diff --git linux-libre-5.4.172-gnu1/Makefile linux-libre-5.4.173-gnu1/Makefile
index 82c609bb48f3..7cffedf6d9b4 100644
--- linux-libre-5.4.172-gnu1/Makefile
+++ linux-libre-5.4.173-gnu1/Makefile
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 VERSION = 5
 PATCHLEVEL = 4
-SUBLEVEL = 172
+SUBLEVEL = 173
 EXTRAVERSION = -gnu1
 NAME = Kleptomaniac Octopus
 
@@ -1022,7 +1022,7 @@ HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 
 ifdef CONFIG_STACK_VALIDATION
   has_libelf := $(call try-run,\
-		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
+		echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
   ifeq ($(has_libelf),1)
     objtool_target := tools/objtool FORCE
   else
diff --git linux-libre-5.4.172-gnu1/arch/arm/kernel/perf_callchain.c linux-libre-5.4.173-gnu1/arch/arm/kernel/perf_callchain.c
index 3b69a76d341e..1626dfc6f6ce 100644
--- linux-libre-5.4.172-gnu1/arch/arm/kernel/perf_callchain.c
+++ linux-libre-5.4.173-gnu1/arch/arm/kernel/perf_callchain.c
@@ -62,9 +62,10 @@ user_backtrace(struct frame_tail __user *tail,
 void
 perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
 	struct frame_tail __user *tail;
 
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
+	if (guest_cbs && guest_cbs->is_in_guest()) {
 		/* We don't support guest os callchain now */
 		return;
 	}
@@ -98,9 +99,10 @@ callchain_trace(struct stackframe *fr,
 void
 perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
 	struct stackframe fr;
 
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
+	if (guest_cbs && guest_cbs->is_in_guest()) {
 		/* We don't support guest os callchain now */
 		return;
 	}
@@ -111,18 +113,21 @@ perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *re
 
 unsigned long perf_instruction_pointer(struct pt_regs *regs)
 {
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest())
-		return perf_guest_cbs->get_guest_ip();
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
+
+	if (guest_cbs && guest_cbs->is_in_guest())
+		return guest_cbs->get_guest_ip();
 
 	return instruction_pointer(regs);
 }
 
 unsigned long perf_misc_flags(struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
 	int misc = 0;
 
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
-		if (perf_guest_cbs->is_user_mode())
+	if (guest_cbs && guest_cbs->is_in_guest()) {
+		if (guest_cbs->is_user_mode())
 			misc |= PERF_RECORD_MISC_GUEST_USER;
 		else
 			misc |= PERF_RECORD_MISC_GUEST_KERNEL;
diff --git linux-libre-5.4.172-gnu1/arch/arm/mm/Kconfig linux-libre-5.4.173-gnu1/arch/arm/mm/Kconfig
index fc388eb60e0b..64cce0c8560a 100644
--- linux-libre-5.4.172-gnu1/arch/arm/mm/Kconfig
+++ linux-libre-5.4.173-gnu1/arch/arm/mm/Kconfig
@@ -743,6 +743,7 @@ config SWP_EMULATE
 config CPU_BIG_ENDIAN
 	bool "Build big-endian kernel"
 	depends on ARCH_SUPPORTS_BIG_ENDIAN
+	depends on !LD_IS_LLD
 	help
 	  Say Y if you plan on running a kernel in big-endian mode.
 	  Note that your board must be properly built and your board
diff --git linux-libre-5.4.172-gnu1/arch/arm64/kernel/perf_callchain.c linux-libre-5.4.173-gnu1/arch/arm64/kernel/perf_callchain.c
index b0e03e052dd1..b84ec4ce7d8d 100644
--- linux-libre-5.4.172-gnu1/arch/arm64/kernel/perf_callchain.c
+++ linux-libre-5.4.173-gnu1/arch/arm64/kernel/perf_callchain.c
@@ -102,7 +102,9 @@ compat_user_backtrace(struct compat_frame_tail __user *tail,
 void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
 			 struct pt_regs *regs)
 {
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
+
+	if (guest_cbs && guest_cbs->is_in_guest()) {
 		/* We don't support guest os callchain now */
 		return;
 	}
@@ -147,9 +149,10 @@ static int callchain_trace(struct stackframe *frame, void *data)
 void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
 			   struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
 	struct stackframe frame;
 
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
+	if (guest_cbs && guest_cbs->is_in_guest()) {
 		/* We don't support guest os callchain now */
 		return;
 	}
@@ -160,18 +163,21 @@ void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
 
 unsigned long perf_instruction_pointer(struct pt_regs *regs)
 {
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest())
-		return perf_guest_cbs->get_guest_ip();
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
+
+	if (guest_cbs && guest_cbs->is_in_guest())
+		return guest_cbs->get_guest_ip();
 
 	return instruction_pointer(regs);
 }
 
 unsigned long perf_misc_flags(struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
 	int misc = 0;
 
