From 690d097c00c88fa9d93d198591e184164b1d8c20 Mon Sep 17 00:00:00 2001 From: Helge Deller Date: Fri, 7 Oct 2016 18:19:55 +0200 Subject: parisc: Increase KERNEL_INITIAL_SIZE for 32-bit SMP kernels Increase the initial kernel default page mapping size for SMP kernels to 32MB and add a runtime check which panics early if the kernel is bigger than the initial mapping size. This fixes boot crashes of 32bit SMP kernels. Due to the introduction of huge page support in kernel 4.4 and it's required initial kernel layout in memory, a 32bit SMP kernel usually got bigger (in layout, not size) than 16MB. Cc: stable@vger.kernel.org #4.4+ Signed-off-by: Helge Deller --- arch/parisc/kernel/setup.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'arch/parisc/kernel/setup.c') diff --git a/arch/parisc/kernel/setup.c b/arch/parisc/kernel/setup.c index f7ea626e29c9..81d6f6391944 100644 --- a/arch/parisc/kernel/setup.c +++ b/arch/parisc/kernel/setup.c @@ -38,6 +38,7 @@ #include #include +#include #include #include #include /* for pa7300lc_init() proto */ @@ -140,6 +141,13 @@ void __init setup_arch(char **cmdline_p) #endif printk(KERN_CONT ".\n"); + /* + * Check if initial kernel page mappings are sufficient. + * panic early if not, else we may access kernel functions + * and variables which can't be reached. + */ + if (__pa((unsigned long) &_end) >= KERNEL_INITIAL_SIZE) + panic("KERNEL_INITIAL_ORDER too small!"); pdc_console_init(); -- cgit v1.2.3-59-g8ed1b