Re: [PATCH] [powerpc] Export memory limit via device tree
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2012-07-11 05:37:13
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diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c index c957b12..0c9695d 100644 --- a/arch/powerpc/kernel/machine_kexec.c +++ b/arch/powerpc/kernel/machine_kexec.c@@ -207,6 +207,12 @@ static struct property crashk_size_prop = { .value = &crashk_size, }; +static struct property memory_limit_prop = { + .name = "linux,memory-limit", + .length = sizeof(phys_addr_t), + .value = &memory_limit, +}; +
AFAIK. phys_addr_t can change size, so instead make it point to a known fixes size quantity (a u64).
+ + /* memory-limit is needed for constructing the crash regions */ + prop = of_find_property(node, memory_limit_prop.name, NULL); + if (prop) + prom_remove_property(node, prop); + + if (memory_limit) + prom_add_property(node, &memory_limit_prop); +
There's a patch floating around making prom_update_property properly handle both pre-existing and non-pre-existing props, you should probably base yourself on top of it. I'm about to stick that patch in powerpc -next Cheers, Ben.