Commit 9988df07 authored by Mete Durlu's avatar Mete Durlu Committed by Alexander Gordeev
Browse files

s390/topology: Improve topology detection 



Add early polarization detection instead of assuming horizontal
polarization.

Signed-off-by: default avatarMete Durlu <meted@linux.ibm.com>
Reviewed-by: default avatarHeiko Carstens <hca@linux.ibm.com>
Signed-off-by: default avatarAlexander Gordeev <agordeev@linux.ibm.com>
parent 03b3e82a

arch/s390/kernel/topology.c

+11 −0
Original line number Diff line number Diff line
@@ -556,6 +556,16 @@ static void __init alloc_masks(struct sysinfo_15_1_x *info, 
	}

}



static int __init detect_polarization(union topology_entry *tle)

{

	struct topology_core *tl_core;



	while (tle->nl)

		tle = next_tle(tle);

	tl_core = (struct topology_core *)tle;

	return tl_core->pp != POLARIZATION_HRZ;

}



void __init topology_init_early(void)

{

	struct sysinfo_15_1_x *info;
@@ -575,6 +585,7 @@ void __init topology_init_early(void) 
		      __func__, PAGE_SIZE, PAGE_SIZE);

	info = tl_info;

	store_topology(info);

	cpu_management = detect_polarization(info->tle);

	pr_info("The CPU configuration topology of the machine is: %d %d %d %d %d %d / %d\n",

		info->mag[0], info->mag[1], info->mag[2], info->mag[3],

		info->mag[4], info->mag[5], info->mnest);