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
-		if (perf_guest_cbs->is_user_mode())
+	if (guest_cbs && guest_cbs->is_in_guest()) {
+		if (guest_cbs->is_user_mode())
 			misc |= PERF_RECORD_MISC_GUEST_USER;
 		else
 			misc |= PERF_RECORD_MISC_GUEST_KERNEL;
diff --git linux-libre-5.4.172-gnu1/arch/csky/kernel/perf_callchain.c linux-libre-5.4.173-gnu1/arch/csky/kernel/perf_callchain.c
index ab55e98ee8f6..35318a635a5f 100644
--- linux-libre-5.4.172-gnu1/arch/csky/kernel/perf_callchain.c
+++ linux-libre-5.4.173-gnu1/arch/csky/kernel/perf_callchain.c
@@ -86,10 +86,11 @@ static unsigned long user_backtrace(struct perf_callchain_entry_ctx *entry,
 void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
 			 struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
 	unsigned long fp = 0;
 
 	/* C-SKY does not support virtualization. */
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest())
+	if (guest_cbs && guest_cbs->is_in_guest())
 		return;
 
 	fp = regs->regs[4];
@@ -110,10 +111,11 @@ void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
 void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
 			   struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
 	struct stackframe fr;
 
 	/* C-SKY does not support virtualization. */
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
+	if (guest_cbs && guest_cbs->is_in_guest()) {
 		pr_warn("C-SKY does not support perf in guest mode!");
 		return;
 	}
diff --git linux-libre-5.4.172-gnu1/arch/nds32/kernel/perf_event_cpu.c linux-libre-5.4.173-gnu1/arch/nds32/kernel/perf_event_cpu.c
index 334c2a6cec23..8a4f9babb164 100644
--- linux-libre-5.4.172-gnu1/arch/nds32/kernel/perf_event_cpu.c
+++ linux-libre-5.4.173-gnu1/arch/nds32/kernel/perf_event_cpu.c
@@ -1363,6 +1363,7 @@ void
 perf_callchain_user(struct perf_callchain_entry_ctx *entry,
 		    struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
 	unsigned long fp = 0;
 	unsigned long gp = 0;
 	unsigned long lp = 0;
@@ -1371,7 +1372,7 @@ perf_callchain_user(struct perf_callchain_entry_ctx *entry,
 
 	leaf_fp = 0;
 
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
+	if (guest_cbs && guest_cbs->is_in_guest()) {
 		/* We don't support guest os callchain now */
 		return;
 	}
@@ -1479,9 +1480,10 @@ void
 perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
 		      struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
 	struct stackframe fr;
 
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
+	if (guest_cbs && guest_cbs->is_in_guest()) {
 		/* We don't support guest os callchain now */
 		return;
 	}
@@ -1493,20 +1495,23 @@ perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
 
 unsigned long perf_instruction_pointer(struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
+
 	/* However, NDS32 does not support virtualization */
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest())
-		return perf_guest_cbs->get_guest_ip();
+	if (guest_cbs && guest_cbs->is_in_guest())
+		return guest_cbs->get_guest_ip();
 
 	return instruction_pointer(regs);
 }
 
 unsigned long perf_misc_flags(struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
 	int misc = 0;
 
 	/* However, NDS32 does not support virtualization */
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
-		if (perf_guest_cbs->is_user_mode())
+	if (guest_cbs && guest_cbs->is_in_guest()) {
+		if (guest_cbs->is_user_mode())
 			misc |= PERF_RECORD_MISC_GUEST_USER;
 		else
 			misc |= PERF_RECORD_MISC_GUEST_KERNEL;
diff --git linux-libre-5.4.172-gnu1/arch/riscv/kernel/perf_callchain.c linux-libre-5.4.173-gnu1/arch/riscv/kernel/perf_callchain.c
index 8d2804f05cf9..22a93009362d 100644
--- linux-libre-5.4.172-gnu1/arch/riscv/kernel/perf_callchain.c
+++ linux-libre-5.4.173-gnu1/arch/riscv/kernel/perf_callchain.c
@@ -60,10 +60,11 @@ static unsigned long user_backtrace(struct perf_callchain_entry_ctx *entry,
 void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
 			 struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
 	unsigned long fp = 0;
 
