1 files changed, 6 insertions, 3 deletions

diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index 3a5a2ee31547..b4a7d4427fbb 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -64,7 +64,7 @@ int riscv_of_processor_hartid(struct device_node *node)
 
 static void print_isa(struct seq_file *f, const char *orig_isa)
 {
-        static const char *ext = "mafdc";
+        static const char *ext = "mafdcsu";
         const char *isa = orig_isa;
         const char *e;
 
@@ -88,11 +88,14 @@ static void print_isa(struct seq_file *f, const char *orig_isa)
         /*
          * Check the rest of the ISA string for valid extensions, printing those
          * we find.  RISC-V ISA strings define an order, so we only print the
-         * extension bits when they're in order.
+         * extension bits when they're in order. Hide the supervisor (S)
+         * extension from userspace as it's not accessible from there.
          */
         for (e = ext; *e != '\0'; ++e) {
                 if (isa[0] == e[0]) {
-                        seq_write(f, isa, 1);
+                        if (isa[0] != 's')
+                                seq_write(f, isa, 1);
+
                         isa++;
                 }
         }