| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Fri, 13 Feb 2009 15:51:24 +0100
From: Andreas Herrmann <andreas.herrmann3@....com>
To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
CC: linux-kernel@...r.kernel.org
Subject: [PATCH 2/7] x86: memtest: introduce array to store memtest patterns
Impact: code cleanup
Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>
---
arch/x86/mm/memtest.c | 61 ++++++++++++++++++------------------------------
1 files changed, 23 insertions(+), 38 deletions(-)
diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c
index 00b8bdc..a8a6c51 100644
--- a/arch/x86/mm/memtest.c
+++ b/arch/x86/mm/memtest.c
@@ -9,47 +9,29 @@
#include <asm/e820.h>
-#define _MAX_MEM_PATTERNS 4
+static unsigned long patterns[] = {
+ 0UL,
+ -1UL,
+#ifdef CONFIG_X86_64
+ 0x5555555555555555UL,
+ 0xaaaaaaaaaaaaaaaaUL,
+#else
+ 0x55555555UL,
+ 0xaaaaaaaaUL,
+#endif
+};
static void __init memtest(unsigned long start_phys, unsigned long size,
- unsigned pattern)
+ unsigned long pattern)
{
unsigned long i;
unsigned long *start;
unsigned long start_bad;
unsigned long last_bad;
- unsigned long val;
unsigned long start_phys_aligned;
unsigned long count;
unsigned long incr;
- pattern = pattern % _MAX_MEM_PATTERNS;
-
- switch (pattern) {
- case 0:
- val = 0UL;
- break;
- case 1:
- val = -1UL;
- break;
- case 2:
-#ifdef CONFIG_X86_64
- val = 0x5555555555555555UL;
-#else
- val = 0x55555555UL;
-#endif
- break;
- case 3:
-#ifdef CONFIG_X86_64
- val = 0xaaaaaaaaaaaaaaaaUL;
-#else
- val = 0xaaaaaaaaUL;
-#endif
- break;
- default:
- return;
- }
-
incr = sizeof(unsigned long);
start_phys_aligned = ALIGN(start_phys, incr);
count = (size - (start_phys_aligned - start_phys))/incr;
@@ -58,15 +40,16 @@ static void __init memtest(unsigned long start_phys, unsigned long size,
last_bad = 0;
for (i = 0; i < count; i++)
- start[i] = val;
+ start[i] = pattern;
for (i = 0; i < count; i++, start++, start_phys_aligned += incr) {
- if (*start != val) {
+ if (*start != pattern) {
if (start_phys_aligned == last_bad + incr) {
last_bad += incr;
} else {
if (start_bad) {
printk(KERN_CONT "\n %016lx bad mem addr %010lx - %010lx reserved",
- val, start_bad, last_bad + incr);
+ pattern, start_bad,
+ last_bad + incr);
reserve_early(start_bad, last_bad + incr, "BAD RAM");
}
start_bad = last_bad = start_phys_aligned;
@@ -75,7 +58,7 @@ static void __init memtest(unsigned long start_phys, unsigned long size,
}
if (start_bad) {
printk(KERN_CONT "\n %016lx bad mem addr %010lx - %010lx reserved",
- val, start_bad, last_bad + incr);
+ pattern, start_bad, last_bad + incr);
reserve_early(start_bad, last_bad + incr, "BAD RAM");
}
}
@@ -95,13 +78,16 @@ early_param("memtest", parse_memtest);
void __init early_memtest(unsigned long start, unsigned long end)
{
u64 t_start, t_size;
- unsigned pattern;
+ unsigned int i;
+ unsigned long pattern;
if (!memtest_pattern)
return;
printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern);
- for (pattern = 0; pattern < memtest_pattern; pattern++) {
+ for (i = 0; i < memtest_pattern; i++) {
+ unsigned int idx = i % ARRAY_SIZE(patterns);
+ pattern = patterns[idx];
t_start = start;
t_size = 0;
while (t_start < end) {
@@ -115,8 +101,7 @@ void __init early_memtest(unsigned long start, unsigned long end)
printk(KERN_CONT "\n %010llx - %010llx pattern %d",
(unsigned long long)t_start,
- (unsigned long long)t_start + t_size,
- pattern % _MAX_MEM_PATTERNS);
+ (unsigned long long)t_start + t_size, idx);
memtest(t_start, t_size, pattern);
--
1.6.1.2
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists