From ba7594852f4e7121b3f037d59f983637b795f0dd Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Sun, 4 Dec 2005 18:39:55 +1100 Subject: [PATCH] [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 Signed-off-by: Michael Ellerman Signed-off-by: Paul Mackerras --- arch/powerpc/kernel/prom.c | 9 +++++++-- arch/powerpc/mm/numa.c | 7 ++++++- 2 files changed, 13 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index fddc9c13bff5..7e798d5b03b4 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -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; diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index 40c99deb691b..97e83f1d1bdb 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -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; -- GitLab