 	/* RISC-V does not support perf in guest mode. */
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest())
+	if (guest_cbs && guest_cbs->is_in_guest())
 		return;
 
 	fp = regs->s0;
@@ -84,8 +85,10 @@ void notrace walk_stackframe(struct task_struct *task,
 void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
 			   struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
+
 	/* RISC-V does not support perf in guest mode. */
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
+	if (guest_cbs && guest_cbs->is_in_guest()) {
 		pr_warn("RISC-V does not support perf in guest mode!");
 		return;
 	}
diff --git linux-libre-5.4.172-gnu1/arch/s390/kvm/interrupt.c linux-libre-5.4.173-gnu1/arch/s390/kvm/interrupt.c
index fd73a8aa89d2..8be5750fe5ac 100644
--- linux-libre-5.4.172-gnu1/arch/s390/kvm/interrupt.c
+++ linux-libre-5.4.173-gnu1/arch/s390/kvm/interrupt.c
@@ -1982,6 +1982,13 @@ int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
 	return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
 }
 
+int kvm_s390_is_restart_irq_pending(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+	return test_bit(IRQ_PEND_RESTART, &li->pending_irqs);
+}
+
 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
 {
 	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
diff --git linux-libre-5.4.172-gnu1/arch/s390/kvm/kvm-s390.c linux-libre-5.4.173-gnu1/arch/s390/kvm/kvm-s390.c
index b286818d8d54..49dc00d82e5e 100644
--- linux-libre-5.4.172-gnu1/arch/s390/kvm/kvm-s390.c
+++ linux-libre-5.4.173-gnu1/arch/s390/kvm/kvm-s390.c
@@ -4205,10 +4205,15 @@ void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
 	spin_lock(&vcpu->kvm->arch.start_stop_lock);
 	online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
 
-	/* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */
+	/*
+	 * Set the VCPU to STOPPED and THEN clear the interrupt flag,
+	 * now that the SIGP STOP and SIGP STOP AND STORE STATUS orders
+	 * have been fully processed. This will ensure that the VCPU
+	 * is kept BUSY if another VCPU is inquiring with SIGP SENSE.
+	 */
+	kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED);
 	kvm_s390_clear_stop_irq(vcpu);
 
-	kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED);
 	__disable_ibs_on_vcpu(vcpu);
 
 	for (i = 0; i < online_vcpus; i++) {
diff --git linux-libre-5.4.172-gnu1/arch/s390/kvm/kvm-s390.h linux-libre-5.4.173-gnu1/arch/s390/kvm/kvm-s390.h
index 63d94a5253a8..d497d3e58784 100644
--- linux-libre-5.4.172-gnu1/arch/s390/kvm/kvm-s390.h
+++ linux-libre-5.4.173-gnu1/arch/s390/kvm/kvm-s390.h
@@ -373,6 +373,7 @@ void kvm_s390_destroy_adapters(struct kvm *kvm);
 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu);
 extern struct kvm_device_ops kvm_flic_ops;
 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu);
+int kvm_s390_is_restart_irq_pending(struct kvm_vcpu *vcpu);
 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu);
 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu,
 			   void __user *buf, int len);
diff --git linux-libre-5.4.172-gnu1/arch/s390/kvm/sigp.c linux-libre-5.4.173-gnu1/arch/s390/kvm/sigp.c
index 683036c1c92a..3dc921e853b6 100644
--- linux-libre-5.4.172-gnu1/arch/s390/kvm/sigp.c
+++ linux-libre-5.4.173-gnu1/arch/s390/kvm/sigp.c
@@ -288,6 +288,34 @@ static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
 	if (!dst_vcpu)
 		return SIGP_CC_NOT_OPERATIONAL;
 
+	/*
+	 * SIGP RESTART, SIGP STOP, and SIGP STOP AND STORE STATUS orders
+	 * are processed asynchronously. Until the affected VCPU finishes
+	 * its work and calls back into KVM to clear the (RESTART or STOP)
+	 * interrupt, we need to return any new non-reset orders "busy".
+	 *
+	 * This is important because a single VCPU could issue:
+	 *  1) SIGP STOP $DESTINATION
+	 *  2) SIGP SENSE $DESTINATION
+	 *
+	 * If the SIGP SENSE would not be rejected as "busy", it could
+	 * return an incorrect answer as to whether the VCPU is STOPPED
+	 * or OPERATING.
+	 */
+	if (order_code != SIGP_INITIAL_CPU_RESET &&
+	    order_code != SIGP_CPU_RESET) {
+		/*
+		 * Lockless check. Both SIGP STOP and SIGP (RE)START
+		 * properly synchronize everything while processing
+		 * their orders, while the guest cannot observe a
+		 * difference when issuing other orders from two
+		 * different VCPUs.
+		 */
+		if (kvm_s390_is_stop_irq_pending(dst_vcpu) ||
+		    kvm_s390_is_restart_irq_pending(dst_vcpu))
+			return SIGP_CC_BUSY;
+	}
+
 	switch (order_code) {
 	case SIGP_SENSE:
 		vcpu->stat.instruction_sigp_sense++;
diff --git linux-libre-5.4.172-gnu1/arch/x86/events/core.c linux-libre-5.4.173-gnu1/arch/x86/events/core.c
index 00bccb4d1772..e4f7ac28dcf2 100644
--- linux-libre-5.4.172-gnu1/arch/x86/events/core.c
+++ linux-libre-5.4.173-gnu1/arch/x86/events/core.c
@@ -2366,10 +2366,11 @@ static bool perf_hw_regs(struct pt_regs *regs)
 void
 perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
 	struct unwind_state state;
 	unsigned long addr;
 
