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Date: Tue, 25 May 2021 12:43:01 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Yejune Deng <yejune.deng@...il.com>, cl@...ux.com,
penberg@...nel.org, rientjes@...gle.com, iamjoonsoo.kim@....com,
akpm@...ux-foundation.org, Thomas Gleixner <tglx@...utronix.de>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Yejune Deng <yejunedeng@...il.com>
Subject: Re: [PATCH 1/2] mm: slab/slub: use raw_spinlock_t to define list_lock
On 5/25/21 12:23 PM, Yejune Deng wrote:
> Use raw_spinlock_t instead of spinlock_t to define list_lock
> that won't be preempted on mainline and PREEMPT_RT kernels.
>
> Signed-off-by: Yejune Deng <yejunedeng@...il.com>
Yeah, RT tree already has such patch, but with more thorough changelog:
https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/tree/patches/0001-mm-sl-au-b-Change-list_lock-to-raw_spinlock_t.patch?h=linux-5.12.y-rt-patches
But I think the SLAB part is unnecessary, as there's also a patch
restricting RT to SLUB only.
And for SLUB I just posted a series towards making the conversion to
raw_spinlock_t unnecessary:
https://lore.kernel.org/linux-mm/20210524233946.20352-1-vbabka@suse.cz/
> ---
> mm/slab.c | 90 +++++++++++++++++++++++++++++++--------------------------------
> mm/slab.h | 2 +-
> mm/slub.c | 50 +++++++++++++++++------------------
> 3 files changed, 71 insertions(+), 71 deletions(-)
>
> diff --git a/mm/slab.c b/mm/slab.c
> index d0f7256..ae54677 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -234,7 +234,7 @@ static void kmem_cache_node_init(struct kmem_cache_node *parent)
> parent->shared = NULL;
> parent->alien = NULL;
> parent->colour_next = 0;
> - spin_lock_init(&parent->list_lock);
> + raw_spin_lock_init(&parent->list_lock);
> parent->free_objects = 0;
> parent->free_touched = 0;
> }
> @@ -559,9 +559,9 @@ static noinline void cache_free_pfmemalloc(struct kmem_cache *cachep,
> page_node = page_to_nid(page);
> n = get_node(cachep, page_node);
>
> - spin_lock(&n->list_lock);
> + raw_spin_lock(&n->list_lock);
> free_block(cachep, &objp, 1, page_node, &list);
> - spin_unlock(&n->list_lock);
> + raw_spin_unlock(&n->list_lock);
>
> slabs_destroy(cachep, &list);
> }
> @@ -699,7 +699,7 @@ static void __drain_alien_cache(struct kmem_cache *cachep,
> struct kmem_cache_node *n = get_node(cachep, node);
>
> if (ac->avail) {
> - spin_lock(&n->list_lock);
> + raw_spin_lock(&n->list_lock);
> /*
> * Stuff objects into the remote nodes shared array first.
> * That way we could avoid the overhead of putting the objects
> @@ -710,7 +710,7 @@ static void __drain_alien_cache(struct kmem_cache *cachep,
>
> free_block(cachep, ac->entry, ac->avail, node, list);
> ac->avail = 0;
> - spin_unlock(&n->list_lock);
> + raw_spin_unlock(&n->list_lock);
> }
> }
>
> @@ -783,9 +783,9 @@ static int __cache_free_alien(struct kmem_cache *cachep, void *objp,
> slabs_destroy(cachep, &list);
> } else {
> n = get_node(cachep, page_node);
> - spin_lock(&n->list_lock);
> + raw_spin_lock(&n->list_lock);
> free_block(cachep, &objp, 1, page_node, &list);
> - spin_unlock(&n->list_lock);
> + raw_spin_unlock(&n->list_lock);
> slabs_destroy(cachep, &list);
> }
> return 1;
