Merge tag 'riscv-for-linus-6.19-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

Pull RISC-V updates from Paul Walmsley:

 - Enable parallel hotplug for RISC-V

 - Optimize vector regset allocation for ptrace()

 - Add a kernel selftest for the vector ptrace interface

 - Enable the userspace RAID6 test to build and run using RISC-V vectors

 - Add initial support for the Zalasr RISC-V ratified ISA extension

 - For the Zicbop RISC-V ratified ISA extension to userspace, expose
   hardware and kernel support to userspace and add a kselftest for
   Zicbop

 - Convert open-coded instances of 'asm goto's that are controlled by
   runtime ALTERNATIVEs to use riscv_has_extension_{un,}likely(),
   following arm64's alternative_has_cap_{un,}likely()

 - Remove an unnecessary mask in the GFP flags used in some calls to
   pagetable_alloc()

* tag 'riscv-for-linus-6.19-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  selftests/riscv: Add Zicbop prefetch test
  riscv: hwprobe: Expose Zicbop extension and its block size
  riscv: Introduce Zalasr instructions
  riscv: hwprobe: Export Zalasr extension
  dt-bindings: riscv: Add Zalasr ISA extension description
  riscv: Add ISA extension parsing for Zalasr
  selftests: riscv: Add test for the Vector ptrace interface
  riscv: ptrace: Optimize the allocation of vector regset
  raid6: test: Add support for RISC-V
  raid6: riscv: Allow code to be compiled in userspace
  raid6: riscv: Prevent compiler from breaking inline vector assembly code
  riscv: cmpxchg: Use riscv_has_extension_likely
  riscv: bitops: Use riscv_has_extension_likely
  riscv: hweight: Use riscv_has_extension_likely
  riscv: checksum: Use riscv_has_extension_likely
  riscv: pgtable: Use riscv_has_extension_unlikely
  riscv: Remove __GFP_HIGHMEM masking
  RISC-V: Enable HOTPLUG_PARALLEL for secondary CPUs

Documentation/arch/riscv/hwprobe.rst

@@ -249,6 +249,9 @@ The following keys are defined:
        defined in the in the RISC-V ISA manual starting from commit e87412e621f1
        ("integrate Zaamo and Zalrsc text (#1304)").
 
+  * :c:macro:`RISCV_HWPROBE_EXT_ZALASR`: The Zalasr extension is supported as
+       frozen at commit 194f0094 ("Version 0.9 for freeze") of riscv-zalasr.
+
   * :c:macro:`RISCV_HWPROBE_EXT_ZALRSC`: The Zalrsc extension is supported as
        defined in the in the RISC-V ISA manual starting from commit e87412e621f1
        ("integrate Zaamo and Zalrsc text (#1304)").
@@ -275,6 +278,9 @@ The following keys are defined:
        ratified in commit 49f49c842ff9 ("Update to Rafified state") of
        riscv-zabha.
 
+  * :c:macro:`RISCV_HWPROBE_EXT_ZICBOP`: The Zicbop extension is supported, as
+       ratified in commit 3dd606f ("Create cmobase-v1.0.pdf") of riscv-CMOs.
+
 * :c:macro:`RISCV_HWPROBE_KEY_CPUPERF_0`: Deprecated.  Returns similar values to
      :c:macro:`RISCV_HWPROBE_KEY_MISALIGNED_SCALAR_PERF`, but the key was
      mistakenly classified as a bitmask rather than a value.
@@ -369,4 +375,7 @@ The following keys are defined:
 
     * :c:macro:`RISCV_HWPROBE_VENDOR_EXT_XSFVFWMACCQQQ`: The Xsfvfwmaccqqq
         vendor extension is supported in version 1.0 of Matrix Multiply Accumulate
-	Instruction Extensions Specification.
+	Instruction Extensions Specification.
+
+* :c:macro:`RISCV_HWPROBE_KEY_ZICBOP_BLOCK_SIZE`: An unsigned int which
+  represents the size of the Zicbop block in bytes.