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
+	if (guest_cbs && guest_cbs->is_in_guest()) {
 		/* TODO: We don't support guest os callchain now */
 		return;
 	}
@@ -2475,10 +2476,11 @@ perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry_ctx *ent
 void
 perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
 	struct stack_frame frame;
 	const unsigned long __user *fp;
 
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
+	if (guest_cbs && guest_cbs->is_in_guest()) {
 		/* TODO: We don't support guest os callchain now */
 		return;
 	}
@@ -2562,18 +2564,21 @@ static unsigned long code_segment_base(struct pt_regs *regs)
 
 unsigned long perf_instruction_pointer(struct pt_regs *regs)
 {
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest())
-		return perf_guest_cbs->get_guest_ip();
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
+
+	if (guest_cbs && guest_cbs->is_in_guest())
+		return guest_cbs->get_guest_ip();
 
 	return regs->ip + code_segment_base(regs);
 }
 
 unsigned long perf_misc_flags(struct pt_regs *regs)
 {
+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
 	int misc = 0;
 
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
-		if (perf_guest_cbs->is_user_mode())
+	if (guest_cbs && guest_cbs->is_in_guest()) {
+		if (guest_cbs->is_user_mode())
 			misc |= PERF_RECORD_MISC_GUEST_USER;
 		else
 			misc |= PERF_RECORD_MISC_GUEST_KERNEL;
diff --git linux-libre-5.4.172-gnu1/arch/x86/events/intel/core.c linux-libre-5.4.173-gnu1/arch/x86/events/intel/core.c
index 335348ea4e56..a509bcab31a3 100644
--- linux-libre-5.4.172-gnu1/arch/x86/events/intel/core.c
+++ linux-libre-5.4.173-gnu1/arch/x86/events/intel/core.c
@@ -2333,6 +2333,7 @@ static int handle_pmi_common(struct pt_regs *regs, u64 status)
 {
 	struct perf_sample_data data;
 	struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
+	struct perf_guest_info_callbacks *guest_cbs;
 	int bit;
 	int handled = 0;
 
@@ -2386,9 +2387,11 @@ static int handle_pmi_common(struct pt_regs *regs, u64 status)
 	 */
 	if (__test_and_clear_bit(55, (unsigned long *)&status)) {
 		handled++;
-		if (unlikely(perf_guest_cbs && perf_guest_cbs->is_in_guest() &&
-			perf_guest_cbs->handle_intel_pt_intr))
-			perf_guest_cbs->handle_intel_pt_intr();
+
+		guest_cbs = perf_get_guest_cbs();
+		if (unlikely(guest_cbs && guest_cbs->is_in_guest() &&
+			     guest_cbs->handle_intel_pt_intr))
+			guest_cbs->handle_intel_pt_intr();
 		else
 			intel_pt_interrupt();
 	}
diff --git linux-libre-5.4.172-gnu1/arch/x86/kvm/x86.c linux-libre-5.4.173-gnu1/arch/x86/kvm/x86.c
index 0aaf40be956f..1f7dfa5aa42d 100644
--- linux-libre-5.4.172-gnu1/arch/x86/kvm/x86.c
+++ linux-libre-5.4.173-gnu1/arch/x86/kvm/x86.c
@@ -1218,7 +1218,7 @@ static const u32 msrs_to_save_all[] = {
 	MSR_IA32_UMWAIT_CONTROL,
 
