Hello,
early_memtest() is being executed on many platforms even though they dont enable
CONFIG_MEMTEST by default. Just being curious how the following set of patterns
got decided. Are they just random 64 bit patterns ? Or there is some particular
significance to them in detecting bad memory.
static u64 patterns[] __initdata = {
/* The first entry has to be 0 to leave memtest with zeroed memory */
0,
0xffffffffffffffffULL,
0x5555555555555555ULL,
0xaaaaaaaaaaaaaaaaULL,
0x1111111111111111ULL,
0x2222222222222222ULL,
0x4444444444444444ULL,
0x8888888888888888ULL,
0x3333333333333333ULL,
0x6666666666666666ULL,
0x9999999999999999ULL,
0xccccccccccccccccULL,
0x7777777777777777ULL,
0xbbbbbbbbbbbbbbbbULL,
0xddddddddddddddddULL,
0xeeeeeeeeeeeeeeeeULL,
0x7a6c7258554e494cULL, /* yeah ;-) */
};
BTW what about the last one here. Most of them got moved from x86 through the
commit 63823126c221dd ("x86: memtest: add additional (regular) test patterns").
- Anshuman
