From: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Subject: powerpc: Fix up the kdump base cap to 128M
Git-commit: e641eb03ab2b0f065fa5e64b4202fb5b0441b427
Patch-mainline: v3.13-rc7
References: bnc#874784 

    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 <mahesh@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Torsten Duwe <duwe@suse.de>

 arch/powerpc/kernel/machine_kexec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c
index 88a7fb4..75d4f73 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