> @@ -826,10 +826,10 @@ static int init_cache_node(struct kmem_cache *cachep, int node, gfp_t gfp)
> */
> n = get_node(cachep, node);
> if (n) {
> - spin_lock_irq(&n->list_lock);
> + raw_spin_lock_irq(&n->list_lock);
> n->free_limit = (1 + nr_cpus_node(node)) * cachep->batchcount +
> cachep->num;
> - spin_unlock_irq(&n->list_lock);
> + raw_spin_unlock_irq(&n->list_lock);
>
> return 0;
> }
> @@ -908,7 +908,7 @@ static int setup_kmem_cache_node(struct kmem_cache *cachep,
> goto fail;
>
> n = get_node(cachep, node);
> - spin_lock_irq(&n->list_lock);
> + raw_spin_lock_irq(&n->list_lock);
> if (n->shared && force_change) {
> free_block(cachep, n->shared->entry,
> n->shared->avail, node, &list);
> @@ -926,7 +926,7 @@ static int setup_kmem_cache_node(struct kmem_cache *cachep,
> new_alien = NULL;
> }
>
> - spin_unlock_irq(&n->list_lock);
> + raw_spin_unlock_irq(&n->list_lock);
> slabs_destroy(cachep, &list);
>
> /*
> @@ -965,7 +965,7 @@ static void cpuup_canceled(long cpu)
> if (!n)
> continue;
>
> - spin_lock_irq(&n->list_lock);
> + raw_spin_lock_irq(&n->list_lock);
>
> /* Free limit for this kmem_cache_node */
> n->free_limit -= cachep->batchcount;
> @@ -976,7 +976,7 @@ static void cpuup_canceled(long cpu)
> nc->avail = 0;
>
> if (!cpumask_empty(mask)) {
> - spin_unlock_irq(&n->list_lock);
> + raw_spin_unlock_irq(&n->list_lock);
> goto free_slab;
> }
>
> @@ -990,7 +990,7 @@ static void cpuup_canceled(long cpu)
> alien = n->alien;
> n->alien = NULL;
>
> - spin_unlock_irq(&n->list_lock);
> + raw_spin_unlock_irq(&n->list_lock);
>
> kfree(shared);
> if (alien) {
> @@ -1174,7 +1174,7 @@ static void __init init_list(struct kmem_cache *cachep, struct kmem_cache_node *
> /*
> * Do not assume that spinlocks can be initialized via memcpy:
> */
> - spin_lock_init(&ptr->list_lock);
> + raw_spin_lock_init(&ptr->list_lock);
>
> MAKE_ALL_LISTS(cachep, ptr, nodeid);
> cachep->node[nodeid] = ptr;
> @@ -1345,11 +1345,11 @@ slab_out_of_memory(struct kmem_cache *cachep, gfp_t gfpflags, int nodeid)
> for_each_kmem_cache_node(cachep, node, n) {
> unsigned long total_slabs, free_slabs, free_objs;
>
> - spin_lock_irqsave(&n->list_lock, flags);
> + raw_spin_lock_irqsave(&n->list_lock, flags);
> total_slabs = n->total_slabs;
> free_slabs = n->free_slabs;
> free_objs = n->free_objects;
> - spin_unlock_irqrestore(&n->list_lock, flags);
> + raw_spin_unlock_irqrestore(&n->list_lock, flags);
>
> pr_warn(" node %d: slabs: %ld/%ld, objs: %ld/%ld\n",
> node, total_slabs - free_slabs, total_slabs,
> @@ -2107,7 +2107,7 @@ static void check_spinlock_acquired(struct kmem_cache *cachep)
> {
> #ifdef CONFIG_SMP
> check_irq_off();
> - assert_spin_locked(&get_node(cachep, numa_mem_id())->list_lock);
> + assert_raw_spin_locked(&get_node(cachep, numa_mem_id())->list_lock);
> #endif
> }
>
> @@ -2115,7 +2115,7 @@ static void check_spinlock_acquired_node(struct kmem_cache *cachep, int node)
> {
> #ifdef CONFIG_SMP
> check_irq_off();
> - assert_spin_locked(&get_node(cachep, node)->list_lock);
> + assert_raw_spin_locked(&get_node(cachep, node)->list_lock);
> #endif
> }
>
> @@ -2155,9 +2155,9 @@ static void do_drain(void *arg)
> check_irq_off();
> ac = cpu_cache_get(cachep);
> n = get_node(cachep, node);
> - spin_lock(&n->list_lock);
