[PATCH 1/5] sparc64: Report unrecognised machine description hwcap-list entries

[Stian Halseth]

mdesc_cpu_hwcap_list() matches each string in the cpu node's hwcap-list
against hwcaps[] and crypto_hwcaps[]. A string that matches neither is
skipped silently, so firmware can advertise a capability the kernel has
no name for and nothing reports it.

A SPARC T7-1 (M7) emits 28 entries, of which eight match nothing:

    vis3b pause-nsec mwait sparc5 cfr mont xmpmul xmont

Print the ones that are not recognised.

Signed-off-by: Stian Halseth <stian@xxxxxx>
---
 arch/sparc/kernel/setup_64.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index 63615f5c99b47..8ed65ad0e6081 100644
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -488,20 +488,28 @@ static unsigned long __init mdesc_cpu_hwcap_list(void)
 
 	while (len) {
 		int i, plen;
+		bool known = false;
 
 		for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
 			unsigned long bit = 1UL << i;
 
 			if (hwcaps[i] && !strcmp(prop, hwcaps[i])) {
 				caps |= bit;
+				known = true;
 				break;
 			}
 		}
 		for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
-			if (!strcmp(prop, crypto_hwcaps[i]))
+			if (!strcmp(prop, crypto_hwcaps[i])) {
 				caps |= HWCAP_SPARC_CRYPTO;
+				known = true;
+			}
 		}
 
+		if (!known)
+			pr_info("CPU CAPS: unknown hwcap-list entry '%s'\n",
+				prop);
+
 		plen = strlen(prop) + 1;
 		prop += plen;
 		len -= plen;
-- 
2.43.0