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powerpc: Check that TASK_SIZE does not overlap KERNEL_START 

Make sure CONFIG_TASK_SIZE does not overlap CONFIG_KERNEL_START
This could happen when overriding settings to get 1GB lowmem, and would lead
to userland mysteriousely hanging.

This setting is only used by PPC32.

Signed-off-by: Rune Torgersen <runet@innovsys.com>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Rune Torgersen 2008-05-24 01:59:15 +10:00 committed by Paul Mackerras
parent cec0dd94cf
commit 7c4f10b900
1 changed files with 4 additions and 0 deletions
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4
include/asm-powerpc/processor.h
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@ -81,6 +81,10 @@ extern struct task_struct *last_task_used_altivec;
extern struct task_struct *last_task_used_spe; extern struct task_struct *last_task_used_spe;
#ifdef CONFIG_PPC32 #ifdef CONFIG_PPC32
#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
#error User TASK_SIZE overlaps with KERNEL_START address
#endif
#define TASK_SIZE (CONFIG_TASK_SIZE) #define TASK_SIZE (CONFIG_TASK_SIZE)
/* This decides where the kernel will search for a free chunk of vm /* This decides where the kernel will search for a free chunk of vm