 	MSR_ARCH_PERFMON_FIXED_CTR0, MSR_ARCH_PERFMON_FIXED_CTR1,
-	MSR_ARCH_PERFMON_FIXED_CTR0 + 2, MSR_ARCH_PERFMON_FIXED_CTR0 + 3,
+	MSR_ARCH_PERFMON_FIXED_CTR0 + 2,
 	MSR_CORE_PERF_FIXED_CTR_CTRL, MSR_CORE_PERF_GLOBAL_STATUS,
 	MSR_CORE_PERF_GLOBAL_CTRL, MSR_CORE_PERF_GLOBAL_OVF_CTRL,
 	MSR_ARCH_PERFMON_PERFCTR0, MSR_ARCH_PERFMON_PERFCTR1,
diff --git linux-libre-5.4.172-gnu1/drivers/base/devtmpfs.c linux-libre-5.4.173-gnu1/drivers/base/devtmpfs.c
index 30d0523014e0..5e9b00711357 100644
--- linux-libre-5.4.172-gnu1/drivers/base/devtmpfs.c
+++ linux-libre-5.4.173-gnu1/drivers/base/devtmpfs.c
@@ -25,6 +25,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/kthread.h>
+#include <linux/fs_context.h>
 #include <uapi/linux/mount.h>
 #include "base.h"
 
@@ -62,8 +63,15 @@ static struct dentry *public_dev_mount(struct file_system_type *fs_type, int fla
 		      const char *dev_name, void *data)
 {
 	struct super_block *s = mnt->mnt_sb;
+	int err;
+
 	atomic_inc(&s->s_active);
 	down_write(&s->s_umount);
+	err = reconfigure_single(s, flags, data);
+	if (err < 0) {
+		deactivate_locked_super(s);
+		return ERR_PTR(err);
+	}
 	return dget(s->s_root);
 }
 
diff --git linux-libre-5.4.172-gnu1/drivers/firmware/qemu_fw_cfg.c linux-libre-5.4.173-gnu1/drivers/firmware/qemu_fw_cfg.c
index 59db70fb4561..314b9bb78e43 100644
--- linux-libre-5.4.172-gnu1/drivers/firmware/qemu_fw_cfg.c
+++ linux-libre-5.4.173-gnu1/drivers/firmware/qemu_fw_cfg.c
@@ -385,9 +385,7 @@ static void fw_cfg_sysfs_cache_cleanup(void)
 	struct fw_cfg_sysfs_entry *entry, *next;
 
 	list_for_each_entry_safe(entry, next, &fw_cfg_entry_cache, list) {
-		/* will end up invoking fw_cfg_sysfs_cache_delist()
-		 * via each object's release() method (i.e. destructor)
-		 */
+		fw_cfg_sysfs_cache_delist(entry);
 		kobject_put(&entry->kobj);
 	}
 }
@@ -445,7 +443,6 @@ static void fw_cfg_sysfs_release_entry(struct kobject *kobj)
 {
 	struct fw_cfg_sysfs_entry *entry = to_entry(kobj);
 
-	fw_cfg_sysfs_cache_delist(entry);
 	kfree(entry);
 }
 
@@ -598,20 +595,18 @@ static int fw_cfg_register_file(const struct fw_cfg_file *f)
 	/* set file entry information */
 	entry->size = be32_to_cpu(f->size);
 	entry->select = be16_to_cpu(f->select);
-	memcpy(entry->name, f->name, FW_CFG_MAX_FILE_PATH);
+	strscpy(entry->name, f->name, FW_CFG_MAX_FILE_PATH);
 
 	/* register entry under "/sys/firmware/qemu_fw_cfg/by_key/" */
 	err = kobject_init_and_add(&entry->kobj, &fw_cfg_sysfs_entry_ktype,
 				   fw_cfg_sel_ko, "%d", entry->select);
-	if (err) {
-		kobject_put(&entry->kobj);
-		return err;
-	}
+	if (err)
+		goto err_put_entry;
 
 	/* add raw binary content access */
 	err = sysfs_create_bin_file(&entry->kobj, &fw_cfg_sysfs_attr_raw);
 	if (err)
-		goto err_add_raw;
+		goto err_del_entry;
 
 	/* try adding "/sys/firmware/qemu_fw_cfg/by_name/" symlink */
 	fw_cfg_build_symlink(fw_cfg_fname_kset, &entry->kobj, entry->name);
@@ -620,9 +615,10 @@ static int fw_cfg_register_file(const struct fw_cfg_file *f)
 	fw_cfg_sysfs_cache_enlist(entry);
 	return 0;
 
-err_add_raw:
+err_del_entry:
 	kobject_del(&entry->kobj);
-	kfree(entry);
+err_put_entry:
+	kobject_put(&entry->kobj);
 	return err;
 }
 
diff --git linux-libre-5.4.172-gnu1/drivers/media/usb/uvc/uvc_video.c linux-libre-5.4.173-gnu1/drivers/media/usb/uvc/uvc_video.c
index 96b85d66e7a8..fe58723fc5ac 100644
--- linux-libre-5.4.172-gnu1/drivers/media/usb/uvc/uvc_video.c
+++ linux-libre-5.4.173-gnu1/drivers/media/usb/uvc/uvc_video.c
@@ -1915,6 +1915,10 @@ static int uvc_video_start_transfer(struct uvc_streaming *stream,
 		if (ep == NULL)
 			return -EIO;
 