> + raw_spin_lock(&n->list_lock);
> free_block(cachep, ac->entry, ac->avail, node, &list);
> - spin_unlock(&n->list_lock);
> + raw_spin_unlock(&n->list_lock);
> ac->avail = 0;
> slabs_destroy(cachep, &list);
> }
> @@ -2175,9 +2175,9 @@ static void drain_cpu_caches(struct kmem_cache *cachep)
> drain_alien_cache(cachep, n->alien);
>
> for_each_kmem_cache_node(cachep, node, n) {
> - spin_lock_irq(&n->list_lock);
> + raw_spin_lock_irq(&n->list_lock);
> drain_array_locked(cachep, n->shared, node, true, &list);
> - spin_unlock_irq(&n->list_lock);
> + raw_spin_unlock_irq(&n->list_lock);
>
> slabs_destroy(cachep, &list);
> }
> @@ -2199,10 +2199,10 @@ static int drain_freelist(struct kmem_cache *cache,
> nr_freed = 0;
> while (nr_freed < tofree && !list_empty(&n->slabs_free)) {
>
> - spin_lock_irq(&n->list_lock);
> + raw_spin_lock_irq(&n->list_lock);
> p = n->slabs_free.prev;
> if (p == &n->slabs_free) {
> - spin_unlock_irq(&n->list_lock);
> + raw_spin_unlock_irq(&n->list_lock);
> goto out;
> }
>
> @@ -2215,7 +2215,7 @@ static int drain_freelist(struct kmem_cache *cache,
> * to the cache.
> */
> n->free_objects -= cache->num;
> - spin_unlock_irq(&n->list_lock);
> + raw_spin_unlock_irq(&n->list_lock);
> slab_destroy(cache, page);
> nr_freed++;
> }
> @@ -2651,7 +2651,7 @@ static void cache_grow_end(struct kmem_cache *cachep, struct page *page)
> INIT_LIST_HEAD(&page->slab_list);
> n = get_node(cachep, page_to_nid(page));
>
> - spin_lock(&n->list_lock);
> + raw_spin_lock(&n->list_lock);
> n->total_slabs++;
> if (!page->active) {
> list_add_tail(&page->slab_list, &n->slabs_free);
> @@ -2661,7 +2661,7 @@ static void cache_grow_end(struct kmem_cache *cachep, struct page *page)
>
> STATS_INC_GROWN(cachep);
> n->free_objects += cachep->num - page->active;
> - spin_unlock(&n->list_lock);
> + raw_spin_unlock(&n->list_lock);
>
> fixup_objfreelist_debug(cachep, &list);
> }
> @@ -2827,7 +2827,7 @@ static struct page *get_first_slab(struct kmem_cache_node *n, bool pfmemalloc)
> {
> struct page *page;
>
> - assert_spin_locked(&n->list_lock);
> + assert_raw_spin_locked(&n->list_lock);
> page = list_first_entry_or_null(&n->slabs_partial, struct page,
> slab_list);
> if (!page) {
> @@ -2854,10 +2854,10 @@ static noinline void *cache_alloc_pfmemalloc(struct kmem_cache *cachep,
> if (!gfp_pfmemalloc_allowed(flags))
> return NULL;
>
> - spin_lock(&n->list_lock);
> + raw_spin_lock(&n->list_lock);
> page = get_first_slab(n, true);
> if (!page) {
> - spin_unlock(&n->list_lock);
> + raw_spin_unlock(&n->list_lock);
> return NULL;
> }
>
> @@ -2866,7 +2866,7 @@ static noinline void *cache_alloc_pfmemalloc(struct kmem_cache *cachep,
>
> fixup_slab_list(cachep, n, page, &list);
>
> - spin_unlock(&n->list_lock);
> + raw_spin_unlock(&n->list_lock);
> fixup_objfreelist_debug(cachep, &list);
>
> return obj;
> @@ -2925,7 +2925,7 @@ static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags)
> if (!n->free_objects && (!shared || !shared->avail))
> goto direct_grow;
>
> - spin_lock(&n->list_lock);
> + raw_spin_lock(&n->list_lock);
> shared = READ_ONCE(n->shared);
>
> /* See if we can refill from the shared array */
> @@ -2949,7 +2949,7 @@ static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags)
