[PATCH v6 14/33] mm, slub: restore irqs around calling new_slab()
From: Vlastimil Babka <hidden>
Date: 2021-09-04 10:50:51
Also in:
lkml
Subsystem:
memory management, slab allocator, the rest · Maintainers:
Andrew Morton, Vlastimil Babka, Harry Yoo, Linus Torvalds
allocate_slab() currently re-enables irqs before calling to the page allocator. It depends on gfpflags_allow_blocking() to determine if it's safe to do so. Now we can instead simply restore irq before calling it through new_slab(). The other caller early_kmem_cache_node_alloc() is unaffected by this. Signed-off-by: Vlastimil Babka <redacted> --- mm/slub.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/mm/slub.c b/mm/slub.c
index 4d1f3e4a5951..7798ba1c614f 100644
--- a/mm/slub.c
+++ b/mm/slub.c@@ -1809,9 +1809,6 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) flags &= gfp_allowed_mask; - if (gfpflags_allow_blocking(flags)) - local_irq_enable(); - flags |= s->allocflags; /*
@@ -1870,8 +1867,6 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) page->frozen = 1; out: - if (gfpflags_allow_blocking(flags)) - local_irq_disable(); if (!page) return NULL;
@@ -2812,16 +2807,17 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, goto check_new_page; } + local_irq_restore(flags); put_cpu_ptr(s->cpu_slab); page = new_slab(s, gfpflags, node); c = get_cpu_ptr(s->cpu_slab); if (unlikely(!page)) { - local_irq_restore(flags); slab_out_of_memory(s, gfpflags, node); return NULL; } + local_irq_save(flags); if (c->page) flush_slab(s, c);
--
2.33.0