TODO: no meaningful description here yet, please see the cover letter
      for this RFC series.

Signed-off-by: Andrey Konovalov <redacted>
Link: https://linux-review.googlesource.com/id/If7d37003875b2ed3e0935702c8015c223d6416a4
---
 mm/kasan/common.c  |  92 +++++++++++++-----------
 mm/kasan/generic.c |   5 ++
 mm/kasan/hw_tags.c | 169 ++++++++++++++++++++++++++++++++++++++++++++-
 mm/kasan/kasan.h   |   9 +++
 mm/kasan/report.c  |  14 +++-
 mm/kasan/sw_tags.c |   5 ++
 6 files changed, 250 insertions(+), 44 deletions(-)

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 1a5e6c279a72..cc129ef62ab1 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c

@@ -129,35 +129,37 @@ void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
        unsigned int redzone_size;
        int redzone_adjust;

-       /* Add alloc meta. */
-       cache->kasan_info.alloc_meta_offset = *size;
-       *size += sizeof(struct kasan_alloc_meta);
-
-       /* Add free meta. */
-       if (IS_ENABLED(CONFIG_KASAN_GENERIC) &&
-           (cache->flags & SLAB_TYPESAFE_BY_RCU || cache->ctor ||
-            cache->object_size < sizeof(struct kasan_free_meta))) {
-               cache->kasan_info.free_meta_offset = *size;
-               *size += sizeof(struct kasan_free_meta);
-       }
-
-       redzone_size = optimal_redzone(cache->object_size);
-       redzone_adjust = redzone_size - (*size - cache->object_size);
-       if (redzone_adjust > 0)
-               *size += redzone_adjust;
-
-       *size = min_t(unsigned int, KMALLOC_MAX_SIZE,
-                       max(*size, cache->object_size + redzone_size));
+       if (static_branch_unlikely(&kasan_stack)) {