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[SPARC64]: Simplify user fault fixup handling.

Browse source 
Instead of doing byte-at-a-time user accesses to figure
out where the fault occurred, read the saved fault_address
from the current thread structure.

For the sake of defensive programming, if the fault_address
does not fall into the user buffer range, simply assume the
whole area faulted.  This will cause the fixup for
copy_from_user() to clear the entire kernel side buffer.

Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
David S. Miller 2005-09-28 21:06:47 -07:00
commit efdc1e2083
3 changed files with 34 additions and 45 deletions
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6
include/asm-sparc64/uaccess.h
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@ -251,7 +251,7 @@ copy_from_user(void *to, const void __user *from, unsigned long size)
{
unsigned long ret = ___copy_from_user(to, from, size);
if (ret)
if (unlikely(ret))
ret = copy_from_user_fixup(to, from, size);
return ret;
}
@ -267,7 +267,7 @@ copy_to_user(void __user *to, const void *from, unsigned long size)
{
unsigned long ret = ___copy_to_user(to, from, size);
if (ret)
if (unlikely(ret))
ret = copy_to_user_fixup(to, from, size);
return ret;
}
@ -283,7 +283,7 @@ copy_in_user(void __user *to, void __user *from, unsigned long size)
{
unsigned long ret = ___copy_in_user(to, from, size);
if (ret)
if (unlikely(ret))
ret = copy_in_user_fixup(to, from, size);
return ret;
}