Tejun, Yinghai and others, Here is an attempt to convert the core kernel code to memblock allocator APIs when used with NO_BOOTMEM. Based on discussion thread [1] and my limited understanding of the topic, I tried to cook up this RFC with help from Grygorii. I am counting on reviews, guidance and testing help to move forward with the approach. This is one of the blocking item for the ARM LPAE architecture on the physical memory starts after 4BG boundary and hence needs the early memory allocators
As outlined by Tejun, we would like to remove the use of nobootmem.c and then eventually bootmem allocator once all arch switch to NO_BOOTMEM. Not to break the existing architectures using bootmem, all the new memblock interfaces fall back to bootmem layer with !NO_BOOTMEM Testing is done on ARM architecture with 32 bit and ARM LAPE machines with normal as well sparse(famed) memory model. To convert ARM to NO_BOOTMEM, I have used Russell's work [2] and couple of patches on top of that. Comments/suggestions are welcome !! Cc: Yinghai Lu <[email protected]> Cc: Tejun Heo <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Russell King <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Nicolas Pitre <[email protected]> Cc: Olof Johansson <[email protected]> Grygorii Strashko (9): mm/bootmem: remove duplicated declaration of __free_pages_bootmem() mm/block: remove unnecessary inclusion of bootmem.h mm/memory_hotplug: remove unnecessary inclusion of bootmem.h mm/staging: remove unnecessary inclusion of bootmem.h mm/char: remove unnecessary inclusion of bootmem.h mm/memblock: debug: correct displaying of upper memory boundary mm/memblock: debug: don't free reserved array if !ARCH_DISCARD_MEMBLOCK mm/hugetlb: Use memblock apis for early memory allocations mm/page_cgroup: Use memblock apis for early memory allocations Santosh Shilimkar (14): mm/memblock: Add memblock early memory allocation apis mm/init: Use memblock apis for early memory allocations mm/printk: Use memblock apis for early memory allocations mm/page_alloc: Use memblock apis for early memory allocations mm/power: Use memblock apis for early memory allocations mm/lib: Use memblock apis for early memory allocations mm/lib: Use memblock apis for early memory allocations mm/sparse: Use memblock apis for early memory allocations mm/percpu: Use memblock apis for early memory allocations mm/memory_hotplug: Use memblock apis for early memory allocations mm/firmware: Use memblock apis for early memory allocations mm/ARM: kernel: Use memblock apis for early memory allocations mm/ARM: mm: Use memblock apis for early memory allocations mm/ARM: OMAP: Use memblock apis for early memory allocations arch/arm/kernel/devtree.c | 2 +- arch/arm/kernel/setup.c | 2 +- arch/arm/mach-omap2/omap_hwmod.c | 8 +-- arch/arm/mm/init.c | 2 +- block/blk-ioc.c | 1 - drivers/char/mem.c | 1 - drivers/firmware/memmap.c | 2 +- drivers/staging/speakup/main.c | 2 - include/linux/bootmem.h | 73 ++++++++++++++++++++++- init/main.c | 4 +- kernel/power/snapshot.c | 2 +- kernel/printk/printk.c | 10 +--- lib/cpumask.c | 4 +- lib/swiotlb.c | 30 +++++----- mm/hugetlb.c | 10 ++-- mm/memblock.c | 122 +++++++++++++++++++++++++++++++++++++- mm/memory_hotplug.c | 3 +- mm/page_alloc.c | 26 ++++---- mm/page_cgroup.c | 5 +- mm/percpu.c | 39 +++++++----- mm/sparse-vmemmap.c | 5 +- mm/sparse.c | 24 ++++---- 22 files changed, 284 insertions(+), 93 deletions(-) Regards, Santosh [1] https://lkml.org/lkml/2013/6/29/77 [2] http://lwn.net/Articles/561854/ -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
