From f5fbf1dccda26971b16bafd3f861ce1f5956d7d7 Mon Sep 17 00:00:00 2001 From: Vitaly Wool Date: Mon, 14 Dec 2020 19:12:36 -0800 Subject: [PATCH 001/323] z3fold: remove preempt disabled sections for RT Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.215-rt107.tar.xz Replace get_cpu_ptr() with migrate_disable()+this_cpu_ptr() so RT can take spinlocks that become sleeping locks. Signed-off-by Mike Galbraith Link: https://lkml.kernel.org/r/20201209145151.18994-3-vitaly.wool@konsulko.com Signed-off-by: Vitaly Wool Cc: Sebastian Andrzej Siewior Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sebastian Andrzej Siewior --- mm/z3fold.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) diff --git a/mm/z3fold.c b/mm/z3fold.c index 912ac9a64a155..f3d875fcaeb77 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 @@ static inline struct z3fold_header *__z3fold_alloc(struct z3fold_pool *pool, !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 @@ static inline struct z3fold_header *__z3fold_alloc(struct z3fold_pool *pool, 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 @@ static inline struct z3fold_header *__z3fold_alloc(struct z3fold_pool *pool, kref_get(&zhdr->refcount); break; } - put_cpu_ptr(pool->unbuddied); + migrate_enable(); if (!zhdr) { int cpu; -- 2.44.0