From: Mahesh Salgaonkar Date: Mon, 9 Dec 2013 10:03:39 +0000 (+0530) Subject: powerpc: Fix up the kdump base cap to 128M X-Git-Tag: v3.13-rc4~38^2 X-Git-Url: http://pileus.org/git/?a=commitdiff_plain;h=e641eb03ab2b0f065fa5e64b4202fb5b0441b427;p=~andy%2Flinux powerpc: Fix up the kdump base cap to 128M The current logic sets the kdump base to min of 2G or ppc64_rma_size/2. On PowerNV kernel the first memory block 'memory@0' can be very large, equal to the DIMM size with ppc64_rma_size value capped to 1G. Hence on PowerNV, kdump base is set to 512M resulting kdump to fail while allocating paca array. This is because, paca need its memory from RMA region capped at 256M (see allocate_pacas()). This patch lowers the kdump base cap to 128M so that kdump kernel can successfully get memory below 256M for paca allocation. Signed-off-by: Mahesh Salgaonkar Signed-off-by: Benjamin Herrenschmidt --- diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c index 88a7fb458df..75d4f7340da 100644 --- a/arch/powerpc/kernel/machine_kexec.c +++ b/arch/powerpc/kernel/machine_kexec.c @@ -148,7 +148,7 @@ void __init reserve_crashkernel(void) * a small SLB (128MB) since the crash kernel needs to place * itself and some stacks to be in the first segment. */ - crashk_res.start = min(0x80000000ULL, (ppc64_rma_size / 2)); + crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2)); #else crashk_res.start = KDUMP_KERNELBASE; #endif