+		/* Reject broken descriptors. */
+		if (usb_endpoint_maxp(&ep->desc) == 0)
+			return -EIO;
+
 		ret = uvc_init_video_bulk(stream, ep, gfp_flags);
 	}
 
diff --git linux-libre-5.4.172-gnu1/drivers/mtd/chips/Kconfig linux-libre-5.4.173-gnu1/drivers/mtd/chips/Kconfig
index a7e47e068ad9..7769a9b556c7 100644
--- linux-libre-5.4.172-gnu1/drivers/mtd/chips/Kconfig
+++ linux-libre-5.4.173-gnu1/drivers/mtd/chips/Kconfig
@@ -55,12 +55,14 @@ choice
 	  LITTLE_ENDIAN_BYTE, if the bytes are reversed.
 
 config MTD_CFI_NOSWAP
+	depends on !ARCH_IXP4XX || CPU_BIG_ENDIAN
 	bool "NO"
 
 config MTD_CFI_BE_BYTE_SWAP
 	bool "BIG_ENDIAN_BYTE"
 
 config MTD_CFI_LE_BYTE_SWAP
+	depends on !ARCH_IXP4XX
 	bool "LITTLE_ENDIAN_BYTE"
 
 endchoice
diff --git linux-libre-5.4.172-gnu1/drivers/mtd/maps/Kconfig linux-libre-5.4.173-gnu1/drivers/mtd/maps/Kconfig
index bc82305ebb4c..ffbf4f6cb9cf 100644
--- linux-libre-5.4.172-gnu1/drivers/mtd/maps/Kconfig
+++ linux-libre-5.4.173-gnu1/drivers/mtd/maps/Kconfig
@@ -303,7 +303,7 @@ config MTD_DC21285
 
 config MTD_IXP4XX
 	tristate "CFI Flash device mapped on Intel IXP4xx based systems"
-	depends on MTD_CFI && MTD_COMPLEX_MAPPINGS && ARCH_IXP4XX
+	depends on MTD_CFI && MTD_COMPLEX_MAPPINGS && ARCH_IXP4XX && MTD_CFI_ADV_OPTIONS
 	help
 	  This enables MTD access to flash devices on platforms based
 	  on Intel's IXP4xx family of network processors such as the
diff --git linux-libre-5.4.172-gnu1/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c linux-libre-5.4.173-gnu1/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c
index f070f25bb735..df7a14320fd2 100644
--- linux-libre-5.4.172-gnu1/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c
+++ linux-libre-5.4.173-gnu1/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c
@@ -1000,6 +1000,7 @@ int rtl92cu_hw_init(struct ieee80211_hw *hw)
 	_initpabias(hw);
 	rtl92c_dm_init(hw);
 exit:
+	local_irq_disable();
 	local_irq_restore(flags);
 	return err;
 }
diff --git linux-libre-5.4.172-gnu1/fs/fs_context.c linux-libre-5.4.173-gnu1/fs/fs_context.c
index 138b5b4d621d..a2367c7aef5b 100644
--- linux-libre-5.4.172-gnu1/fs/fs_context.c
+++ linux-libre-5.4.173-gnu1/fs/fs_context.c
@@ -585,7 +585,7 @@ static int legacy_parse_param(struct fs_context *fc, struct fs_parameter *param)
 			      param->key);
 	}
 
-	if (len > PAGE_SIZE - 2 - size)
+	if (size + len + 2 > PAGE_SIZE)
 		return invalf(fc, "VFS: Legacy: Cumulative options too large");
 	if (strchr(param->key, ',') ||
 	    (param->type == fs_value_is_string &&
diff --git linux-libre-5.4.172-gnu1/fs/orangefs/orangefs-bufmap.c linux-libre-5.4.173-gnu1/fs/orangefs/orangefs-bufmap.c
index 2bb916d68576..023b9bc54b7c 100644
--- linux-libre-5.4.172-gnu1/fs/orangefs/orangefs-bufmap.c
+++ linux-libre-5.4.173-gnu1/fs/orangefs/orangefs-bufmap.c
@@ -179,7 +179,7 @@ orangefs_bufmap_free(struct orangefs_bufmap *bufmap)
 {
 	kfree(bufmap->page_array);
 	kfree(bufmap->desc_array);
-	kfree(bufmap->buffer_index_array);
+	bitmap_free(bufmap->buffer_index_array);
 	kfree(bufmap);
 }
 
