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git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
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Mathieu Desnoyers
6ac433f8b2
The cpu_bitmap flexible array now contains more than just the cpu_bitmap.
In preparation for changing the static mm_struct definitions to cover for
the additional space required, change the cpu_bitmap type from "unsigned
long" to "char", require an unsigned long alignment of the flexible array,
and rename the field from "cpu_bitmap" to "flexible_array".
Introduce the MM_STRUCT_FLEXIBLE_ARRAY_INIT macro to statically initialize
the flexible array. This covers the init_mm and efi_mm static
definitions.
This is a preparation step for fixing the missing mm_cid size for static
mm_struct definitions.
Link: https://lkml.kernel.org/r/[email protected]
Fixes: af7f588d8f ("sched: Introduce per-memory-map concurrency ID")
Signed-off-by: Mathieu Desnoyers <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Aboorva Devarajan <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Baolin Wang <[email protected]>
Cc: Christan König <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Dennis Zhou <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: "Liam R . Howlett" <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: Martin Liu <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Mateusz Guzik <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Miaohe Lin <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: SeongJae Park <[email protected]>
Cc: Shakeel Butt <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Sweet Tea Dorminy <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Wei Yang <[email protected]>
Cc: Yu Zhao <[email protected]>
Cc: Peter Zijlstra (Intel) <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/mm_types.h>
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#include <linux/maple_tree.h>
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#include <linux/rwsem.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/cpumask.h>
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#include <linux/mman.h>
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#include <linux/pgtable.h>
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#include <linux/atomic.h>
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#include <linux/user_namespace.h>
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#include <linux/iommu.h>
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#include <asm/mmu.h>
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#ifndef INIT_MM_CONTEXT
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#define INIT_MM_CONTEXT(name)
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#endif
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const struct vm_operations_struct vma_dummy_vm_ops;
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/*
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* For dynamically allocated mm_structs, there is a dynamically sized cpumask
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* at the end of the structure, the size of which depends on the maximum CPU
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* number the system can see. That way we allocate only as much memory for
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* mm_cpumask() as needed for the hundreds, or thousands of processes that
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* a system typically runs.
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*
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* Since there is only one init_mm in the entire system, keep it simple
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* and size this cpu_bitmask to NR_CPUS.
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*/
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struct mm_struct init_mm = {
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.mm_mt = MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, init_mm.mmap_lock),
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.pgd = swapper_pg_dir,
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.mm_users = ATOMIC_INIT(2),
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.mm_count = ATOMIC_INIT(1),
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.write_protect_seq = SEQCNT_ZERO(init_mm.write_protect_seq),
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MMAP_LOCK_INITIALIZER(init_mm)
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.page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
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.arg_lock = __SPIN_LOCK_UNLOCKED(init_mm.arg_lock),
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.mmlist = LIST_HEAD_INIT(init_mm.mmlist),
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#ifdef CONFIG_PER_VMA_LOCK
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.vma_writer_wait = __RCUWAIT_INITIALIZER(init_mm.vma_writer_wait),
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.mm_lock_seq = SEQCNT_ZERO(init_mm.mm_lock_seq),
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#endif
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.user_ns = &init_user_ns,
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#ifdef CONFIG_SCHED_MM_CID
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.mm_cid.lock = __RAW_SPIN_LOCK_UNLOCKED(init_mm.mm_cid.lock),
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#endif
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.flexible_array = MM_STRUCT_FLEXIBLE_ARRAY_INIT,
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INIT_MM_CONTEXT(init_mm)
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};
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void setup_initial_init_mm(void *start_code, void *end_code,
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void *end_data, void *brk)
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{
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init_mm.start_code = (unsigned long)start_code;
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init_mm.end_code = (unsigned long)end_code;
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init_mm.end_data = (unsigned long)end_data;
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init_mm.brk = (unsigned long)brk;
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}
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