Documentation/devicetree/bindings/riscv/extensions.yaml

@@ -248,6 +248,11 @@ properties:
             is supported as ratified at commit 5059e0ca641c ("update to
             ratified") of the riscv-zacas.
 
+        - const: zalasr
+          description: |
+            The standard Zalasr extension for load-acquire/store-release as frozen
+            at commit 194f0094 ("Version 0.9 for freeze") of riscv-zalasr.
+
         - const: zalrsc
           description: |
             The standard Zalrsc extension for load-reserved/store-conditional as

arch/riscv/Kconfig

@@ -200,7 +200,7 @@ config RISCV
 	select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
 	select HAVE_STACKPROTECTOR
 	select HAVE_SYSCALL_TRACEPOINTS
-	select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU
+	select HOTPLUG_PARALLEL if HOTPLUG_CPU
 	select IRQ_DOMAIN
 	select IRQ_FORCED_THREADING
 	select KASAN_VMALLOC if KASAN

arch/riscv/include/asm/arch_hweight.h

@@ -19,10 +19,10 @@
 
 static __always_inline unsigned int __arch_hweight32(unsigned int w)
 {
-#if defined(CONFIG_RISCV_ISA_ZBB) && defined(CONFIG_TOOLCHAIN_HAS_ZBB)
-	asm goto(ALTERNATIVE("j %l[legacy]", "nop", 0,
-				      RISCV_ISA_EXT_ZBB, 1)
-			  : : : : legacy);
+	if (!(IS_ENABLED(CONFIG_RISCV_ISA_ZBB) &&
+	      IS_ENABLED(CONFIG_TOOLCHAIN_HAS_ZBB) &&
+	      riscv_has_extension_likely(RISCV_ISA_EXT_ZBB)))
+		return __sw_hweight32(w);
 
 	asm (".option push\n"
 	     ".option arch,+zbb\n"
@@ -31,10 +31,6 @@ static __always_inline unsigned int __arch_hweight32(unsigned int w)
 	     : "=r" (w) : "r" (w) :);
 
 	return w;
-
-legacy:
-#endif
-	return __sw_hweight32(w);
 }
 
 static inline unsigned int __arch_hweight16(unsigned int w)
@@ -50,10 +46,10 @@ static inline unsigned int __arch_hweight8(unsigned int w)
 #if BITS_PER_LONG == 64
 static __always_inline unsigned long __arch_hweight64(__u64 w)
 {
-#if defined(CONFIG_RISCV_ISA_ZBB) && defined(CONFIG_TOOLCHAIN_HAS_ZBB)
-	asm goto(ALTERNATIVE("j %l[legacy]", "nop", 0,
-				      RISCV_ISA_EXT_ZBB, 1)
-			  : : : : legacy);
+	if (!(IS_ENABLED(CONFIG_RISCV_ISA_ZBB) &&
+	      IS_ENABLED(CONFIG_TOOLCHAIN_HAS_ZBB) &&
+	      riscv_has_extension_likely(RISCV_ISA_EXT_ZBB)))
+		return __sw_hweight64(w);
 
 	asm (".option push\n"
 	     ".option arch,+zbb\n"
@@ -62,10 +58,6 @@ static __always_inline unsigned long __arch_hweight64(__u64 w)
 	     : "=r" (w) : "r" (w) :);
 
 	return w;
-
-legacy:
-#endif
-	return __sw_hweight64(w);
 }
 #else /* BITS_PER_LONG == 64 */
 static inline unsigned long __arch_hweight64(__u64 w)

arch/riscv/include/asm/bitops.h

@@ -47,9 +47,8 @@
 
 static __always_inline __attribute_const__ unsigned long variable__ffs(unsigned long word)
 {
-	asm goto(ALTERNATIVE("j %l[legacy]", "nop", 0,
-				      RISCV_ISA_EXT_ZBB, 1)
-			  : : : : legacy);
+	if (!riscv_has_extension_likely(RISCV_ISA_EXT_ZBB))
+		return generic___ffs(word);
 
