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sparc: Fix user_addr_max() definition. 

We need to use TASK_SIZE because for 64-bit tasks the value
of STACK_TOP actually sits in the middle of the address space
so we'll get false-negatives.

Adjust the TASK_SIZE definition on sparc64 to accomodate this,
in the context in which user_addr_max() is used we have the
test_thread_flag() definition available but not the one for
test_tsk_thread_flag().

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-05-24 13:41:58 -07:00
parent 2922585b93
commit c5389831cd
2 changed files with 4 additions and 2 deletions
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4
arch/sparc/include/asm/processor_64.h
View File

@ -42,7 +42,9 @@
#define TASK_SIZE_OF(tsk) \
(test_tsk_thread_flag(tsk,TIF_32BIT) ? \
(1UL << 32UL) : ((unsigned long)-VPTE_SIZE))
#define TASK_SIZE TASK_SIZE_OF(current)
#define TASK_SIZE \
(test_thread_flag(TIF_32BIT) ? \
(1UL << 32UL) : ((unsigned long)-VPTE_SIZE))
#ifdef __KERNEL__
#define STACK_TOP32 ((1UL << 32UL) - PAGE_SIZE)

2
arch/sparc/include/asm/uaccess.h
View File

@ -7,7 +7,7 @@
#endif
#define user_addr_max() \
(segment_eq(get_fs(), USER_DS) ? STACK_TOP : ~0UL)
(segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL)
extern long strncpy_from_user(char *dest, const char __user *src, long count);