treewide: Use fallthrough pseudo-keyword

Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

10 files changed, 51 insertions, 51 deletions

diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index 455966401102..a85174d05473 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -322,7 +322,7 @@ void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
 			 */
 			if (memblock_is_map_memory(phys))
 				return (void __iomem *)__phys_to_virt(phys);
-			/* fall through */
+			fallthrough;
 
 		default:
 			if (region->attribute & EFI_MEMORY_WB)
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index a389b999482e..6424584be01e 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -686,7 +686,7 @@ static s64 arm64_ftr_safe_value(const struct arm64_ftr_bits *ftrp, s64 new,
 	case FTR_HIGHER_OR_ZERO_SAFE:
 		if (!cur || !new)
 			break;
-		/* Fallthrough */
+		fallthrough;
 	case FTR_HIGHER_SAFE:
 		ret = new > cur ? new : cur;
 		break;
diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index 393c6fb1f1cb..1886a02c3f50 100644
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -327,7 +327,7 @@ static void cpuinfo_detect_icache_policy(struct cpuinfo_arm64 *info)
 		set_bit(ICACHEF_VPIPT, &__icache_flags);
 		break;
 	default:
-		/* Fallthrough */
+		fallthrough;
 	case ICACHE_POLICY_VIPT:
 		/* Assume aliasing */
 		set_bit(ICACHEF_ALIASING, &__icache_flags);
diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c
index af234a1e08b7..712e97c03e54 100644
--- a/arch/arm64/kernel/hw_breakpoint.c
+++ b/arch/arm64/kernel/hw_breakpoint.c
@@ -257,7 +257,7 @@ static int hw_breakpoint_control(struct perf_event *bp,
 		 * level.
 		 */
 		enable_debug_monitors(dbg_el);
-		/* Fall through */
+		fallthrough;
 	case HW_BREAKPOINT_RESTORE:
 		/* Setup the address register. */
 		write_wb_reg(val_reg, i, info->address);
@@ -541,13 +541,13 @@ int hw_breakpoint_arch_parse(struct perf_event *bp,
 			if (hw->ctrl.len == ARM_BREAKPOINT_LEN_2)
 				break;
 
-			/* Fallthrough */
+			fallthrough;
 		case 3:
 			/* Allow single byte watchpoint. */
 			if (hw->ctrl.len == ARM_BREAKPOINT_LEN_1)
 				break;
 
-			/* Fallthrough */
+			fallthrough;
 		default:
 			return -EINVAL;
 		}
diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c
index 1cd1a4d0ed30..2a1ad95d9b2c 100644
--- a/arch/arm64/kernel/module.c
+++ b/arch/arm64/kernel/module.c
@@ -315,21 +315,21 @@ int apply_relocate_add(Elf64_Shdr *sechdrs,
 		/* MOVW instruction relocations. */
 		case R_AARCH64_MOVW_UABS_G0_NC:
 			overflow_check = false;
-			/* Fall through */
+			fallthrough;
 		case R_AARCH64_MOVW_UABS_G0:
 			ovf = reloc_insn_movw(RELOC_OP_ABS, loc, val, 0,
 					      AARCH64_INSN_IMM_MOVKZ);
 			break;
 		case R_AARCH64_MOVW_UABS_G1_NC:
 			overflow_check = false;
-			/* Fall through */
+			fallthrough;
 		case R_AARCH64_MOVW_UABS_G1:
 			ovf = reloc_insn_movw(RELOC_OP_ABS, loc, val, 16,
 					      AARCH64_INSN_IMM_MOVKZ);
 			break;
 		case R_AARCH64_MOVW_UABS_G2_NC:
 			overflow_check = false;
-			/* Fall through */
+			fallthrough;
 		case R_AARCH64_MOVW_UABS_G2:
 			ovf = reloc_insn_movw(RELOC_OP_ABS, loc, val, 32,
 					      AARCH64_INSN_IMM_MOVKZ);
@@ -397,7 +397,7 @@ int apply_relocate_add(Elf64_Shdr *sechdrs,
 			break;
 		case R_AARCH64_ADR_PREL_PG_HI21_NC:
 			overflow_check = false;
-			/* Fall through */
+			fallthrough;
 		case R_AARCH64_ADR_PREL_PG_HI21:
 			ovf = reloc_insn_adrp(me, sechdrs, loc, val);
 			if (ovf && ovf != -ERANGE)
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 03957a1ae6c0..355ee9eed4dd 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -151,7 +151,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
 			break;
 		}
 		pr_crit("CPU%u: may not have shut down cleanly\n", cpu);
-		/* Fall through */
+		fallthrough;
 	case CPU_STUCK_IN_KERNEL:
 		pr_crit("CPU%u: is stuck in kernel\n", cpu);
 		if (status & CPU_STUCK_REASON_52_BIT_VA)
diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c
index fe6c7d79309d..5d690d60ccad 100644
--- a/arch/arm64/kvm/handle_exit.c
+++ b/arch/arm64/kvm/handle_exit.c
@@ -128,7 +128,7 @@ static int kvm_handle_guest_debug(struct kvm_vcpu *vcpu)
 	switch (ESR_ELx_EC(esr)) {
 	case ESR_ELx_EC_WATCHPT_LOW:
 		run->debug.arch.far = vcpu->arch.fault.far_el2;
-		/* fall through */
+		fallthrough;
 	case ESR_ELx_EC_SOFTSTP_LOW:
 	case ESR_ELx_EC_BREAKPT_LOW:
 	case ESR_ELx_EC_BKPT32:
diff --git a/arch/arm64/kvm/hyp/include/hyp/debug-sr.h b/arch/arm64/kvm/hyp/include/hyp/debug-sr.h
index 0297dc63988c..5e28ea6aa097 100644
--- a/arch/arm64/kvm/hyp/include/hyp/debug-sr.h
+++ b/arch/arm64/kvm/hyp/include/hyp/debug-sr.h
@@ -21,70 +21,70 @@
 #define save_debug(ptr,reg,nr)						\
 	switch (nr) {							\
 	case 15:	ptr[15] = read_debug(reg, 15);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 14:	ptr[14] = read_debug(reg, 14);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 13:	ptr[13] = read_debug(reg, 13);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 12:	ptr[12] = read_debug(reg, 12);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 11:	ptr[11] = read_debug(reg, 11);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 10:	ptr[10] = read_debug(reg, 10);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 9:		ptr[9] = read_debug(reg, 9);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 8:		ptr[8] = read_debug(reg, 8);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 7:		ptr[7] = read_debug(reg, 7);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 6:		ptr[6] = read_debug(reg, 6);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 5:		ptr[5] = read_debug(reg, 5);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 4:		ptr[4] = read_debug(reg, 4);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 3:		ptr[3] = read_debug(reg, 3);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 2:		ptr[2] = read_debug(reg, 2);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 1:		ptr[1] = read_debug(reg, 1);			\
-			/* Fall through */				\
+			fallthrough;					\
 	default:	ptr[0] = read_debug(reg, 0);			\
 	}
 
 #define restore_debug(ptr,reg,nr)					\
 	switch (nr) {							\
 	case 15:	write_debug(ptr[15], reg, 15);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 14:	write_debug(ptr[14], reg, 14);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 13:	write_debug(ptr[13], reg, 13);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 12:	write_debug(ptr[12], reg, 12);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 11:	write_debug(ptr[11], reg, 11);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 10:	write_debug(ptr[10], reg, 10);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 9:		write_debug(ptr[9], reg, 9);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 8:		write_debug(ptr[8], reg, 8);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 7:		write_debug(ptr[7], reg, 7);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 6:		write_debug(ptr[6], reg, 6);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 5:		write_debug(ptr[5], reg, 5);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 4:		write_debug(ptr[4], reg, 4);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 3:		write_debug(ptr[3], reg, 3);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 2:		write_debug(ptr[2], reg, 2);			\
-			/* Fall through */				\
+			fallthrough;					\
 	case 1:		write_debug(ptr[1], reg, 1);			\
-			/* Fall through */				\
+			fallthrough;					\
 	default:	write_debug(ptr[0], reg, 0);			\
 	}
 
diff --git a/arch/arm64/kvm/hyp/vgic-v3-sr.c b/arch/arm64/kvm/hyp/vgic-v3-sr.c
index 5a0073511efb..452f4cacd674 100644
--- a/arch/arm64/kvm/hyp/vgic-v3-sr.c
+++ b/arch/arm64/kvm/hyp/vgic-v3-sr.c
@@ -340,10 +340,10 @@ void __vgic_v3_save_aprs(struct vgic_v3_cpu_if *cpu_if)
 	case 7:
 		cpu_if->vgic_ap0r[3] = __vgic_v3_read_ap0rn(3);
 		cpu_if->vgic_ap0r[2] = __vgic_v3_read_ap0rn(2);
-		/* Fall through */
+		fallthrough;
 	case 6:
 		cpu_if->vgic_ap0r[1] = __vgic_v3_read_ap0rn(1);
-		/* Fall through */
+		fallthrough;
 	default:
 		cpu_if->vgic_ap0r[0] = __vgic_v3_read_ap0rn(0);
 	}
@@ -352,10 +352,10 @@ void __vgic_v3_save_aprs(struct vgic_v3_cpu_if *cpu_if)
 	case 7:
 		cpu_if->vgic_ap1r[3] = __vgic_v3_read_ap1rn(3);
 		cpu_if->vgic_ap1r[2] = __vgic_v3_read_ap1rn(2);
-		/* Fall through */
+		fallthrough;
 	case 6:
 		cpu_if->vgic_ap1r[1] = __vgic_v3_read_ap1rn(1);
-		/* Fall through */
+		fallthrough;
 	default:
 		cpu_if->vgic_ap1r[0] = __vgic_v3_read_ap1rn(0);
 	}
@@ -373,10 +373,10 @@ void __vgic_v3_restore_aprs(struct vgic_v3_cpu_if *cpu_if)
 	case 7:
 		__vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[3], 3);
 		__vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[2], 2);
-		/* Fall through */
+		fallthrough;
 	case 6:
 		__vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[1], 1);
-		/* Fall through */
+		fallthrough;
 	default:
 		__vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[0], 0);
 	}
@@ -385,10 +385,10 @@ void __vgic_v3_restore_aprs(struct vgic_v3_cpu_if *cpu_if)
 	case 7:
 		__vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[3], 3);
 		__vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[2], 2);
-		/* Fall through */
+		fallthrough;
 	case 6:
 		__vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[1], 1);
-		/* Fall through */
+		fallthrough;
 	default:
 		__vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[0], 0);
 	}
diff --git a/arch/arm64/mm/context.c b/arch/arm64/mm/context.c
index a206655a39a5..9b11c096a042 100644
--- a/arch/arm64/mm/context.c
+++ b/arch/arm64/mm/context.c
@@ -45,7 +45,7 @@ static u32 get_cpu_asid_bits(void)
 	default:
 		pr_warn("CPU%d: Unknown ASID size (%d); assuming 8-bit\n",
 					smp_processor_id(),  fld);
-		/* Fallthrough */
+		fallthrough;
 	case 0:
 		asid = 8;
 		break;