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

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Date:   Fri, 26 Jul 2019 12:46:37 -0700
From:   Atish Patra <atish.patra@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Atish Patra <atish.patra@....com>,
        Alan Kao <alankao@...estech.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Allison Randal <allison@...utok.net>,
        Anup Patel <anup.patel@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Johan Hovold <johan@...nel.org>,
        linux-riscv@...ts.infradead.org,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 3/4] RISC-V: Support case insensitive ISA string parsing.

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@....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