From: Joel Stanley Date: Fri, 18 Jul 2014 02:11:37 +0000 (+0930) Subject: powerpc: Disable doorbells on Power8 DD1.x X-Git-Tag: omap-for-v3.17/fixes-against-rc2~241^2~4 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bd6ba3518fcb2539d83163a3f486d09411bc535d;p=pandora-kernel.git powerpc: Disable doorbells on Power8 DD1.x These processors do not currently support doorbell IPIs, so remove them from the feature list if we are at DD 1.xx for the 0x004d part. This fixes a regression caused by d4e58e5928f8 (powerpc/powernv: Enable POWER8 doorbell IPIs). With that patch the kernel would hang at boot when calling smp_call_function_many, as the doorbell would not be received by the target CPUs: .smp_call_function_many+0x2bc/0x3c0 (unreliable) .on_each_cpu_mask+0x30/0x100 .cpuidle_register_driver+0x158/0x1a0 .cpuidle_register+0x2c/0x110 .powernv_processor_idle_init+0x23c/0x2c0 .do_one_initcall+0xd4/0x260 .kernel_init_freeable+0x25c/0x33c .kernel_init+0x1c/0x120 .ret_from_kernel_thread+0x58/0x7c Fixes: d4e58e5928f8 (powerpc/powernv: Enable POWER8 doorbell IPIs) Signed-off-by: Joel Stanley Signed-off-by: Benjamin Herrenschmidt --- Reading git-diff-tree failed