@@ -229,8 +229,7 @@ orangefs_bufmap_alloc(struct ORANGEFS_dev_map_desc *user_desc)
 	bufmap->desc_size = user_desc->size;
 	bufmap->desc_shift = ilog2(bufmap->desc_size);
 
-	bufmap->buffer_index_array =
-		kzalloc(DIV_ROUND_UP(bufmap->desc_count, BITS_PER_LONG), GFP_KERNEL);
+	bufmap->buffer_index_array = bitmap_zalloc(bufmap->desc_count, GFP_KERNEL);
 	if (!bufmap->buffer_index_array)
 		goto out_free_bufmap;
 
@@ -253,7 +252,7 @@ orangefs_bufmap_alloc(struct ORANGEFS_dev_map_desc *user_desc)
 out_free_desc_array:
 	kfree(bufmap->desc_array);
 out_free_index_array:
-	kfree(bufmap->buffer_index_array);
+	bitmap_free(bufmap->buffer_index_array);
 out_free_bufmap:
 	kfree(bufmap);
 out:
diff --git linux-libre-5.4.172-gnu1/fs/super.c linux-libre-5.4.173-gnu1/fs/super.c
index 877532baf513..b289356f302f 100644
--- linux-libre-5.4.172-gnu1/fs/super.c
+++ linux-libre-5.4.173-gnu1/fs/super.c
@@ -1470,8 +1470,8 @@ struct dentry *mount_nodev(struct file_system_type *fs_type,
 }
 EXPORT_SYMBOL(mount_nodev);
 
-static int reconfigure_single(struct super_block *s,
-			      int flags, void *data)
+int reconfigure_single(struct super_block *s,
+		       int flags, void *data)
 {
 	struct fs_context *fc;
 	int ret;
diff --git linux-libre-5.4.172-gnu1/include/linux/fs_context.h linux-libre-5.4.173-gnu1/include/linux/fs_context.h
index ba8a58754340..ebcb91a57e86 100644
--- linux-libre-5.4.172-gnu1/include/linux/fs_context.h
+++ linux-libre-5.4.173-gnu1/include/linux/fs_context.h
@@ -135,6 +135,8 @@ extern int generic_parse_monolithic(struct fs_context *fc, void *data);
 extern int vfs_get_tree(struct fs_context *fc);
 extern void put_fs_context(struct fs_context *fc);
 extern void fc_drop_locked(struct fs_context *fc);
+int reconfigure_single(struct super_block *s,
+		       int flags, void *data);
 
 /*
  * sget() wrappers to be called from the ->get_tree() op.
diff --git linux-libre-5.4.172-gnu1/include/linux/perf_event.h linux-libre-5.4.173-gnu1/include/linux/perf_event.h
index 68ccc5b1913b..b7ac395513c0 100644
--- linux-libre-5.4.172-gnu1/include/linux/perf_event.h
+++ linux-libre-5.4.173-gnu1/include/linux/perf_event.h
@@ -1175,7 +1175,18 @@ extern void perf_event_bpf_event(struct bpf_prog *prog,
 				 enum perf_bpf_event_type type,
 				 u16 flags);
 
-extern struct perf_guest_info_callbacks *perf_guest_cbs;
+extern struct perf_guest_info_callbacks __rcu *perf_guest_cbs;
+static inline struct perf_guest_info_callbacks *perf_get_guest_cbs(void)
+{
+	/*
+	 * Callbacks are RCU-protected and must be READ_ONCE to avoid reloading
+	 * the callbacks between a !NULL check and dereferences, to ensure
+	 * pending stores/changes to the callback pointers are visible before a
+	 * non-NULL perf_guest_cbs is visible to readers, and to prevent a
+	 * module from unloading callbacks while readers are active.
+	 */
+	return rcu_dereference(perf_guest_cbs);
+}
 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
 
diff --git linux-libre-5.4.172-gnu1/kernel/events/core.c linux-libre-5.4.173-gnu1/kernel/events/core.c
index 6ffe3d3e7b06..7e124f9abb18 100644
--- linux-libre-5.4.172-gnu1/kernel/events/core.c
+++ linux-libre-5.4.173-gnu1/kernel/events/core.c
@@ -6045,18 +6045,25 @@ static void perf_pending_event(struct irq_work *entry)
  * Later on, we might change it to a list if there is
  * another virtualization implementation supporting the callbacks.
  */
-struct perf_guest_info_callbacks *perf_guest_cbs;
+struct perf_guest_info_callbacks __rcu *perf_guest_cbs;
 