> must_grow:
> n->free_objects -= ac->avail;
> alloc_done:
> - spin_unlock(&n->list_lock);
> + raw_spin_unlock(&n->list_lock);
> fixup_objfreelist_debug(cachep, &list);
>
> direct_grow:
> @@ -3174,7 +3174,7 @@ static void *____cache_alloc_node(struct kmem_cache *cachep, gfp_t flags,
> BUG_ON(!n);
>
> check_irq_off();
> - spin_lock(&n->list_lock);
> + raw_spin_lock(&n->list_lock);
> page = get_first_slab(n, false);
> if (!page)
> goto must_grow;
> @@ -3192,12 +3192,12 @@ static void *____cache_alloc_node(struct kmem_cache *cachep, gfp_t flags,
>
> fixup_slab_list(cachep, n, page, &list);
>
> - spin_unlock(&n->list_lock);
> + raw_spin_unlock(&n->list_lock);
> fixup_objfreelist_debug(cachep, &list);
> return obj;
>
> must_grow:
> - spin_unlock(&n->list_lock);
> + raw_spin_unlock(&n->list_lock);
> page = cache_grow_begin(cachep, gfp_exact_node(flags), nodeid);
> if (page) {
> /* This slab isn't counted yet so don't update free_objects */
> @@ -3383,7 +3383,7 @@ static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac)
>
> check_irq_off();
> n = get_node(cachep, node);
> - spin_lock(&n->list_lock);
> + raw_spin_lock(&n->list_lock);
> if (n->shared) {
> struct array_cache *shared_array = n->shared;
> int max = shared_array->limit - shared_array->avail;
> @@ -3412,7 +3412,7 @@ static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac)
> STATS_SET_FREEABLE(cachep, i);
> }
> #endif
> - spin_unlock(&n->list_lock);
> + raw_spin_unlock(&n->list_lock);
> ac->avail -= batchcount;
> memmove(ac->entry, &(ac->entry[batchcount]), sizeof(void *)*ac->avail);
> slabs_destroy(cachep, &list);
> @@ -3877,9 +3877,9 @@ static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
>
> node = cpu_to_mem(cpu);
> n = get_node(cachep, node);
> - spin_lock_irq(&n->list_lock);
> + raw_spin_lock_irq(&n->list_lock);
> free_block(cachep, ac->entry, ac->avail, node, &list);
> - spin_unlock_irq(&n->list_lock);
> + raw_spin_unlock_irq(&n->list_lock);
> slabs_destroy(cachep, &list);
> }
> free_percpu(prev);
> @@ -3974,9 +3974,9 @@ static void drain_array(struct kmem_cache *cachep, struct kmem_cache_node *n,
> return;
> }
>
> - spin_lock_irq(&n->list_lock);
> + raw_spin_lock_irq(&n->list_lock);
> drain_array_locked(cachep, ac, node, false, &list);
> - spin_unlock_irq(&n->list_lock);
> + raw_spin_unlock_irq(&n->list_lock);
>
> slabs_destroy(cachep, &list);
> }
> @@ -4060,7 +4060,7 @@ void get_slabinfo(struct kmem_cache *cachep, struct slabinfo *sinfo)
>
> for_each_kmem_cache_node(cachep, node, n) {
> check_irq_on();
> - spin_lock_irq(&n->list_lock);
> + raw_spin_lock_irq(&n->list_lock);
>
> total_slabs += n->total_slabs;
> free_slabs += n->free_slabs;
> @@ -4069,7 +4069,7 @@ void get_slabinfo(struct kmem_cache *cachep, struct slabinfo *sinfo)
> if (n->shared)
> shared_avail += n->shared->avail;
>
> - spin_unlock_irq(&n->list_lock);
> + raw_spin_unlock_irq(&n->list_lock);
> }
> num_objs = total_slabs * cachep->num;
> active_slabs = total_slabs - free_slabs;
> diff --git a/mm/slab.h b/mm/slab.h
> index b4cdf86..ecb6e89 100644
> --- a/mm/slab.h
> +++ b/mm/slab.h
> @@ -524,7 +524,7 @@ static inline void slab_post_alloc_hook(struct kmem_cache *s,
> * The slab lists for all objects.