 	asm volatile (".option push\n"
 		      ".option arch,+zbb\n"
@@ -58,9 +57,6 @@ static __always_inline __attribute_const__ unsigned long variable__ffs(unsigned
 		      : "=r" (word) : "r" (word) :);
 
 	return word;
-
-legacy:
-	return generic___ffs(word);
 }
 
 /**
@@ -76,9 +72,8 @@ legacy:
 
 static __always_inline __attribute_const__ unsigned long variable__fls(unsigned long word)
 {
-	asm goto(ALTERNATIVE("j %l[legacy]", "nop", 0,
-				      RISCV_ISA_EXT_ZBB, 1)
-			  : : : : legacy);
+	if (!riscv_has_extension_likely(RISCV_ISA_EXT_ZBB))
+		return generic___fls(word);
 
 	asm volatile (".option push\n"
 		      ".option arch,+zbb\n"
@@ -87,9 +82,6 @@ static __always_inline __attribute_const__ unsigned long variable__fls(unsigned
 		      : "=r" (word) : "r" (word) :);
 
 	return BITS_PER_LONG - 1 - word;
-
-legacy:
-	return generic___fls(word);
 }
 
 /**
@@ -105,9 +97,8 @@ legacy:
 
 static __always_inline __attribute_const__ int variable_ffs(int x)
 {
-	asm goto(ALTERNATIVE("j %l[legacy]", "nop", 0,
-				      RISCV_ISA_EXT_ZBB, 1)
-			  : : : : legacy);
+	if (!riscv_has_extension_likely(RISCV_ISA_EXT_ZBB))
+		return generic_ffs(x);
 
 	if (!x)
 		return 0;
@@ -119,9 +110,6 @@ static __always_inline __attribute_const__ int variable_ffs(int x)
 		      : "=r" (x) : "r" (x) :);
 
 	return x + 1;
-
-legacy:
-	return generic_ffs(x);
 }
 
 /**
@@ -137,9 +125,8 @@ legacy:
 
 static __always_inline int variable_fls(unsigned int x)
 {
-	asm goto(ALTERNATIVE("j %l[legacy]", "nop", 0,
-				      RISCV_ISA_EXT_ZBB, 1)
-			  : : : : legacy);
+	if (!riscv_has_extension_likely(RISCV_ISA_EXT_ZBB))
+		return generic_fls(x);
 
 	if (!x)
 		return 0;
@@ -151,9 +138,6 @@ static __always_inline int variable_fls(unsigned int x)
 		      : "=r" (x) : "r" (x) :);
 
 	return 32 - x;
-
-legacy:
-	return generic_fls(x);
 }
 
 /**

arch/riscv/include/asm/checksum.h

@@ -49,16 +49,11 @@ static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
 	 * ZBB only saves three instructions on 32-bit and five on 64-bit so not
 	 * worth checking if supported without Alternatives.
 	 */
-	if (IS_ENABLED(CONFIG_RISCV_ISA_ZBB) && IS_ENABLED(CONFIG_TOOLCHAIN_HAS_ZBB)) {
+	if (IS_ENABLED(CONFIG_RISCV_ISA_ZBB) &&
+	    IS_ENABLED(CONFIG_TOOLCHAIN_HAS_ZBB) &&
+	    riscv_has_extension_likely(RISCV_ISA_EXT_ZBB)) {
 		unsigned long fold_temp;
 
-		asm goto(ALTERNATIVE("j %l[no_zbb]", "nop", 0,
-					      RISCV_ISA_EXT_ZBB, 1)
-		    :
-		    :
-		    :
-		    : no_zbb);
-
 		if (IS_ENABLED(CONFIG_32BIT)) {
 			asm(".option push				\n\
 			.option arch,+zbb				\n\
@@ -81,7 +76,7 @@ static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
 		}
 		return (__force __sum16)(csum >> 16);
 	}
-no_zbb:
+
 #ifndef CONFIG_32BIT
 	csum += ror64(csum, 32);
 	csum >>= 32;

arch/riscv/include/asm/cmpxchg.h

@@ -373,9 +373,10 @@ static __always_inline void __cmpwait(volatile void *ptr,
 	u32 *__ptr32b;
 	ulong __s, __val, __mask;
 
