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![]() HAVE_FAST_GUP enables the lockless quick page table walker for simple cases, and is a nice optimization for some random loads that can then use get_user_pages_fast() rather than the more careful page walker. However, for some unexplained reason, it seems to be subtly broken on sparc64. The breakage is only with some compiler versions and some hardware, and nobody seems to have figured out what triggers it, although there's a simple reprodicer for the problem when it does trigger. The problem was introduced with the conversion to the generic GUP code in commit |
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include | ||
kernel | ||
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math-emu | ||
mm | ||
net | ||
oprofile | ||
power | ||
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vdso | ||
Kbuild | ||
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Makefile |