[PATCH 3/4] RISC-V: Support case insensitive ISA string parsing.

[Atish Patra <atish.patra@wdc.com>]

As per riscv specification, ISA naming strings are
case insensitive. However, currently only lower case
strings are parsed during cpu procfs.

Support parsing of upper case letters as well.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
---
 arch/riscv/kernel/cpu.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index 7da3c6a93abd..185143478830 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -5,6 +5,7 @@
 
 #include <linux/init.h>
 #include <linux/seq_file.h>
+#include <linux/ctype.h>
 #include <linux/of.h>
 #include <asm/smp.h>
 
@@ -57,10 +58,10 @@ static void print_isa(struct seq_file *f, const char *orig_isa)
 	 * kernels on harts with the same ISA that the kernel is compiled for.
 	 */
 #if defined(CONFIG_32BIT)
-	if (strncmp(isa, "rv32i", 5) != 0)
+	if (strncasecmp(isa, "rv32i", 5) != 0)
 		return;
 #elif defined(CONFIG_64BIT)
-	if (strncmp(isa, "rv64i", 5) != 0)
+	if (strncasecmp(isa, "rv64i", 5) != 0)
 		return;
 #endif
 
@@ -76,8 +77,8 @@ static void print_isa(struct seq_file *f, const char *orig_isa)
 	 * extension from userspace as it's not accessible from there.
 	 */
 	for (e = ext; *e != '\0'; ++e) {
-		if (isa[0] == e[0]) {
-			if (isa[0] != 's')
+		if (tolower(isa[0]) == e[0]) {
+			if (tolower(isa[0] != 's'))
 				seq_write(f, isa, 1);
 
 			isa++;
-- 
2.21.0