> */
> struct kmem_cache_node {
> - spinlock_t list_lock;
> + raw_spinlock_t list_lock;
>
> #ifdef CONFIG_SLAB
> struct list_head slabs_partial; /* partial list first, better asm code */
> diff --git a/mm/slub.c b/mm/slub.c
> index ee51857..c2f63c3 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -1269,7 +1269,7 @@ static noinline int free_debug_processing(
> unsigned long flags;
> int ret = 0;
>
> - spin_lock_irqsave(&n->list_lock, flags);
> + raw_spin_lock_irqsave(&n->list_lock, flags);
> slab_lock(page);
>
> if (s->flags & SLAB_CONSISTENCY_CHECKS) {
> @@ -1304,7 +1304,7 @@ static noinline int free_debug_processing(
> bulk_cnt, cnt);
>
> slab_unlock(page);
> - spin_unlock_irqrestore(&n->list_lock, flags);
> + raw_spin_unlock_irqrestore(&n->list_lock, flags);
> if (!ret)
> slab_fix(s, "Object at 0x%px not freed", object);
> return ret;
> @@ -2033,7 +2033,7 @@ static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n,
> if (!n || !n->nr_partial)
> return NULL;
>
> - spin_lock(&n->list_lock);
> + raw_spin_lock(&n->list_lock);
> list_for_each_entry_safe(page, page2, &n->partial, slab_list) {
> void *t;
>
> @@ -2058,7 +2058,7 @@ static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n,
> break;
>
> }
> - spin_unlock(&n->list_lock);
> + raw_spin_unlock(&n->list_lock);
> return object;
> }
>
> @@ -2301,7 +2301,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page,
> * that acquire_slab() will see a slab page that
> * is frozen
> */
> - spin_lock(&n->list_lock);
> + raw_spin_lock(&n->list_lock);
> }
> } else {
> m = M_FULL;
> @@ -2312,7 +2312,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page,
> * slabs from diagnostic functions will not see
> * any frozen slabs.
> */
> - spin_lock(&n->list_lock);
> + raw_spin_lock(&n->list_lock);
> }
> }
>
> @@ -2336,7 +2336,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page,
> goto redo;
>
> if (lock)
> - spin_unlock(&n->list_lock);
> + raw_spin_unlock(&n->list_lock);
>
> if (m == M_PARTIAL)
> stat(s, tail);
> @@ -2375,10 +2375,10 @@ static void unfreeze_partials(struct kmem_cache *s,
> n2 = get_node(s, page_to_nid(page));
> if (n != n2) {
> if (n)
> - spin_unlock(&n->list_lock);
> + raw_spin_unlock(&n->list_lock);
>
> n = n2;
> - spin_lock(&n->list_lock);
> + raw_spin_lock(&n->list_lock);
> }
>
> do {
> @@ -2407,7 +2407,7 @@ static void unfreeze_partials(struct kmem_cache *s,
> }
>
> if (n)
> - spin_unlock(&n->list_lock);
> + raw_spin_unlock(&n->list_lock);
>
> while (discard_page) {
> page = discard_page;
> @@ -2574,10 +2574,10 @@ static unsigned long count_partial(struct kmem_cache_node *n,
> unsigned long x = 0;
> struct page *page;
>
> - spin_lock_irqsave(&n->list_lock, flags);
> + raw_spin_lock_irqsave(&n->list_lock, flags);
> list_for_each_entry(page, &n->partial, slab_list)
> x += get_count(page);
> - spin_unlock_irqrestore(&n->list_lock, flags);
> + raw_spin_unlock_irqrestore(&n->list_lock, flags);
> return x;
> }
> #endif /* CONFIG_SLUB_DEBUG || CONFIG_SYSFS */
> @@ -3045,7 +3045,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
>
> do {
> if (unlikely(n)) {
> - spin_unlock_irqrestore(&n->list_lock, flags);
> + raw_spin_unlock_irqrestore(&n->list_lock, flags);
> n = NULL;
> }
> prior = page->freelist;
> @@ -3077,7 +3077,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
> * Otherwise the list_lock will synchronize with
> * other processors updating the list of slabs.
