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arm64: smp: honour #address-size when parsing CPU reg property 

For systems where the top 32-bits of the MPIDR are all zero, we should
allow the device-tree to specify an #address-size of 0x1 for the CPU reg
property and then zero extend the value there.

Without this patch, kvmtool breaks with the recent mpidr parsing code
introduced in 4c7aa00213 ("arm64: kernel: initialise cpu_logical_map
from the DT").

Acked-by: Javi Merino <javi.merino@arm.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Will Deacon 2013-04-22 18:28:55 +01:00 committed by Catalin Marinas
parent a84b086b87
commit 72aea393a2
1 changed files with 4 additions and 1 deletions
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5
arch/arm64/kernel/smp.c
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@ -270,6 +270,7 @@ void __init smp_init_cpus(void)
bool bootcpu_valid = false;
while ((dn = of_find_node_by_type(dn, "cpu"))) {
const u32 *cell;
u64 hwid;
/*
@ -277,10 +278,12 @@ void __init smp_init_cpus(void)
* considered invalid to build a cpu_logical_map
* entry.
*/
if (of_property_read_u64(dn, "reg", &hwid)) {
cell = of_get_property(dn, "reg", NULL);
if (!cell) {
pr_err("%s: missing reg property\n", dn->full_name);
goto next;
}
hwid = of_read_number(cell, of_n_addr_cells(dn));
/*
* Non affinity bits must be set to 0 in the DT