-	asm goto(ALTERNATIVE("j %l[no_zawrs]", "nop",
-			     0, RISCV_ISA_EXT_ZAWRS, 1)
-		 : : : : no_zawrs);
+	if (!riscv_has_extension_likely(RISCV_ISA_EXT_ZAWRS)) {
+		ALT_RISCV_PAUSE();
+		return;
+	}
 
 	switch (size) {
 	case 1:
@@ -437,11 +438,6 @@ static __always_inline void __cmpwait(volatile void *ptr,
 	default:
 		BUILD_BUG();
 	}
-
-	return;
-
-no_zawrs:
-	ALT_RISCV_PAUSE();
 }
 
 #define __cmpwait_relaxed(ptr, val) \

arch/riscv/include/asm/hwcap.h

@@ -107,6 +107,7 @@
 #define RISCV_ISA_EXT_ZALRSC		98
 #define RISCV_ISA_EXT_ZICBOP		99
 #define RISCV_ISA_EXT_SVRSW60T59B	100
+#define RISCV_ISA_EXT_ZALASR		101
 
 #define RISCV_ISA_EXT_XLINUXENVCFG	127
 

arch/riscv/include/asm/hwprobe.h

@@ -8,7 +8,7 @@
 
 #include <uapi/asm/hwprobe.h>
 
-#define RISCV_HWPROBE_MAX_KEY 14
+#define RISCV_HWPROBE_MAX_KEY 15
 
 static inline bool riscv_hwprobe_key_is_valid(__s64 key)
 {

arch/riscv/include/asm/insn-def.h

@@ -179,6 +179,7 @@
 #define RV___RS1(v)		__RV_REG(v)
 #define RV___RS2(v)		__RV_REG(v)
 
+#define RV_OPCODE_AMO		RV_OPCODE(47)
 #define RV_OPCODE_MISC_MEM	RV_OPCODE(15)
 #define RV_OPCODE_OP_IMM	RV_OPCODE(19)
 #define RV_OPCODE_SYSTEM	RV_OPCODE(115)
@@ -208,6 +209,84 @@
 	__ASM_STR(.error "hlv.d requires 64-bit support")
 #endif
 
+#define LB_AQ(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(0), FUNC7(26),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define LB_AQRL(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(0), FUNC7(27),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define LH_AQ(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(1), FUNC7(26),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define LH_AQRL(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(1), FUNC7(27),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define LW_AQ(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(2), FUNC7(26),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define LW_AQRL(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(2), FUNC7(27),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define SB_RL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(0), FUNC7(29),			\
+	       __RD(0), RS1(addr), RS2(src))
+
+#define SB_AQRL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(0), FUNC7(31),			\
+	       __RD(0), RS1(addr), RS2(src))
+
+#define SH_RL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(1), FUNC7(29),			\
+	       __RD(0), RS1(addr), RS2(src))
+
+#define SH_AQRL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(1), FUNC7(31),			\
+	       __RD(0), RS1(addr), RS2(src))
+
+#define SW_RL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(2), FUNC7(29),			\
+	       __RD(0), RS1(addr), RS2(src))
+
+#define SW_AQRL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(2), FUNC7(31),			\
+	       __RD(0), RS1(addr), RS2(src))
+
+#ifdef CONFIG_64BIT
+#define LD_AQ(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(3), FUNC7(26),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define LD_AQRL(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(3), FUNC7(27),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define SD_RL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(3), FUNC7(29),			\
+	       __RD(0), RS1(addr), RS2(src))
+
+#define SD_AQRL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(3), FUNC7(31),			\
+	       __RD(0), RS1(addr), RS2(src))
+#else
+#define LD_AQ(dest, addr)					\
+	__ASM_STR(.error "ld.aq requires 64-bit support")
+
+#define LD_AQRL(dest, addr)					\
+	__ASM_STR(.error "ld.aqrl requires 64-bit support")
+
+#define SD_RL(dest, addr)					\
+	__ASM_STR(.error "sd.rl requires 64-bit support")
+
+#define SD_AQRL(dest, addr)					\
+	__ASM_STR(.error "sd.aqrl requires 64-bit support")
+#endif
+
 #define SINVAL_VMA(vaddr, asid)					\
 	INSN_R(OPCODE_SYSTEM, FUNC3(0), FUNC7(11),		\
 	       __RD(0), RS1(vaddr), RS2(asid))

