallthrough;
 	case FTR_HIGHER_SAFE:
-		ret = new > cur ? new : cur;
+		ret = max(new, cur);
 		break;
 	default:
 		BUG();
diff --git a/arch/arm64/kernel/cpuidle.c b/arch/arm64/kernel/cpuidle.c
index b512b5503f6e..03991eeff643 100644
--- a/arch/arm64/kernel/cpuidle.c
+++ b/arch/arm64/kernel/cpuidle.c
@@ -29,7 +29,7 @@ int arm_cpuidle_init(unsigned int cpu)
 
 /**
  * arm_cpuidle_suspend() - function to enter a low-power idle state
- * @arg: argument to pass to CPU suspend operations
+ * @index: argument to pass to CPU suspend operations
  *
  * Return: 0 on success, -EOPNOTSUPP if CPU suspend hook not initialized, CPU
  * operations back-end error code otherwise.
diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c
index a1ec351c36bd..340d04e13617 100644
--- a/arch/arm64/kernel/entry-common.c
+++ b/arch/arm64/kernel/entry-common.c
@@ -230,14 +230,6 @@ static void noinstr el1_dbg(struct pt_regs *regs, unsigned long esr)
 {
 	unsigned long far = read_sysreg(far_el1);
 
-	/*
-	 * The CPU masked interrupts, and we are leaving them masked during
-	 * do_debug_exception(). Update PMR as if we had called
-	 * local_daif_mask().
-	 */
-	if (system_uses_irq_prio_masking())
-		gic_write_pmr(GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET);
-
 	arm64_enter_el1_dbg(regs);
 	if (!cortex_a76_erratum_1463225_debug_handler(regs))
 		do_debug_exception(far, esr, regs);
@@ -404,9 +396,6 @@ static void noinstr el0_dbg(struct pt_regs *regs, unsigned long esr)
 	/* Only watchpoints write FAR_EL1, otherwise its UNKNOWN */
 	unsigned long far = read_sysreg(far_el1);
 
-	if (system_uses_irq_prio_masking())
-		gic_write_pmr(GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET);
-
 	enter_from_user_mode();
 	do_debug_exception(far, esr, regs);
 	local_daif_restore(DAIF_PROCCTX_NOIRQ);
@@ -414,9 +403,6 @@ static void noinstr el0_dbg(struct pt_regs *regs, unsigned long esr)
 
 static void noinstr el0_svc(struct pt_regs *regs)
 {
-	if (system_uses_irq_prio_masking())
-		gic_write_pmr(GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET);
-
 	enter_from_user_mode();
 	cortex_a76_erratum_1463225_svc_handler();
 	do_el0_svc(regs);
@@ -492,9 +478,6 @@ static void noinstr el0_cp15(struct pt_regs *regs, unsigned long esr)
 
 static void noinstr el0_svc_compat(struct pt_regs *regs)
 {
-	if (system_uses_irq_prio_masking())
-		gic_write_pmr(GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET);
-
 	enter_from_user_mode();
 	cortex_a76_erratum_1463225_svc_handler();
 	do_el0_svc_compat(regs);
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 4ac5455c0ead..3513984a88bd 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -285,16 +285,16 @@ alternative_else_nop_endif
 	stp	lr, x21, [sp, #S_LR]
 
 	/*
-	 * For exceptions from EL0, terminate the callchain here.
+	 * For exceptions from EL0, create a terminal frame record.
 	 * For exceptions from EL1, create a synthetic frame record so the
 	 * interrupted code shows up in the backtrace.
 	 */
 	.if \el == 0
-	mov	x29, xzr
+	stp	xzr, xzr, [sp, #S_STACKFRAME]
 	.else
 	stp	x29, x22, [sp, #S_STACKFRAME]
-	add	x29, sp, #S_STACKFRAME
 	.endif
+	add	x29, sp, #S_STACKFRAME
 
 #ifdef CONFIG_ARM64_SW_TTBR0_PAN
 alternative_if_not ARM64_HAS_PAN
@@ -314,6 +314,8 @@ alternative_else_nop_endif
 alternative_if ARM64_HAS_IRQ_PRIO_MASKING
 	mrs_s	x20, SYS_ICC_PMR_EL1
 	str	x20, [sp, #S_PMR_SAVE]
+	mov	x20, #GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET
+	msr_s	SYS_ICC_PMR_EL1, x20
 alternative_else_nop_endif
 
 	/* Re-enable tag checking (TCO set on exception entry) */
@@ -550,17 +552,7 @@ tsk	.req	x28		// current thread_info
 #endif
 	.endm
 
-	.macro	gic_prio_irq_setup, pmr:req, tmp:req
-#ifdef CONFIG_ARM64_PSEUDO_NMI
-	alternative_if ARM64_HAS_IRQ_PRIO_MASKING
-	orr	\tmp, \pmr, #GIC_PRIO_PSR_I_SET
-	msr_s	SYS_ICC_PMR_EL1, \tmp
-	alternative_else_nop_endif
-#endif
-	.endm
-
 	.macro el1_interrupt_handler, handler:req
-	gic_prio_irq_setup pmr=x20, tmp=x1
 	enable_da
 
 	mov	x0, sp
@@ -590,7 +582,6 @@ alternative_else_nop_endif
 	.endm
 
 	.macro el0_interrupt_handler, handler:req
-	gic_prio_irq_setup pmr=x20, tmp=x0
 	user_exit_irqoff
 	enable_da
 
