Hi, This series came out of seemingly naive exceursion into understanding/removing __ARCH_USE_5LEVEL_HACK from ARC port. With removal of 5LEVEL_HACK some extraneous code was bein generated | bloat-o-meter2 vmlinux-[AB]* | add/remove: 0/0 grow/shrink: 3/0 up/down: 130/0 (130) | function old new delta | free_pgd_range 548 660 +112 | p4d_clear_bad 2 20 +18 Which the patches here elides (for folded p4d/pud/pmd) | bloat-o-meter2 vmlinux-[BF]* | add/remove: 0/2 grow/shrink: 0/1 up/down: 0/-386 (-386) | function old new delta | pud_clear_bad 20 - -20 | p4d_clear_bad 20 - -20 | free_pgd_range 660 314 -346 The code savings are not a whole lot, but still worthwhile IMHO. Please review, test and apply. It seems to survive my usual battery of multibench, hakcbench etc. Thx, -Vineet --- Changes since v1 [1] - Per Linus Sugestion remvoed the extra ifdey'ery (hence not accumulating Kirill's ACks) - Added the RFC patch for pmd_free_tlb() after discussions [2] - Also throwing in the ARC patch which started this all (so we get the full context of patchset) - I'm ok if this goes via mm tree, should be non contentious and can drop this too if Andrew thinks otherwise [1] http://lists.infradead.org/pipermail/linux-snps-arc/2019-October/006263.html [2] http://lists.infradead.org/pipermail/linux-snps-arc/2019-October/006277.html --- Vineet Gupta (5): ARC: mm: remove __ARCH_USE_5LEVEL_HACK asm-generic/tlb: stub out pud_free_tlb() if nopud ... asm-generic/tlb: stub out p4d_free_tlb() if nop4d ... asm-generic/tlb: stub out pmd_free_tlb() if nopmd asm-generic/mm: stub out p{4,d}d_clear_bad() if __PAGETABLE_P{4,u}D_FOLDED arch/arc/include/asm/pgtable.h | 1 - arch/arc/mm/fault.c | 10 ++++++++-- arch/arc/mm/highmem.c | 4 +++- include/asm-generic/4level-fixup.h | 1 - include/asm-generic/5level-fixup.h | 1 - include/asm-generic/pgtable-nop4d.h | 2 +- include/asm-generic/pgtable-nopmd.h | 2 +- include/asm-generic/pgtable-nopud.h | 2 +- include/asm-generic/pgtable.h | 11 +++++++++++ include/asm-generic/tlb.h | 4 ---- mm/pgtable-generic.c | 8 ++++++++ 11 files changed, 33 insertions(+), 13 deletions(-) -- 2.20.1