arch/riscv/include/asm/pgtable.h

@@ -567,8 +567,13 @@ static inline void update_mmu_cache_range(struct vm_fault *vmf,
 		struct vm_area_struct *vma, unsigned long address,
 		pte_t *ptep, unsigned int nr)
 {
-	asm goto(ALTERNATIVE("nop", "j %l[svvptc]", 0, RISCV_ISA_EXT_SVVPTC, 1)
-		 : : : : svvptc);
+	/*
+	 * Svvptc guarantees that the new valid pte will be visible within
+	 * a bounded timeframe, so when the uarch does not cache invalid
+	 * entries, we don't have to do anything.
+	 */
+	if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SVVPTC))
+		return;
 
 	/*
 	 * The kernel assumes that TLBs don't cache invalid entries, but
@@ -580,12 +585,6 @@ static inline void update_mmu_cache_range(struct vm_fault *vmf,
 	while (nr--)
 		local_flush_tlb_page(address + nr * PAGE_SIZE);
 
-svvptc:;
-	/*
-	 * Svvptc guarantees that the new valid pte will be visible within
-	 * a bounded timeframe, so when the uarch does not cache invalid
-	 * entries, we don't have to do anything.
-	 */
 }
 #define update_mmu_cache(vma, addr, ptep) \
 	update_mmu_cache_range(NULL, vma, addr, ptep, 1)

arch/riscv/include/asm/vector.h

@@ -51,6 +51,7 @@ void put_cpu_vector_context(void);
 void riscv_v_thread_free(struct task_struct *tsk);
 void __init riscv_v_setup_ctx_cache(void);
 void riscv_v_thread_alloc(struct task_struct *tsk);
+void __init update_regset_vector_info(unsigned long size);
 
 static inline u32 riscv_v_flags(void)
 {

arch/riscv/include/uapi/asm/hwprobe.h

@@ -82,6 +82,8 @@ struct riscv_hwprobe {
 #define		RISCV_HWPROBE_EXT_ZAAMO		(1ULL << 56)
 #define		RISCV_HWPROBE_EXT_ZALRSC	(1ULL << 57)
 #define		RISCV_HWPROBE_EXT_ZABHA		(1ULL << 58)
+#define		RISCV_HWPROBE_EXT_ZALASR	(1ULL << 59)
+#define		RISCV_HWPROBE_EXT_ZICBOP	(1ULL << 60)
 #define RISCV_HWPROBE_KEY_CPUPERF_0	5
 #define		RISCV_HWPROBE_MISALIGNED_UNKNOWN	(0 << 0)
 #define		RISCV_HWPROBE_MISALIGNED_EMULATED	(1 << 0)
@@ -107,6 +109,7 @@ struct riscv_hwprobe {
 #define RISCV_HWPROBE_KEY_ZICBOM_BLOCK_SIZE	12
 #define RISCV_HWPROBE_KEY_VENDOR_EXT_SIFIVE_0	13
 #define RISCV_HWPROBE_KEY_VENDOR_EXT_MIPS_0	14
+#define RISCV_HWPROBE_KEY_ZICBOP_BLOCK_SIZE	15
 /* Increase RISCV_HWPROBE_MAX_KEY when adding items. */
 
