From 8121cf312a1908f67173ec3773da1688e04437e7 Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Thu, 20 Jun 2013 14:02:21 +0100 Subject: [PATCH] ARM: 7766/1: versatile: don't mark pen as __INIT When booting fewer cores than are physically present on a versatile platform (e.g. when passing maxcpus=N on the command line), some secondary cores may remain in the holding pen, which is marked __INIT, as each CPU's gic cpumask is initialised to 0xff, and thus an IPI to any CPU will wake up *all* secondaries. This behaviour is crucial to the GIC cpumask self-discovery. Late in the boot process, the memory comprising the holding pen will be released to the kernel for more general use, and may be overwritten with arbitrary data, which can cause the held secondaries to start behaving unpredictably. This can lead to all manner of odd behaviour from the kernel. As preventing cpus from entering the pen would require invasive changes to the GIC driver and to existing dts used in the wild, we instead remove the __INIT marker from the pen, keeping it around and leaving the unused secondary CPUs dormant. Link: http://lists.infradead.org/pipermail/linux-arm-kernel/2013-June/175039.html Signed-off-by: Mark Rutland Acked-by: Pawel Moll Acked-by: Nicolas Pitre Cc: Lorenzo Pieralisi Signed-off-by: Russell King --- arch/arm/plat-versatile/headsmp.S | 2 -- 1 file changed, 2 deletions(-) diff --git a/arch/arm/plat-versatile/headsmp.S b/arch/arm/plat-versatile/headsmp.S index b178d44e9eaa..2677bc3762d7 100644 --- a/arch/arm/plat-versatile/headsmp.S +++ b/arch/arm/plat-versatile/headsmp.S @@ -11,8 +11,6 @@ #include #include - __INIT - /* * Realview/Versatile Express specific entry point for secondary CPUs. * This provides a "holding pen" into which all secondary cores are held -- 2.34.1