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m68knommu: remove size limit on non-MMU TASK_SIZE

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The TASK_SIZE define is used in some places as a limit on the size of
the virtual address space of a process. On non-MMU systems those addresses
used in comparison will be physical addresses, and they could be anywhere
in the 32bit physical address space. So for !CONFIG_MMU systems set the
TASK_SIZE to the maximum physical address.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
This commit is contained in:
Greg Ungerer 2010-05-24 11:22:05 +10:00
parent 9fcce0baea
commit cc24c40594
1 changed files with 4 additions and 0 deletions
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4
arch/m68k/include/asm/processor.h
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@ -44,11 +44,15 @@ static inline void wrusp(unsigned long usp)
* User space process size: 3.75GB. This is hardcoded into a few places,
* so don't change it unless you know what you are doing.
*/
#ifdef CONFIG_MMU
#ifndef CONFIG_SUN3
#define TASK_SIZE (0xF0000000UL)
#else
#define TASK_SIZE (0x0E000000UL)
#endif
#else
#define TASK_SIZE (0xFFFFFFFFUL)
#endif
#ifdef __KERNEL__
#define STACK_TOP TASK_SIZE