 /* Flags */

arch/riscv/kernel/cpufeature.c

@@ -472,6 +472,7 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
 	__RISCV_ISA_EXT_DATA(zaamo, RISCV_ISA_EXT_ZAAMO),
 	__RISCV_ISA_EXT_DATA(zabha, RISCV_ISA_EXT_ZABHA),
 	__RISCV_ISA_EXT_DATA(zacas, RISCV_ISA_EXT_ZACAS),
+	__RISCV_ISA_EXT_DATA(zalasr, RISCV_ISA_EXT_ZALASR),
 	__RISCV_ISA_EXT_DATA(zalrsc, RISCV_ISA_EXT_ZALRSC),
 	__RISCV_ISA_EXT_DATA(zawrs, RISCV_ISA_EXT_ZAWRS),
 	__RISCV_ISA_EXT_DATA_VALIDATE(zfa, RISCV_ISA_EXT_ZFA, riscv_ext_f_depends),

arch/riscv/kernel/ptrace.c

@@ -153,6 +153,17 @@ static int riscv_vr_set(struct task_struct *target,
 				 0, riscv_v_vsize);
 	return ret;
 }
+
+static int riscv_vr_active(struct task_struct *target, const struct user_regset *regset)
+{
+	if (!(has_vector() || has_xtheadvector()))
+		return -ENODEV;
+
+	if (!riscv_v_vstate_query(task_pt_regs(target)))
+		return 0;
+
+	return regset->n;
+}
 #endif
 
 #ifdef CONFIG_RISCV_ISA_SUPM
@@ -184,7 +195,7 @@ static int tagged_addr_ctrl_set(struct task_struct *target,
 }
 #endif
 
-static const struct user_regset riscv_user_regset[] = {
+static struct user_regset riscv_user_regset[] __ro_after_init = {
 	[REGSET_X] = {
 		USER_REGSET_NOTE_TYPE(PRSTATUS),
 		.n = ELF_NGREG,
@@ -207,11 +218,10 @@ static const struct user_regset riscv_user_regset[] = {
 	[REGSET_V] = {
 		USER_REGSET_NOTE_TYPE(RISCV_VECTOR),
 		.align = 16,
-		.n = ((32 * RISCV_MAX_VLENB) +
-		      sizeof(struct __riscv_v_regset_state)) / sizeof(__u32),
 		.size = sizeof(__u32),
 		.regset_get = riscv_vr_get,
 		.set = riscv_vr_set,
+		.active = riscv_vr_active,
 	},
 #endif
 #ifdef CONFIG_RISCV_ISA_SUPM
@@ -233,6 +243,14 @@ static const struct user_regset_view riscv_user_native_view = {
 	.n = ARRAY_SIZE(riscv_user_regset),
 };
 
+#ifdef CONFIG_RISCV_ISA_V
+void __init update_regset_vector_info(unsigned long size)
+{
+	riscv_user_regset[REGSET_V].n = (size + sizeof(struct __riscv_v_regset_state)) /
+					sizeof(__u32);
+}
+#endif
+
 struct pt_regs_offset {
 	const char *name;
 	int offset;

arch/riscv/kernel/smpboot.c

@@ -39,7 +39,9 @@
 
 #include "head.h"
 
+#ifndef CONFIG_HOTPLUG_PARALLEL
 static DECLARE_COMPLETION(cpu_running);
+#endif
 
 void __init smp_prepare_cpus(unsigned int max_cpus)
 {
@@ -179,6 +181,12 @@ static int start_secondary_cpu(int cpu, struct task_struct *tidle)
 	return -EOPNOTSUPP;
 }
 
+#ifdef CONFIG_HOTPLUG_PARALLEL
+int arch_cpuhp_kick_ap_alive(unsigned int cpu, struct task_struct *tidle)
+{
+	return start_secondary_cpu(cpu, tidle);
+}
+#else
 int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 {
 	int ret = 0;
@@ -199,6 +207,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 
 	return ret;
 }
+#endif
 
 void __init smp_cpus_done(unsigned int max_cpus)
 {
@@ -225,6 +234,10 @@ asmlinkage __visible void smp_callin(void)
 	mmgrab(mm);
 	current->active_mm = mm;
 
