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alistair23-linux
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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>
zero-sugar-mainline-defconfig
Vitaly Wool 2020-12-14 19:12:36 -08:00 committed by Linus Torvalds
parent dcf5aedb24
commit 135f97fd0c
1 changed files with 10 additions and 7 deletions
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17
mm/z3fold.c
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@ -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;