From: Mike Rapoport <rppt@xxxxxxxxxxxxx> Hi, David noticed that we do some of memblock_reserve() calls after allocations are possible: https://lore.kernel.org/lkml/6ba6bde3-1520-5cd0-f987-32d543f0b79f@xxxxxxxxxx For now there is no actual problem because in top-down mode we allocate from the end of the memory and in bottom-up mode we allocate above the kernel image. But there is a patch in the mm tree that allow bottom-up allocations below the kernel: https://lore.kernel.org/lkml/20201217201214.3414100-2-guro@xxxxxx and with this change we may get a memory corruption if an allocation steps on some of the firmware areas that are yet to be reserved. The below patches consolidate early memory reservations done during setup_arch() so that memory used by firmware, bootloader, kernel text/data and the memory that should be excluded from the available memory for whatever other reason is reserved before memblock allocations are possible. The patches are vs v5.11-rc3-mmots-2021-01-12-02-00 as I think they are prerequisite for the memblock bottom-up changes, but if needed I can rebase then on another tree. Mike Rapoport (2): x86/setup: consolidate early memory reservations x86/setup: merge several reservations of start of the memory arch/x86/kernel/setup.c | 85 +++++++++++++++++++++-------------------- 1 file changed, 43 insertions(+), 42 deletions(-) -- 2.28.0