+#ifdef CONFIG_HOTPLUG_PARALLEL
+	cpuhp_ap_sync_alive();
+#endif
+
 	store_cpu_topology(curr_cpuid);
 	notify_cpu_starting(curr_cpuid);
 
@@ -243,7 +256,9 @@ asmlinkage __visible void smp_callin(void)
 	 */
 	local_flush_icache_all();
 	local_flush_tlb_all();
+#ifndef CONFIG_HOTPLUG_PARALLEL
 	complete(&cpu_running);
+#endif
 	/*
 	 * Disable preemption before enabling interrupts, so we don't try to
 	 * schedule a CPU that hasn't actually started yet.

arch/riscv/kernel/sys_hwprobe.c

@@ -109,6 +109,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
 		EXT_KEY(ZAAMO);
 		EXT_KEY(ZABHA);
 		EXT_KEY(ZACAS);
+		EXT_KEY(ZALASR);
 		EXT_KEY(ZALRSC);
 		EXT_KEY(ZAWRS);
 		EXT_KEY(ZBA);
@@ -122,6 +123,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
 		EXT_KEY(ZCB);
 		EXT_KEY(ZCMOP);
 		EXT_KEY(ZICBOM);
+		EXT_KEY(ZICBOP);
 		EXT_KEY(ZICBOZ);
 		EXT_KEY(ZICNTR);
 		EXT_KEY(ZICOND);
@@ -302,6 +304,11 @@ static void hwprobe_one_pair(struct riscv_hwprobe *pair,
 		if (hwprobe_ext0_has(cpus, RISCV_HWPROBE_EXT_ZICBOM))
 			pair->value = riscv_cbom_block_size;
 		break;
+	case RISCV_HWPROBE_KEY_ZICBOP_BLOCK_SIZE:
+		pair->value = 0;
+		if (hwprobe_ext0_has(cpus, RISCV_HWPROBE_EXT_ZICBOP))
+			pair->value = riscv_cbop_block_size;
+		break;
 	case RISCV_HWPROBE_KEY_HIGHEST_VIRT_ADDRESS:
 		pair->value = user_max_virt_addr();
 		break;

arch/riscv/kernel/vector.c

@@ -66,6 +66,8 @@ void __init riscv_v_setup_ctx_cache(void)
 	if (!(has_vector() || has_xtheadvector()))
 		return;
 
+	update_regset_vector_info(riscv_v_vsize);
+
 	riscv_v_user_cachep = kmem_cache_create_usercopy("riscv_vector_ctx",
 							 riscv_v_vsize, 16, SLAB_PANIC,
 							 0, riscv_v_vsize, NULL);

arch/riscv/lib/csum.c

@@ -40,20 +40,11 @@ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
 	uproto = (__force unsigned int)htonl(proto);
 	sum += uproto;
 
-	if (IS_ENABLED(CONFIG_RISCV_ISA_ZBB) && IS_ENABLED(CONFIG_TOOLCHAIN_HAS_ZBB)) {
+	if (IS_ENABLED(CONFIG_RISCV_ISA_ZBB) &&
+	    IS_ENABLED(CONFIG_TOOLCHAIN_HAS_ZBB) &&
+	    riscv_has_extension_likely(RISCV_ISA_EXT_ZBB)) {
 		unsigned long fold_temp;
 
-		/*
-		 * Zbb is likely available when the kernel is compiled with Zbb
-		 * support, so nop when Zbb is available and jump when Zbb is
-		 * not available.
-		 */
-		asm goto(ALTERNATIVE("j %l[no_zbb]", "nop", 0,
-					      RISCV_ISA_EXT_ZBB, 1)
-				  :
-				  :
-				  :
-				  : no_zbb);
 		asm(".option push					\n\
 		.option arch,+zbb					\n\
 			rori	%[fold_temp], %[sum], 32		\n\
@@ -66,7 +57,7 @@ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
 		: [sum] "+r" (sum), [fold_temp] "=&r" (fold_temp));
 		return (__force __sum16)(sum >> 16);
 	}
-no_zbb:
+
 	sum += ror64(sum, 32);
 	sum >>= 32;
 	return csum_fold((__force __wsum)sum);
@@ -152,21 +143,11 @@ do_csum_with_alignment(const unsigned char *buff, int len)
 	csum = do_csum_common(ptr, end, data);
 
