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kernel: kmem_ptr_validate considered harmful

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This is a nasty and error prone API. It is no longer used, remove it.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>
This commit is contained in:
Nick Piggin
2011-01-07 17:49:17 +11:00
parent 786a5e15b6
commit ccd35fb9f4
5 changed files with 1 additions and 99 deletions
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21
mm/util.c
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@@ -186,27 +186,6 @@ void kzfree(const void *p)
}
EXPORT_SYMBOL(kzfree);
int kern_ptr_validate(const void *ptr, unsigned long size)
{
unsigned long addr = (unsigned long)ptr;
unsigned long min_addr = PAGE_OFFSET;
unsigned long align_mask = sizeof(void *) - 1;
if (unlikely(addr < min_addr))
goto out;
if (unlikely(addr > (unsigned long)high_memory - size))
goto out;
if (unlikely(addr & align_mask))
goto out;
if (unlikely(!kern_addr_valid(addr)))
goto out;
if (unlikely(!kern_addr_valid(addr + size - 1)))
goto out;
return 1;
out:
return 0;
}
/*
* strndup_user - duplicate an existing string from user space
* @s: The string to duplicate