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

1 files changed, 12 insertions, 41 deletions

diff --git a/arch/riscv/lib/csum.c b/arch/riscv/lib/csum.c
index 9408f50ca59a..75bd0abffd63 100644
--- a/arch/riscv/lib/csum.c
+++ b/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;