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> > unsigned long __read_mostly xen_phys_start; > > +unsigned long __ro_after_init brk_end; > + > /* Only used in asm code and within this source file */ > char asmlinkage __section(".init.bss.stack_aligned") __aligned(STACK_SIZE) > cpu0_stack[STACK_SIZE]; > @@ -1141,7 +1144,6 @@ void asmlinkage __init noreturn __start_ > struct boot_info *bi; > unsigned long nr_pages, raw_max_page; > int i, j, bytes = 0; > - unsigned long eb_start, eb_end; > bool acpi_boot_table_init_done = false, relocated = false; > bool vm_init_done = false; > int ret; > @@ -1511,7 +1513,7 @@ void asmlinkage __init noreturn __start_ > /* > * This needs to remain in sync with remove_xen_ranges() and the > * respective reserve_e820_ram() invocation below. No need to > - * query efi_boot_mem_unused() here, though. > + * query brk_get_unused_start() here, though. > */ > xen->start = virt_to_maddr(_stext); > xen->size = __2M_rwdata_end - _stext; > @@ -1654,18 +1656,11 @@ void asmlinkage __init noreturn __start_ > if ( !xen_phys_start ) > panic("Not enough memory to relocate Xen\n"); > > - /* FIXME: Putting a hole in .bss would shatter the large page mapping. */ > - if ( using_2M_mapping() ) > - efi_boot_mem_unused(NULL, NULL); > - > /* This needs to remain in sync with remove_xen_ranges(). */ > - if ( efi_boot_mem_unused(&eb_start, &eb_end) ) > - { > - reserve_e820_ram(&boot_e820, __pa(_stext), __pa(eb_start)); > - reserve_e820_ram(&boot_e820, __pa(eb_end), __pa(__2M_rwdata_end)); > - } > - else > - reserve_e820_ram(&boot_e820, __pa(_stext), __pa(__2M_rwdata_end)); > + brk_end = brk_get_unused_start(); > + if ( using_2M_mapping() ) > + brk_end = PAGE_ALIGN_2M(brk_end); > + reserve_e820_ram(&boot_e820, __pa(_stext), __pa(brk_end)); Hiding brk_end in setup.c like this is quite rude.  I guess it's because you want to have brk.c be brk.init.o, but it really does live with the other brk functions. Furthermore, having brk_end right from the outset fixes the fact that brk_get_unused_start() is doing things beyond retrieving a value. With brk_end being the real bump pointer the allocator uses, then the only function you need is brk_finish() (name subject to improvement) which is now very clear about the point at which brk allocations cease working. The rest, dropping EFI's current ebmalloc() all looks fine now. ~Andrew