My previous patchseries was rushed and not polished enough. Furthermore it introduced some regressions. This patchseries fixes hopefully all the issues reported, and introduces some new features. It also simplifies the code and hopefully makes it more readable. Fixed: * allocated memory is now zeroed by default New features: * per-allocation flags to specify not just the area (like before) but also other parameters - dontzero flag: the allocation will not be zeroed - fresh flag: the returned memory has never been read or written to before I would appreciate if people could test these patches, especially on strange, unusual or exotic hardware (I tested only on s390x) GitLab: https://gitlab.com/imbrenda/kvm-unit-tests/-/tree/page_allocator_fixes CI: https://gitlab.com/imbrenda/kvm-unit-tests/-/pipelines/241819726 v1->v2 * have DONTZERO flag instead of a ZERO flag, this way there is no need for a default. * drop the last patch, since there is no need for a default now. * fixed a pre-existing bug that caused wrong allocations * renamed alloc_pages_special to reserve_pages, to make it clear it is not a normal allocation. The function now returns 0 on success and -1 on failure. * added a NULL check in vm_free; freeing a NULL pointer is now a no-op. * fix and improve some comments * remove a spurious return Claudio Imbrenda (11): lib/x86: fix page.h to include the generic header lib/list.h: add list_add_tail lib/vmalloc: add some asserts and improvements lib/asm: Fix definitions of memory areas lib/alloc_page: fix and improve the page allocator lib/alloc.h: remove align_min from struct alloc_ops lib/alloc_page: Optimization to skip known empty freelists lib/alloc_page: rework metadata format lib/alloc: replace areas with more generic flags lib/alloc_page: Wire up FLAG_DONTZERO lib/alloc_page: Properly handle requests for fresh blocks lib/asm-generic/memory_areas.h | 9 +- lib/arm/asm/memory_areas.h | 11 +- lib/arm64/asm/memory_areas.h | 11 +- lib/powerpc/asm/memory_areas.h | 11 +- lib/ppc64/asm/memory_areas.h | 11 +- lib/s390x/asm/memory_areas.h | 13 +- lib/x86/asm/memory_areas.h | 27 ++-- lib/x86/asm/page.h | 4 +- lib/alloc.h | 1 - lib/alloc_page.h | 76 ++++++--- lib/list.h | 9 ++ lib/alloc_page.c | 283 +++++++++++++++++++-------------- lib/alloc_phys.c | 9 +- lib/s390x/smp.c | 2 +- lib/vmalloc.c | 23 +-- 15 files changed, 284 insertions(+), 216 deletions(-) -- 2.26.2
