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Subject[PATCH 25/34] mm: Use CONFIG_PREEMPTION
Date
From: Thomas Gleixner <tglx@linutronix.de>

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by CONFIG_PREEMPT_RT.
Both PREEMPT and PREEMPT_RT require the same functionality which today
depends on CONFIG_PREEMPT.

Switch the pte_unmap_same() and SLUB code over to use CONFIG_PREEMPTION.

Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
mm/memory.c | 2 +-
mm/slub.c | 12 ++++++------
2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index b1ca51a079f27..fd2cede4a84f0 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2133,7 +2133,7 @@ static inline int pte_unmap_same(struct mm_struct *mm, pmd_t *pmd,
pte_t *page_table, pte_t orig_pte)
{
int same = 1;
-#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPTION)
if (sizeof(pte_t) > sizeof(unsigned long)) {
spinlock_t *ptl = pte_lockptr(mm, pmd);
spin_lock(ptl);
diff --git a/mm/slub.c b/mm/slub.c
index 3d63ae320d31b..23fa669934829 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1984,7 +1984,7 @@ static void *get_partial(struct kmem_cache *s, gfp_t flags, int node,
return get_any_partial(s, flags, c);
}

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
/*
* Calculate the next globally unique transaction for disambiguiation
* during cmpxchg. The transactions start with the cpu number and are then
@@ -2029,7 +2029,7 @@ static inline void note_cmpxchg_failure(const char *n,

pr_info("%s %s: cmpxchg redo ", n, s->name);

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
if (tid_to_cpu(tid) != tid_to_cpu(actual_tid))
pr_warn("due to cpu change %d -> %d\n",
tid_to_cpu(tid), tid_to_cpu(actual_tid));
@@ -2657,7 +2657,7 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
unsigned long flags;

local_irq_save(flags);
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
/*
* We may have been preempted and rescheduled on a different
* cpu before disabling interrupts. Need to reload cpu area
@@ -2700,13 +2700,13 @@ static __always_inline void *slab_alloc_node(struct kmem_cache *s,
* as we end up on the original cpu again when doing the cmpxchg.
*
* We should guarantee that tid and kmem_cache are retrieved on
- * the same cpu. It could be different if CONFIG_PREEMPT so we need
+ * the same cpu. It could be different if CONFIG_PREEMPTION so we need
* to check if it is matched or not.
*/
do {
tid = this_cpu_read(s->cpu_slab->tid);
c = raw_cpu_ptr(s->cpu_slab);
- } while (IS_ENABLED(CONFIG_PREEMPT) &&
+ } while (IS_ENABLED(CONFIG_PREEMPTION) &&
unlikely(tid != READ_ONCE(c->tid)));

/*
@@ -2984,7 +2984,7 @@ static __always_inline void do_slab_free(struct kmem_cache *s,
do {
tid = this_cpu_read(s->cpu_slab->tid);
c = raw_cpu_ptr(s->cpu_slab);
- } while (IS_ENABLED(CONFIG_PREEMPT) &&
+ } while (IS_ENABLED(CONFIG_PREEMPTION) &&
unlikely(tid != READ_ONCE(c->tid)));

/* Same with comment on barrier() in slab_alloc_node() */
--
2.23.0
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