linux-kernel - [PATCH v3 21/21] sparc64: use match

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Date:   Wed, 6 Jun 2018 10:19:11 +0800
From:   Yisheng Xie <xieyisheng1@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <andy.shevchenko@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Anthony Yznaga <anthony.yznaga@...cle.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        <sparclinux@...r.kernel.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH v3 21/21] sparc64: use match_string() helper

match_string() returns the index of an array for a matching string,
which can be used instead of open coded variant.

Cc: "David S. Miller" <davem@...emloft.net>
Cc: Anthony Yznaga <anthony.yznaga@...cle.com>
Cc: Pavel Tatashin <pasha.tatashin@...cle.com>
Cc: sparclinux@...r.kernel.org
Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
---
v3:
 - add string literal instead of NULL for array hwcaps to make it
   can use match_string() too.  - per Andy
v2
 - new add for use match_string() helper patchset.

 arch/sparc/kernel/setup_64.c | 23 +++++++++--------------
 1 file changed, 9 insertions(+), 14 deletions(-)

diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index 7944b3c..4f0ec0c 100644
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -401,7 +401,7 @@ void __init start_early_boot(void)
 	 */
 	"mul32", "div32", "fsmuld", "v8plus", "popc", "vis", "vis2",
 	"ASIBlkInit", "fmaf", "vis3", "hpc", "random", "trans", "fjfmau",
-	"ima", "cspare", "pause", "cbcond", NULL /*reserved for crypto */,
+	"ima", "cspare", "pause", "cbcond", "resv" /*reserved for crypto */,
 	"adp",
 };

@@ -418,7 +418,7 @@ void cpucap_info(struct seq_file *m)
 	seq_puts(m, "cpucaps\t\t: ");
 	for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
 		unsigned long bit = 1UL << i;
-		if (hwcaps[i] && (caps & bit)) {
+		if (bit != HWCAP_SPARC_CRYPTO && (caps & bit)) {
 			seq_printf(m, "%s%s",
 				   printed ? "," : "", hwcaps[i]);
 			printed++;
@@ -472,7 +472,7 @@ static void __init report_hwcaps(unsigned long caps)

 	for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
 		unsigned long bit = 1UL << i;
-		if (hwcaps[i] && (caps & bit))
+		if (bit != HWCAP_SPARC_CRYPTO && (caps & bit))
 			report_one_hwcap(&printed, hwcaps[i]);
 	}
 	if (caps & HWCAP_SPARC_CRYPTO)
@@ -504,18 +504,13 @@ static unsigned long __init mdesc_cpu_hwcap_list(void)
 	while (len) {
 		int i, plen;

-		for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
-			unsigned long bit = 1UL << i;
+		i = match_string(hwcaps, ARRAY_SIZE(hwcaps), prop);
+		if (i >= 0)
+			caps |= (1UL << i);

-			if (hwcaps[i] && !strcmp(prop, hwcaps[i])) {
-				caps |= bit;
-				break;
-			}
-		}
-		for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
-			if (!strcmp(prop, crypto_hwcaps[i]))
-				caps |= HWCAP_SPARC_CRYPTO;
-		}
+		i = match_string(crypto_hwcaps, ARRAY_SIZE(crypto_hwcaps), prop);
+		if (i >= 0)
+			caps |= HWCAP_SPARC_CRYPTO;

 		plen = strlen(prop) + 1;
 		prop += plen;
-- 
1.7.12.4