mmap locking API: add MMAP_LOCK_INITIALIZER
Define a new initializer for the mmap locking api. Initially this just evaluates to __RWSEM_INITIALIZER as the API is defined as wrappers around rwsem. Signed-off-by: Michel Lespinasse <walken@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: David Rientjes <rientjes@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Jerome Glisse <jglisse@redhat.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Liam Howlett <Liam.Howlett@oracle.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ying Han <yinghan@google.com> Link: http://lkml.kernel.org/r/20200520052908.204642-9-walken@google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -93,7 +93,7 @@ static struct mm_struct tboot_mm = {
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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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.mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem),
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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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.mmlist = LIST_HEAD_INIT(init_mm.mmlist),
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};
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@ -54,7 +54,7 @@ struct mm_struct efi_mm = {
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.mm_rb = RB_ROOT,
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.mm_users = ATOMIC_INIT(2),
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.mm_count = ATOMIC_INIT(1),
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.mmap_sem = __RWSEM_INITIALIZER(efi_mm.mmap_sem),
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MMAP_LOCK_INITIALIZER(efi_mm)
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.page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock),
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.mmlist = LIST_HEAD_INIT(efi_mm.mmlist),
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.cpu_bitmap = { [BITS_TO_LONGS(NR_CPUS)] = 0},
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@ -1,6 +1,9 @@
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#ifndef _LINUX_MMAP_LOCK_H
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#define _LINUX_MMAP_LOCK_H
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#define MMAP_LOCK_INITIALIZER(name) \
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.mmap_sem = __RWSEM_INITIALIZER((name).mmap_sem),
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static inline void mmap_init_lock(struct mm_struct *mm)
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{
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init_rwsem(&mm->mmap_sem);
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@ -31,7 +31,7 @@ struct mm_struct init_mm = {
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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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.mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem),
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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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