diff options
| author | Vitaly Wool <vitaly.wool@konsulko.com> | 2020-12-15 06:12:36 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-12-15 23:13:45 +0300 |
| commit | 135f97fd0c398f20a544cc52c3f8a3cb925a8aef (patch) | |
| tree | c3a52448d6fc5f5c22f44db7fea142435f18cef3 /mm | |
| parent | dcf5aedb24f899d537e21c18ea552c780598d352 (diff) | |
| download | linux-135f97fd0c398f20a544cc52c3f8a3cb925a8aef.tar.xz | |
z3fold: remove preempt disabled sections for RT
Replace get_cpu_ptr() with migrate_disable()+this_cpu_ptr() so RT can take
spinlocks that become sleeping locks.
Signed-off-by Mike Galbraith <efault@gmx.de>
Link: https://lkml.kernel.org/r/20201209145151.18994-3-vitaly.wool@konsulko.com
Signed-off-by: Vitaly Wool <vitaly.wool@konsulko.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/z3fold.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/mm/z3fold.c b/mm/z3fold.c index 0152ad9931a8..dacb0d70fa61 100644 --- a/mm/z3fold.c +++ b/mm/z3fold.c @@ -623,14 +623,16 @@ static inline void add_to_unbuddied(struct z3fold_pool *pool, { if (zhdr->first_chunks == 0 || zhdr->last_chunks == 0 || zhdr->middle_chunks == 0) { - struct list_head *unbuddied = get_cpu_ptr(pool->unbuddied); - + struct list_head *unbuddied; int freechunks = num_free_chunks(zhdr); + + migrate_disable(); + unbuddied = this_cpu_ptr(pool->unbuddied); spin_lock(&pool->lock); list_add(&zhdr->buddy, &unbuddied[freechunks]); spin_unlock(&pool->lock); zhdr->cpu = smp_processor_id(); - put_cpu_ptr(pool->unbuddied); + migrate_enable(); } } @@ -880,8 +882,9 @@ static inline struct z3fold_header *__z3fold_alloc(struct z3fold_pool *pool, int chunks = size_to_chunks(size), i; lookup: + migrate_disable(); /* First, try to find an unbuddied z3fold page. */ - unbuddied = get_cpu_ptr(pool->unbuddied); + unbuddied = this_cpu_ptr(pool->unbuddied); for_each_unbuddied_list(i, chunks) { struct list_head *l = &unbuddied[i]; @@ -899,7 +902,7 @@ lookup: !z3fold_page_trylock(zhdr)) { spin_unlock(&pool->lock); zhdr = NULL; - put_cpu_ptr(pool->unbuddied); + migrate_enable(); if (can_sleep) cond_resched(); goto lookup; @@ -913,7 +916,7 @@ lookup: test_bit(PAGE_CLAIMED, &page->private)) { z3fold_page_unlock(zhdr); zhdr = NULL; - put_cpu_ptr(pool->unbuddied); + migrate_enable(); if (can_sleep) cond_resched(); goto lookup; @@ -928,7 +931,7 @@ lookup: kref_get(&zhdr->refcount); break; } - put_cpu_ptr(pool->unbuddied); + migrate_enable(); if (!zhdr) { int cpu; |