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powerpc+sparc64/mm: Remove hack in mmap randomize layout

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Since commit 8a0a9bd4db, this comment in mmap_rnd() does not
hold true as the value returned by get_random_int() will in fact be

different every single call. Remove the comment and simplify the code
back to its original desired form.

This reverts commit a5adc91a4b which is no longer necessary and
also fixes the sparc code that copied this same adjustment.

Signed-off-by: Dan McGee <dpmcgee@gmail.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Dan McGee
2011-10-17 13:05:23 +00:00
committed by Benjamin Herrenschmidt
parent 3ce21cdfe9
commit fa8cbaaf5a
2 changed files with 6 additions and 14 deletions
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6
arch/sparc/kernel/sys_sparc_64.c
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@@ -368,11 +368,11 @@ static unsigned long mmap_rnd(void)
if (current->flags & PF_RANDOMIZE) {
unsigned long val = get_random_int();
if (test_thread_flag(TIF_32BIT))
rnd = (val % (1UL << (22UL-PAGE_SHIFT)));
rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
else
rnd = (val % (1UL << (29UL-PAGE_SHIFT)));
rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
}
return (rnd << PAGE_SHIFT) * 2;
return rnd << PAGE_SHIFT;
}
void arch_pick_mmap_layout(struct mm_struct *mm)