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| author | Andrea Arcangeli <aarcange@redhat.com> | 2011-01-13 15:47:00 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 17:32:43 -0800 |
| commit | 5f24ce5fd34c3ca1b3d10d30da754732da64d5c0 (patch) | |
| tree | c82d27461f2adda210e77808b7dd04eaec017f2f /arch/x86/include/asm/bitops.h | |
| parent | 21ae5b01750f14140809508a478a4413792e0261 (diff) | |
| download | blackbird-op-linux-5f24ce5fd34c3ca1b3d10d30da754732da64d5c0.tar.gz blackbird-op-linux-5f24ce5fd34c3ca1b3d10d30da754732da64d5c0.zip | |
thp: remove PG_buddy
PG_buddy can be converted to _mapcount == -2. So the PG_compound_lock can
be added to page->flags without overflowing (because of the sparse section
bits increasing) with CONFIG_X86_PAE=y and CONFIG_X86_PAT=y. This also
has to move the memory hotplug code from _mapcount to lru.next to avoid
any risk of clashes. We can't use lru.next for PG_buddy removal, but
memory hotplug can use lru.next even more easily than the mapcount
instead.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/include/asm/bitops.h')
0 files changed, 0 insertions, 0 deletions