 int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs)
 {
-	perf_guest_cbs = cbs;
+	if (WARN_ON_ONCE(rcu_access_pointer(perf_guest_cbs)))
+		return -EBUSY;
+
+	rcu_assign_pointer(perf_guest_cbs, cbs);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(perf_register_guest_info_callbacks);
 
 int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs)
 {
-	perf_guest_cbs = NULL;
+	if (WARN_ON_ONCE(rcu_access_pointer(perf_guest_cbs) != cbs))
+		return -EINVAL;
+
+	rcu_assign_pointer(perf_guest_cbs, NULL);
+	synchronize_rcu();
 	return 0;
 }
 EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks);
diff --git linux-libre-5.4.172-gnu1/sound/pci/hda/patch_realtek.c linux-libre-5.4.173-gnu1/sound/pci/hda/patch_realtek.c
index 022799479a72..d06205626cd5 100644
--- linux-libre-5.4.172-gnu1/sound/pci/hda/patch_realtek.c
+++ linux-libre-5.4.173-gnu1/sound/pci/hda/patch_realtek.c
@@ -1926,6 +1926,7 @@ enum {
 	ALC887_FIXUP_ASUS_BASS,
 	ALC887_FIXUP_BASS_CHMAP,
 	ALC1220_FIXUP_GB_DUAL_CODECS,
+	ALC1220_FIXUP_GB_X570,
 	ALC1220_FIXUP_CLEVO_P950,
 	ALC1220_FIXUP_CLEVO_PB51ED,
 	ALC1220_FIXUP_CLEVO_PB51ED_PINS,
@@ -2115,6 +2116,29 @@ static void alc1220_fixup_gb_dual_codecs(struct hda_codec *codec,
 	}
 }
 
+static void alc1220_fixup_gb_x570(struct hda_codec *codec,
+				     const struct hda_fixup *fix,
+				     int action)
+{
+	static const hda_nid_t conn1[] = { 0x0c };
+	static const struct coef_fw gb_x570_coefs[] = {
+		WRITE_COEF(0x1a, 0x01c1),
+		WRITE_COEF(0x1b, 0x0202),
+		WRITE_COEF(0x43, 0x3005),
+		{}
+	};
+
+	switch (action) {
+	case HDA_FIXUP_ACT_PRE_PROBE:
+		snd_hda_override_conn_list(codec, 0x14, ARRAY_SIZE(conn1), conn1);
+		snd_hda_override_conn_list(codec, 0x1b, ARRAY_SIZE(conn1), conn1);
+		break;
+	case HDA_FIXUP_ACT_INIT:
+		alc_process_coef_fw(codec, gb_x570_coefs);
+		break;
+	}
+}
+
 static void alc1220_fixup_clevo_p950(struct hda_codec *codec,
 				     const struct hda_fixup *fix,
 				     int action)
@@ -2417,6 +2441,10 @@ static const struct hda_fixup alc882_fixups[] = {
 		.type = HDA_FIXUP_FUNC,
 		.v.func = alc1220_fixup_gb_dual_codecs,
 	},
+	[ALC1220_FIXUP_GB_X570] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc1220_fixup_gb_x570,
+	},
 	[ALC1220_FIXUP_CLEVO_P950] = {
 		.type = HDA_FIXUP_FUNC,
 		.v.func = alc1220_fixup_clevo_p950,
@@ -2519,7 +2547,7 @@ static const struct snd_pci_quirk alc882_fixup_tbl[] = {
 	SND_PCI_QUIRK(0x13fe, 0x1009, "Advantech MIT-W101", ALC886_FIXUP_EAPD),
 	SND_PCI_QUIRK(0x1458, 0xa002, "Gigabyte EP45-DS3/Z87X-UD3H", ALC889_FIXUP_FRONT_HP_NO_PRESENCE),
 	SND_PCI_QUIRK(0x1458, 0xa0b8, "Gigabyte AZ370-Gaming", ALC1220_FIXUP_GB_DUAL_CODECS),
-	SND_PCI_QUIRK(0x1458, 0xa0cd, "Gigabyte X570 Aorus Master", ALC1220_FIXUP_CLEVO_P950),
+	SND_PCI_QUIRK(0x1458, 0xa0cd, "Gigabyte X570 Aorus Master", ALC1220_FIXUP_GB_X570),
 	SND_PCI_QUIRK(0x1458, 0xa0ce, "Gigabyte X570 Aorus Xtreme", ALC1220_FIXUP_CLEVO_P950),
 	SND_PCI_QUIRK(0x1462, 0x11f7, "MSI-GE63", ALC1220_FIXUP_CLEVO_P950),
 	SND_PCI_QUIRK(0x1462, 0x1228, "MSI-GP63", ALC1220_FIXUP_CLEVO_P950),
