diff options
author | Andreas Herrmann <andreas.herrmann3@amd.com> | 2009-02-25 10:26:18 (GMT) |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2009-02-25 11:19:44 (GMT) |
commit | 40823f737e5bd186a1156fb1c28f360260e1e084 (patch) | |
tree | 67fc9fe9752ad585e6e2c5b13086c98820ddd75c /arch/x86/mm/memtest.c | |
parent | a852cbfaaf8122827602027b1614971cfd832304 (diff) | |
download | linux-fsl-qoriq-40823f737e5bd186a1156fb1c28f360260e1e084.tar.xz |
x86: memtest: reuse test patterns when memtest parameter exceeds number of available patterns
Impact: fix unexpected behaviour when pattern number is out of range
Current implementation provides 4 patterns for memtest. The code doesn't
check whether the memtest parameter value exceeds the maximum pattern number.
Instead the memtest code pretends to test with non-existing patterns, e.g.
when booting with memtest=10 I've observed the following
...
early_memtest: pattern num 10
0000001000 - 0000006000 pattern 0
...
0000001000 - 0000006000 pattern 1
...
0000001000 - 0000006000 pattern 2
...
0000001000 - 0000006000 pattern 3
...
0000001000 - 0000006000 pattern 4
...
0000001000 - 0000006000 pattern 5
...
0000001000 - 0000006000 pattern 6
...
0000001000 - 0000006000 pattern 7
...
0000001000 - 0000006000 pattern 8
...
0000001000 - 0000006000 pattern 9
...
But in fact Linux didn't test anything for patterns > 4 as the default
case in memtest() is to leave the function.
I suggest to use the memtest parameter as the number of tests to be
performed and to re-iterate over all existing patterns.
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm/memtest.c')
-rw-r--r-- | arch/x86/mm/memtest.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c index 9cab18b..00b8bdc 100644 --- a/arch/x86/mm/memtest.c +++ b/arch/x86/mm/memtest.c @@ -9,6 +9,8 @@ #include <asm/e820.h> +#define _MAX_MEM_PATTERNS 4 + static void __init memtest(unsigned long start_phys, unsigned long size, unsigned pattern) { @@ -21,6 +23,8 @@ static void __init memtest(unsigned long start_phys, unsigned long size, unsigned long count; unsigned long incr; + pattern = pattern % _MAX_MEM_PATTERNS; + switch (pattern) { case 0: val = 0UL; @@ -110,8 +114,9 @@ void __init early_memtest(unsigned long start, unsigned long end) t_size = end - t_start; printk(KERN_CONT "\n %010llx - %010llx pattern %d", - (unsigned long long)t_start, - (unsigned long long)t_start + t_size, pattern); + (unsigned long long)t_start, + (unsigned long long)t_start + t_size, + pattern % _MAX_MEM_PATTERNS); memtest(t_start, t_size, pattern); |