@@ -788,7 +779,6 @@ SYM_CODE_END(el0_fiq)
 SYM_CODE_START_LOCAL(el1_error)
 	kernel_entry 1
 	mrs	x1, esr_el1
-	gic_prio_kentry_setup tmp=x2
 	enable_dbg
 	mov	x0, sp
 	bl	do_serror
@@ -799,7 +789,6 @@ SYM_CODE_START_LOCAL(el0_error)
 	kernel_entry 0
 el0_error_naked:
 	mrs	x25, esr_el1
-	gic_prio_kentry_setup tmp=x2
 	user_exit_irqoff
 	enable_dbg
 	mov	x0, sp
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index cbf52109583b..b4bb67f17a2c 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -294,13 +294,10 @@ void __show_regs(struct pt_regs *regs)
 	i = top_reg;
 
 	while (i >= 0) {
-		printk("x%-2d: %016llx ", i, regs->regs[i]);
-		i--;
+		printk("x%-2d: %016llx", i, regs->regs[i]);
 
-		if (i % 2 == 0) {
-			pr_cont("x%-2d: %016llx ", i, regs->regs[i]);
-			i--;
-		}
+		while (i-- % 3)
+			pr_cont(" x%-2d: %016llx", i, regs->regs[i]);
 
 		pr_cont("\n");
 	}
diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index 84b676bcf867..de07147a7926 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -68,10 +68,6 @@ int notrace unwind_frame(struct task_struct *tsk, struct stackframe *frame)
 	unsigned long fp = frame->fp;
 	struct stack_info info;
 
-	/* Terminal record; nothing to unwind */
-	if (!fp)
-		return -ENOENT;
-
 	if (fp & 0xf)
 		return -EINVAL;
 
@@ -132,6 +128,12 @@ int notrace unwind_frame(struct task_struct *tsk, struct stackframe *frame)
 
 	frame->pc = ptrauth_strip_insn_pac(frame->pc);
 
+	/*
+	 * This is a terminal record, so we have finished unwinding.
+	 */
+	if (!frame->fp && !frame->pc)
+		return -ENOENT;
+
 	return 0;
 }
 NOKPROBE_SYMBOL(unwind_frame);
diff --git a/arch/arm64/kernel/vdso/vdso.lds.S b/arch/arm64/kernel/vdso/vdso.lds.S
index 61dbb4c838ef..a5e61e09ea92 100644
--- a/arch/arm64/kernel/vdso/vdso.lds.S
+++ b/arch/arm64/kernel/vdso/vdso.lds.S
@@ -31,6 +31,13 @@ SECTIONS
 	.gnu.version_d	: { *(.gnu.version_d) }
 	.gnu.version_r	: { *(.gnu.version_r) }
 
+	/*
+	 * Discard .note.gnu.property sections which are unused and have
+	 * different alignment requirement from vDSO note sections.
+	 */
+	/DISCARD/	: {
+		*(.note.GNU-stack .note.gnu.property)
+	}
 	.note		: { *(.note.*) }		:text	:note
 
 	. = ALIGN(16);
@@ -48,7 +55,6 @@ SECTIONS
 	PROVIDE(end = .);
 
 	/DISCARD/	: {
-		*(.note.GNU-stack)
 		*(.data .data.* .gnu.linkonce.d.* .sdata*)
 		*(.bss .sbss .dynbss .dynsbss)
 		*(.eh_frame .eh_frame_hdr)
diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
index 789ad420f16b..3dba0c4f8f42 100644
--- a/arch/arm64/kernel/vdso32/Makefile
+++ b/arch/arm64/kernel/vdso32/Makefile
@@ -10,15 +10,7 @@ include $(srctree)/lib/vdso/Makefile
 
 # Same as cc-*option, but using CC_COMPAT instead of CC
 ifeq ($(CONFIG_CC_IS_CLANG), y)
-COMPAT_GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE_COMPAT)elfedit))
-COMPAT_GCC_TOOLCHAIN := $(realpath $(COMPAT_GCC_TOOLCHAIN_DIR)/..)
-
 CC_COMPAT_CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE_COMPAT:%-=%))
-CC_COMPAT_CLANG_FLAGS += --prefix=$(COMPAT_GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE_COMPAT))
-CC_COMPAT_CLANG_FLAGS += -no-integrated-as -Qunused-arguments
-ifneq ($(COMPAT_GCC_TOOLCHAIN),)
-CC_COMPAT_CLANG_FLAGS += --gcc-toolchain=$(COMPAT_GCC_TOOLCHAIN)
-endif
 
 CC_COMPAT ?= $(CC)
 CC_COMPAT += $(CC_COMPAT_CLANG_FLAGS)