ARM: bugfix: Features of /proc/cpuinfo is wrong

Array hwcap_str[19] should be "vfpd32" and hwcap_str[20] should be "lpae". But actually "vfpd32" was missing and "lpae" was at wrong place.

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Hello,

The output of features string of /proc/cpuinfo is changed at v3.11-rc1. In case of KZM-A9-GT board, which cpu is ARM Corex-A9

$ grep Features /proc/cpuinfo

Features : swp half thumb fastmult vfp edsp neon vfpv3 tls lpae

This is wrong. Cortex-A9 does not have lpae (Large Physical Address Extension).

I tried git bisect and found this commit is related.

a469abd0f868c902b75532579bf87553dcf1b360
ARM: elf: add new hwcap for identifying atomic ldrd/strd instructions

Variable elf_hwcap = 0x0008b0d7. This seems good.
HWCAP_LPAE (1 << 20) is not set in elf_hwcap.
Finally I found "lpae" string was wrong place in the array hwcap_str[]. hwcap_str[19] should be "vfpd32" and hwcap_str[20] should be "lpae". But actually "vfpd32" was missing and "lpae" was@wrong place.

After this patch, features of /proc/cpuinfo of the same board is

Features : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpd32

I tested only in Cortex-A9.
Someone, please test on Cortex-A15 or A7. "lpae" should be appeared.

 arch/arm/kernel/setup.c |    1 +
 1 file changed, 1 insertion(+)

index 63af9a7..96286cb 100644
@@ -971,6 +971,7 @@ static const char *hwcap_str[] = {
 	"vfpv4",
 	"idiva",
 	"idivt",
+	"vfpd32",
 	"lpae",
 	NULL
 };

1.7.9.5

[...]

I still can't see this in the patch system. I've tested it on A5, A7, A9 and A15 and it works as expected.

Will