> */
> - spin_lock_irqsave(&n->list_lock, flags);
> + raw_spin_lock_irqsave(&n->list_lock, flags);
>
> }
> }
> @@ -3119,7 +3119,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
> add_partial(n, page, DEACTIVATE_TO_TAIL);
> stat(s, FREE_ADD_PARTIAL);
> }
> - spin_unlock_irqrestore(&n->list_lock, flags);
> + raw_spin_unlock_irqrestore(&n->list_lock, flags);
> return;
>
> slab_empty:
> @@ -3134,7 +3134,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
> remove_full(s, n, page);
> }
>
> - spin_unlock_irqrestore(&n->list_lock, flags);
> + raw_spin_unlock_irqrestore(&n->list_lock, flags);
> stat(s, FREE_SLAB);
> discard_slab(s, page);
> }
> @@ -3562,7 +3562,7 @@ static void
> init_kmem_cache_node(struct kmem_cache_node *n)
> {
> n->nr_partial = 0;
> - spin_lock_init(&n->list_lock);
> + raw_spin_lock_init(&n->list_lock);
> INIT_LIST_HEAD(&n->partial);
> #ifdef CONFIG_SLUB_DEBUG
> atomic_long_set(&n->nr_slabs, 0);
> @@ -3962,7 +3962,7 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
> struct page *page, *h;
>
> BUG_ON(irqs_disabled());
> - spin_lock_irq(&n->list_lock);
> + raw_spin_lock_irq(&n->list_lock);
> list_for_each_entry_safe(page, h, &n->partial, slab_list) {
> if (!page->inuse) {
> remove_partial(n, page);
> @@ -3972,7 +3972,7 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
> "Objects remaining in %s on __kmem_cache_shutdown()");
> }
> }
> - spin_unlock_irq(&n->list_lock);
> + raw_spin_unlock_irq(&n->list_lock);
>
> list_for_each_entry_safe(page, h, &discard, slab_list)
> discard_slab(s, page);
> @@ -4305,7 +4305,7 @@ int __kmem_cache_shrink(struct kmem_cache *s)
> for (i = 0; i < SHRINK_PROMOTE_MAX; i++)
> INIT_LIST_HEAD(promote + i);
>
> - spin_lock_irqsave(&n->list_lock, flags);
> + raw_spin_lock_irqsave(&n->list_lock, flags);
>
> /*
> * Build lists of slabs to discard or promote.
> @@ -4336,7 +4336,7 @@ int __kmem_cache_shrink(struct kmem_cache *s)
> for (i = SHRINK_PROMOTE_MAX - 1; i >= 0; i--)
> list_splice(promote + i, &n->partial);
>
> - spin_unlock_irqrestore(&n->list_lock, flags);
> + raw_spin_unlock_irqrestore(&n->list_lock, flags);
>
> /* Release empty slabs */
> list_for_each_entry_safe(page, t, &discard, slab_list)
> @@ -4706,7 +4706,7 @@ static int validate_slab_node(struct kmem_cache *s,
> struct page *page;
> unsigned long flags;
>
> - spin_lock_irqsave(&n->list_lock, flags);
> + raw_spin_lock_irqsave(&n->list_lock, flags);
>
> list_for_each_entry(page, &n->partial, slab_list) {
> validate_slab(s, page);
> @@ -4732,7 +4732,7 @@ static int validate_slab_node(struct kmem_cache *s,
> }
>
> out:
> - spin_unlock_irqrestore(&n->list_lock, flags);
> + raw_spin_unlock_irqrestore(&n->list_lock, flags);
> return count;
> }
>
> @@ -4913,12 +4913,12 @@ static int list_locations(struct kmem_cache *s, char *buf,
> if (!atomic_long_read(&n->nr_slabs))
> continue;
>
> - spin_lock_irqsave(&n->list_lock, flags);
> + raw_spin_lock_irqsave(&n->list_lock, flags);
> list_for_each_entry(page, &n->partial, slab_list)
> process_slab(&t, s, page, alloc);
> list_for_each_entry(page, &n->full, slab_list)
> process_slab(&t, s, page, alloc);
> - spin_unlock_irqrestore(&n->list_lock, flags);
> + raw_spin_unlock_irqrestore(&n->list_lock, flags);
> }
>
> for (i = 0; i < t.count; i++) {
>
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