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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2016-01-20 14:58:12 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-20 17:09:18 -0800
commitf4be6153cca6c88eaf1e52931d9a010ad4ad940e (patch)
tree3dea0998c95f9e339dba4f2191ea360738b188b4 /virt/Makefile
parent0b9b6fff7b4caf5838550151d15b389aaa217707 (diff)
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fs/proc/task_mmu.c: add workaround for old compilers
For THP=n, HPAGE_PMD_NR in smaps_account() expands to BUILD_BUG(). That's fine since this codepath is eliminated by modern compilers. But older compilers have not that efficient dead code elimination. It causes problem at least with gcc 4.1.2 on m68k: fs/built-in.o: In function `smaps_account': task_mmu.c:(.text+0x4f8fa): undefined reference to `__compiletime_assert_471' Let's replace HPAGE_PMD_NR with 1 << compound_order(page). Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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