Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc

Pull sparc fixes from David Miller:
 "I didn't want the release to go out without the statx system call
  properly hooked up"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
  sparc: Update syscall tables.
  sparc64: Fill in rest of HAVE_REGS_AND_STACK_ACCESS_API

arch/sparc/Kconfig

@@ -82,6 +82,7 @@ config SPARC64
 	select HAVE_ARCH_AUDITSYSCALL
 	select ARCH_SUPPORTS_ATOMIC_RMW
 	select HAVE_NMI
+	select HAVE_REGS_AND_STACK_ACCESS_API
 
 config ARCH_DEFCONFIG
 	string

arch/sparc/include/asm/ptrace.h

@@ -83,7 +83,8 @@ unsigned long profile_pc(struct pt_regs *);
 
 #define MAX_REG_OFFSET (offsetof(struct pt_regs, magic))
 
-extern int regs_query_register_offset(const char *name);
+int regs_query_register_offset(const char *name);
+unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n);
 
 /**
  * regs_get_register() - get register value from its offset

arch/sparc/include/uapi/asm/unistd.h

@@ -425,8 +425,9 @@
 #define __NR_copy_file_range	357
 #define __NR_preadv2		358
 #define __NR_pwritev2		359
+#define __NR_statx		360
 
-#define NR_syscalls		360
+#define NR_syscalls		361
 
 /* Bitmask values returned from kern_features system call.  */
 #define KERN_FEATURE_MIXED_MODE_STACK	0x00000001
@@ -442,4 +443,9 @@
 #define __IGNORE_getresgid
 #endif
 
+/* Sparc doesn't have protection keys. */
+#define __IGNORE_pkey_mprotect
+#define __IGNORE_pkey_alloc
+#define __IGNORE_pkey_free
+
 #endif /* _UAPI_SPARC_UNISTD_H */

arch/sparc/kernel/ptrace_64.c

@@ -1162,3 +1162,39 @@ int regs_query_register_offset(const char *name)
 			return roff->offset;
 	return -EINVAL;
 }
+
+/**
+ * regs_within_kernel_stack() - check the address in the stack
+ * @regs:	pt_regs which contains kernel stack pointer.
+ * @addr:	address which is checked.
+ *
+ * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
+ * If @addr is within the kernel stack, it returns true. If not, returns false.
+ */
+static inline int regs_within_kernel_stack(struct pt_regs *regs,
+					   unsigned long addr)
+{
+	unsigned long ksp = kernel_stack_pointer(regs) + STACK_BIAS;
+	return ((addr & ~(THREAD_SIZE - 1))  ==
+		(ksp & ~(THREAD_SIZE - 1)));
+}
+
+/**
+ * regs_get_kernel_stack_nth() - get Nth entry of the stack
+ * @regs:	pt_regs which contains kernel stack pointer.
+ * @n:		stack entry number.
+ *
+ * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
+ * is specified by @regs. If the @n th entry is NOT in the kernel stack,
+ * this returns 0.
+ */
+unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
+{
+	unsigned long ksp = kernel_stack_pointer(regs) + STACK_BIAS;
+	unsigned long *addr = (unsigned long *)ksp;
+	addr += n;
+	if (regs_within_kernel_stack(regs, (unsigned long)addr))
+		return *addr;
+	else
+		return 0;
+}

arch/sparc/kernel/systbls_32.S

@@ -89,3 +89,4 @@ sys_call_table:
 /*345*/	.long sys_renameat2, sys_seccomp, sys_getrandom, sys_memfd_create, sys_bpf
 /*350*/	.long sys_execveat, sys_membarrier, sys_userfaultfd, sys_bind, sys_listen
 /*355*/	.long sys_setsockopt, sys_mlock2, sys_copy_file_range, sys_preadv2, sys_pwritev2
+/*360*/	.long sys_statx

arch/sparc/kernel/systbls_64.S

@@ -90,6 +90,7 @@ sys_call_table32:
 	.word sys32_renameat2, sys_seccomp, sys_getrandom, sys_memfd_create, sys_bpf
 /*350*/	.word sys32_execveat, sys_membarrier, sys_userfaultfd, sys_bind, sys_listen
 	.word compat_sys_setsockopt, sys_mlock2, sys_copy_file_range, compat_sys_preadv2, compat_sys_pwritev2
+/*360*/	.word sys_statx
 
 #endif /* CONFIG_COMPAT */
 
@@ -171,3 +172,4 @@ sys_call_table:
 	.word sys_renameat2, sys_seccomp, sys_getrandom, sys_memfd_create, sys_bpf
 /*350*/	.word sys64_execveat, sys_membarrier, sys_userfaultfd, sys_bind, sys_listen
 	.word sys_setsockopt, sys_mlock2, sys_copy_file_range, sys_preadv2, sys_pwritev2
+/*360*/	.word sys_statx