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Diffstat (limited to '')
| -rw-r--r-- | debian/patches-rt/0001-z3fold-remove-preempt-disabled-sections-for-RT.patch | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/debian/patches-rt/0001-z3fold-remove-preempt-disabled-sections-for-RT.patch b/debian/patches-rt/0001-z3fold-remove-preempt-disabled-sections-for-RT.patch new file mode 100644 index 000000000..c161007b7 --- /dev/null +++ b/debian/patches-rt/0001-z3fold-remove-preempt-disabled-sections-for-RT.patch @@ -0,0 +1,86 @@ +From 373cc1c1427a46b4bf77f0d782d8bd8b2d00bc54 Mon Sep 17 00:00:00 2001 +From: Vitaly Wool <vitaly.wool@konsulko.com> +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-5.10.204-rt100.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 <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> +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + mm/z3fold.c | 17 ++++++++++------- + 1 file changed, 10 insertions(+), 7 deletions(-) + +diff --git a/mm/z3fold.c b/mm/z3fold.c +index 912ac9a64a15..f3d875fcaeb7 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; +-- +2.43.0 + |