[PATCH] riscv: fix multi-letter extension compare

[Nikita Shubin]

From: Nikita Shubin <n.shubin@xxxxxxxxx>

Increment ext pointer to match letters after 'z' character, so it points
to actual extension name.

Fixes: 4905ec2fb7e6 ("RISC-V: Add sscofpmf extension support")
Signed-off-by: Nikita Shubin <n.shubin@xxxxxxxxx>
---
Hello Atish,

Sorry to blame you, but i double checked this and i don't see a way 
how extensions from device tree could be successfully matched with 
encoded ones without incrementing the ext pointer or prepending 
the encoded extensions with 'z' letter.

I have no idea how this could slip through review - am i missing something ?
---
 arch/riscv/kernel/cpufeature.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 3b5583db9d80..031546052dc0 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -199,6 +199,7 @@ void __init riscv_fill_hwcap(void)
 				this_hwcap |= isa2hwcap[(unsigned char)(*ext)];
 				set_bit(*ext - 'a', this_isa);
 			} else {
+				ext++;
 				SET_ISA_EXT_MAP("sscofpmf", RISCV_ISA_EXT_SSCOFPMF);
 				SET_ISA_EXT_MAP("svpbmt", RISCV_ISA_EXT_SVPBMT);
 				SET_ISA_EXT_MAP("zicbom", RISCV_ISA_EXT_ZICBOM);
-- 
2.35.1