From 315fe625f878749a7d2b6b65a40c29bbbe6e1dc7 Mon Sep 17 00:00:00 2001 From: Wu Zhangjin Date: Tue, 1 Dec 2009 14:55:25 +0800 Subject: MIPS: Loongson: Disallow 4kB pages Currently, with PAGE_SIZE_4KB, the kernel for loongson will hang on: Kernel panic - not syncing: Attempted to kill init! The possible reason is the cache aliases problem: Loongson 2F has 64kb, 4 way L1 Cache, the way size is 16kb, which is bigger then 4kb. so, If using 4kb page size, there is cache aliases problem. To avoid this kind of problem, extra cache flushing. The 2nd possible solution is 16kb page size which avoids cache aliases without the need for extra cache flushes. So we disable 4kB pages until the aliasing issue is solved. Signed-off-by: Wu Zhangjin Patchwork: http://patchwork.linux-mips.org/patch/736/ Cc: linux-mips@linux-mips.org Cc: zhangfx@lemote.com Signed-off-by: Ralf Baechle --- arch/mips/Kconfig | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/mips') diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index ffdd651c54b1..e232e50e6a0a 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -1453,6 +1453,7 @@ choice config PAGE_SIZE_4KB bool "4kB" + depends on !CPU_LOONGSON2 help This option select the standard 4kB Linux page size. On some R3000-family processors this is the only available page size. Using -- cgit v1.2.3