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authorIngo Molnar <mingo@kernel.org>2021-02-12 14:50:09 +0300
committerIngo Molnar <mingo@kernel.org>2021-02-12 14:56:55 +0300
commit85e853c5ec8486117182baab10c98b321daa6d47 (patch)
tree404551f51bc88ba9f4cc64431e2633493a971842 /mm/slub.c
parentdcc0b49040c70ad827a7f3d58a21b01fdb14e749 (diff)
parent0d2460ba61841e5c2e64e77f7a84d3fc69cfe899 (diff)
downloadlinux-85e853c5ec8486117182baab10c98b321daa6d47.tar.xz
Merge branch 'for-mingo-rcu' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu
Pull RCU updates from Paul E. McKenney: - Documentation updates. - Miscellaneous fixes. - kfree_rcu() updates: Addition of mem_dump_obj() to provide allocator return addresses to more easily locate bugs. This has a couple of RCU-related commits, but is mostly MM. Was pulled in with akpm's agreement. - Per-callback-batch tracking of numbers of callbacks, which enables better debugging information and smarter reactions to large numbers of callbacks. - The first round of changes to allow CPUs to be runtime switched from and to callback-offloaded state. - CONFIG_PREEMPT_RT-related changes. - RCU CPU stall warning updates. - Addition of polling grace-period APIs for SRCU. - Torture-test and torture-test scripting updates, including a "torture everything" script that runs rcutorture, locktorture, scftorture, rcuscale, and refscale. Plus does an allmodconfig build. Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/mm/slub.c b/mm/slub.c
index b22a4b101c84..f5baf429654f 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3933,6 +3933,46 @@ int __kmem_cache_shutdown(struct kmem_cache *s)
return 0;
}
+void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct page *page)
+{
+ void *base;
+ int __maybe_unused i;
+ unsigned int objnr;
+ void *objp;
+ void *objp0;
+ struct kmem_cache *s = page->slab_cache;
+ struct track __maybe_unused *trackp;
+
+ kpp->kp_ptr = object;
+ kpp->kp_page = page;
+ kpp->kp_slab_cache = s;
+ base = page_address(page);
+ objp0 = kasan_reset_tag(object);
+#ifdef CONFIG_SLUB_DEBUG
+ objp = restore_red_left(s, objp0);
+#else
+ objp = objp0;
+#endif
+ objnr = obj_to_index(s, page, objp);
+ kpp->kp_data_offset = (unsigned long)((char *)objp0 - (char *)objp);
+ objp = base + s->size * objnr;
+ kpp->kp_objp = objp;
+ if (WARN_ON_ONCE(objp < base || objp >= base + page->objects * s->size || (objp - base) % s->size) ||
+ !(s->flags & SLAB_STORE_USER))
+ return;
+#ifdef CONFIG_SLUB_DEBUG
+ trackp = get_track(s, objp, TRACK_ALLOC);
+ kpp->kp_ret = (void *)trackp->addr;
+#ifdef CONFIG_STACKTRACE
+ for (i = 0; i < KS_ADDRS_COUNT && i < TRACK_ADDRS_COUNT; i++) {
+ kpp->kp_stack[i] = (void *)trackp->addrs[i];
+ if (!kpp->kp_stack[i])
+ break;
+ }
+#endif
+#endif
+}
+
/********************************************************************
* Kmalloc subsystem
*******************************************************************/