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[PATCH] powerpc: Add support for "linux,usable-memory" on memory nodes 

Milton has proposed that we should support a "linux,usable-memory" property
on memory nodes which describes, in preference to "reg", the regions of memory
Linux should use.

This facility is required for kdump to inform the second kernel which memory
it should use.

Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Ellerman 2005-12-04 18:39:55 +11:00 committed by Paul Mackerras
parent 54c32021eb
commit ba7594852f
2 changed files with 13 additions and 3 deletions
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9
arch/powerpc/kernel/prom.c
View File

@ -567,7 +567,10 @@ static int __init interpret_root_props(struct device_node *np,
unsigned int *rp;
int rpsize = (naddrc + nsizec) * sizeof(unsigned int);
rp = (unsigned int *) get_property(np, "reg", &l);
rp = (unsigned int *) get_property(np, "linux,usable-memory", &l);
if (rp == NULL)
rp = (unsigned int *) get_property(np, "reg", &l);
if (rp != 0 && l >= rpsize) {
i = 0;
adr = (struct address_range *) (*mem_start);
@ -1275,7 +1278,9 @@ static int __init early_init_dt_scan_memory(unsigned long node,
} else if (strcmp(type, "memory") != 0)
return 0;
reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l);
reg = (cell_t *)of_get_flat_dt_prop(node, "linux,usable-memory", &l);
if (reg == NULL)
reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l);
if (reg == NULL)
return 0;

7
arch/powerpc/mm/numa.c
View File

@ -423,7 +423,12 @@ static int __init parse_numa_properties(void)
unsigned int *memcell_buf;
unsigned int len;
memcell_buf = (unsigned int *)get_property(memory, "reg", &len);
memcell_buf = (unsigned int *)get_property(memory,
"linux,usable-memory", &len);
if (!memcell_buf || len <= 0)
memcell_buf =
(unsigned int *)get_property(memory, "reg",
&len);
if (!memcell_buf || len <= 0)
continue;