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Return a somewhat sane default value for L2 cache size if cpuid retur… (#1611) 

* Return a somewhat sane default value for L2 cache size if cpuid returned something unexpected

Fixes #1610, the KVM hypervisor on Google Chromebooks returning zero for CPUID  0x80000006, causing DYNAMIC_ARCH
builds of OpenBLAS to hang
This commit is contained in:
Martin Kroeker 2018-06-11 13:26:19 +02:00 committed by GitHub
parent 3313e4b946
commit 6f71c0fce4
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1 changed files with 7 additions and 1 deletions
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8
kernel/setparam-ref.c
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@ -647,7 +647,9 @@ static int get_l2_size_old(void){
return 6144;
}
}
return 0;
// return 0;
fprintf (stderr,"OpenBLAS WARNING - could not determine the L2 cache size on this system, assuming 256k\n");
return 256;
}
#endif
@ -660,6 +662,10 @@ static __inline__ int get_l2_size(void){
l2 = BITMASK(ecx, 16, 0xffff);
#ifndef ARCH_X86
if (l2 <= 0) {
fprintf (stderr,"OpenBLAS WARNING - could not determine the L2 cache size on this system, assuming 256k\n");
return 256;
}
return l2;
#else