 #ifdef CC_HAS_ASM_GOTO_TIED_OUTPUT
-	if (IS_ENABLED(CONFIG_RISCV_ISA_ZBB) && IS_ENABLED(CONFIG_TOOLCHAIN_HAS_ZBB)) {
+	if (IS_ENABLED(CONFIG_RISCV_ISA_ZBB) &&
+	    IS_ENABLED(CONFIG_TOOLCHAIN_HAS_ZBB) &&
+	    riscv_has_extension_likely(RISCV_ISA_EXT_ZBB)) {
 		unsigned long fold_temp;
 
-		/*
-		 * Zbb is likely available when the kernel is compiled with Zbb
-		 * support, so nop when Zbb is available and jump when Zbb is
-		 * not available.
-		 */
-		asm goto(ALTERNATIVE("j %l[no_zbb]", "nop", 0,
-					      RISCV_ISA_EXT_ZBB, 1)
-				  :
-				  :
-				  :
-				  : no_zbb);
-
 #ifdef CONFIG_32BIT
 		asm_goto_output(".option push			\n\
 		.option arch,+zbb				\n\
@@ -204,7 +185,7 @@ do_csum_with_alignment(const unsigned char *buff, int len)
 end:
 		return csum >> 16;
 	}
-no_zbb:
+
 #endif /* CC_HAS_ASM_GOTO_TIED_OUTPUT */
 #ifndef CONFIG_32BIT
 	csum += ror64(csum, 32);
@@ -234,21 +215,11 @@ do_csum_no_alignment(const unsigned char *buff, int len)
 	end = (const unsigned long *)(buff + len);
 	csum = do_csum_common(ptr, end, data);
 
-	if (IS_ENABLED(CONFIG_RISCV_ISA_ZBB) && IS_ENABLED(CONFIG_TOOLCHAIN_HAS_ZBB)) {
+	if (IS_ENABLED(CONFIG_RISCV_ISA_ZBB) &&
+	    IS_ENABLED(CONFIG_TOOLCHAIN_HAS_ZBB) &&
+	    riscv_has_extension_likely(RISCV_ISA_EXT_ZBB)) {
 		unsigned long fold_temp;
 
-		/*
-		 * Zbb is likely available when the kernel is compiled with Zbb
-		 * support, so nop when Zbb is available and jump when Zbb is
-		 * not available.
-		 */
-		asm goto(ALTERNATIVE("j %l[no_zbb]", "nop", 0,
-					      RISCV_ISA_EXT_ZBB, 1)
-				  :
-				  :
-				  :
-				  : no_zbb);
-
 #ifdef CONFIG_32BIT
 		asm (".option push				\n\
 		.option arch,+zbb				\n\
@@ -274,7 +245,7 @@ do_csum_no_alignment(const unsigned char *buff, int len)
 #endif /* !CONFIG_32BIT */
 		return csum >> 16;
 	}
-no_zbb:
+
 #ifndef CONFIG_32BIT
 	csum += ror64(csum, 32);
 	csum >>= 32;

arch/riscv/mm/init.c

@@ -441,7 +441,7 @@ static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
 
 static phys_addr_t __meminit alloc_pte_late(uintptr_t va)
 {
-	struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0);
+	struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL, 0);
 
 	/*
 	 * We do not know which mm the PTE page is associated to at this point.
@@ -526,7 +526,7 @@ static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
 
 static phys_addr_t __meminit alloc_pmd_late(uintptr_t va)
 {
-	struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0);
+	struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL, 0);
 
 	/* See comment in alloc_pte_late() regarding NULL passed the ctor */
 	BUG_ON(!ptdesc || !pagetable_pmd_ctor(NULL, ptdesc));