[PATCH 1/3] lib: add missing newline character in the warning message

[PATCH 1/3] lib: add missing newline character in the warning message

[Suren Baghdasaryan]

Fixes: 22d407b164ff ("lib: add allocation tagging support for memory allocation profiling")
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
---
 include/linux/alloc_tag.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/alloc_tag.h b/include/linux/alloc_tag.h
index abd24016a900..8c61ccd161ba 100644
--- a/include/linux/alloc_tag.h
+++ b/include/linux/alloc_tag.h
@@ -122,7 +122,7 @@ static inline void alloc_tag_add_check(union codetag_ref *ref, struct alloc_tag
 		  "alloc_tag was not cleared (got tag for %s:%u)\n",
 		  ref->ct->filename, ref->ct->lineno);
 
-	WARN_ONCE(!tag, "current->alloc_tag not set");
+	WARN_ONCE(!tag, "current->alloc_tag not set\n");
 }
 
 static inline void alloc_tag_sub_check(union codetag_ref *ref)

base-commit: 8a18fda0febb7790de20ec1c3b4522ce026be1c6
-- 
2.45.2.993.g49e7a77208-goog

[PATCH 2/3] lib: reuse page_ext_data() to obtain codetag_ref

[Suren Baghdasaryan]

codetag_ref_from_page_ext() reimplements the same calculation as
page_ext_data(). Reuse existing function instead.

Fixes: dcfe378c81f7 ("lib: introduce support for page allocation tagging")
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
---
 include/linux/pgalloc_tag.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/pgalloc_tag.h b/include/linux/pgalloc_tag.h
index 9cacadbd61f8..acb1e9ce7981 100644
--- a/include/linux/pgalloc_tag.h
+++ b/include/linux/pgalloc_tag.h
@@ -15,7 +15,7 @@ extern struct page_ext_operations page_alloc_tagging_ops;
 
 static inline union codetag_ref *codetag_ref_from_page_ext(struct page_ext *page_ext)
 {
-	return (void *)page_ext + page_alloc_tagging_ops.offset;
+	return (union codetag_ref *)page_ext_data(page_ext, &page_alloc_tagging_ops);
 }
 
 static inline struct page_ext *page_ext_from_codetag_ref(union codetag_ref *ref)
-- 
2.45.2.993.g49e7a77208-goog

[PATCH 3/3] alloc_tag: fix page_ext_get/page_ext_put sequence during page splitting

[Suren Baghdasaryan]

pgalloc_tag_sub() might call page_ext_put() using a page different from
the one used in page_ext_get() call. This does not pose an issue since
page_ext_put() ignores this parameter as long as it's non-NULL but
technically this is wrong. Fix it by storing the original page used in
page_ext_get() and passing it to page_ext_put().

Fixes: be25d1d4e822 ("mm: create new codetag references during page splitting")
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
---
 include/linux/pgalloc_tag.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/pgalloc_tag.h b/include/linux/pgalloc_tag.h
index acb1e9ce7981..18cd0c0c73d9 100644
--- a/include/linux/pgalloc_tag.h
+++ b/include/linux/pgalloc_tag.h
@@ -71,6 +71,7 @@ static inline void pgalloc_tag_sub(struct page *page, unsigned int nr)
 static inline void pgalloc_tag_split(struct page *page, unsigned int nr)
 {
 	int i;
+	struct page_ext *first_page_ext;
 	struct page_ext *page_ext;
 	union codetag_ref *ref;
 	struct alloc_tag *tag;
@@ -78,7 +79,7 @@ static inline void pgalloc_tag_split(struct page *page, unsigned int nr)
 	if (!mem_alloc_profiling_enabled())
 		return;
 
-	page_ext = page_ext_get(page);
+	first_page_ext = page_ext = page_ext_get(page);
 	if (unlikely(!page_ext))
 		return;
 
@@ -94,7 +95,7 @@ static inline void pgalloc_tag_split(struct page *page, unsigned int nr)
 		page_ext = page_ext_next(page_ext);
 	}
 out:
-	page_ext_put(page_ext);
+	page_ext_put(first_page_ext);
 }
 
 static inline struct alloc_tag *pgalloc_tag_get(struct page *page)
-- 
2.45.2.993.g49e7a77208-goog

Re: [PATCH 1/3] lib: add missing newline character in the warning message

[Suren Baghdasaryan]

On Thu, Jul 11, 2024 at 3:05 PM Suren Baghdasaryan <surenb@google.com> wrote:
>
> Fixes: 22d407b164ff ("lib: add allocation tagging support for memory allocation profiling")
> Signed-off-by: Suren Baghdasaryan <surenb@google.com>

The fixes in this patchset are cleanups, not critical and not urgent.
Thanks,
Suren.

> ---
>  include/linux/alloc_tag.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/alloc_tag.h b/include/linux/alloc_tag.h
> index abd24016a900..8c61ccd161ba 100644
> --- a/include/linux/alloc_tag.h
> +++ b/include/linux/alloc_tag.h
> @@ -122,7 +122,7 @@ static inline void alloc_tag_add_check(union codetag_ref *ref, struct alloc_tag
>                   "alloc_tag was not cleared (got tag for %s:%u)\n",
>                   ref->ct->filename, ref->ct->lineno);
>
> -       WARN_ONCE(!tag, "current->alloc_tag not set");
> +       WARN_ONCE(!tag, "current->alloc_tag not set\n");
>  }
>
>  static inline void alloc_tag_sub_check(union codetag_ref *ref)
>
> base-commit: 8a18fda0febb7790de20ec1c3b4522ce026be1c6
> --
> 2.45.2.993.g49e7a77208-goog
>