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um: fix MAX_ORDER usage in linux_main()

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MAX_ORDER is not inclusive: the maximum allocation order buddy allocator
can deliver is MAX_ORDER-1.

Fix MAX_ORDER usage in linux_main().

Link: https://lkml.kernel.org/r/20230315113133.11326-3-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov
2023-03-15 14:31:25 +03:00
committed by Andrew Morton
parent 75558ad315
commit 254ca6d261
1 changed files with 2 additions and 2 deletions
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4
arch/um/kernel/um_arch.c
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@@ -368,10 +368,10 @@ int __init linux_main(int argc, char **argv)
max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
/*
* Zones have to begin on a 1 << MAX_ORDER page boundary,
* Zones have to begin on a 1 << MAX_ORDER-1 page boundary,
* so this makes sure that's true for highmem
*/
max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER - 1)) - 1);
if (physmem_size + iomem_size > max_physmem) {
highmem = physmem_size + iomem_size - max_physmem;
physmem_size -= highmem;