kasan-page_alloc-move-tag_clear_highpage-out-of-kernel_init_free_pages.patch removed from -mm tree

The patch titled
Subject: kasan, page_alloc: move tag_clear_highpage out of kernel_init_free_pages
has been removed from the -mm tree. Its filename was
kasan-page_alloc-move-tag_clear_highpage-out-of-kernel_init_free_pages.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Andrey Konovalov <[email protected]>
Subject: kasan, page_alloc: move tag_clear_highpage out of kernel_init_free_pages

Currently, kernel_init_free_pages() serves two purposes: it either only zeroes memory or zeroes both memory and memory tags via a different code path. As this function has only two callers, each using only one code path, this behaviour is confusing.

Pull the code that zeroes both memory and tags out of kernel_init_free_pages().

As a result of this change, the code in free_pages_prepare() starts to look complicated, but this is improved in the few following patches. Those improvements are not integrated into this patch to make diffs easier to read.

This patch does no functional changes.

---

 mm/page_alloc.c |   24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

@@ -1278,16 +1278,10 @@ static inline bool should_skip_kasan_poi
 	       PageSkipKASanPoison(page);
 }
 
-static void kernel_init_free_pages(struct page *page, int numpages, bool zero_tags)
+static void kernel_init_free_pages(struct page *page, int numpages)
 {
 	int i;
 
-	if (zero_tags) {
-		for (i = 0; i < numpages; i++)
-			tag_clear_highpage(page + i);
-		return;
-	}
-
 	/* s390's use of memset() could override KASAN redzones. */
 	kasan_disable_current();
 	for (i = 0; i < numpages; i++) {

@@ -1383,7 +1377,7 @@ static __always_inline bool free_pages_p
 		bool init = want_init_on_free();
 
 		if (init)
-			kernel_init_free_pages(page, 1 << order, false);
+			kernel_init_free_pages(page, 1 << order);
 		if (!skip_kasan_poison)
 			kasan_poison_pages(page, order, init);
 	}

@@ -2378,9 +2372,17 @@ inline void post_alloc_hook(struct page
 		bool init = !want_init_on_free() && want_init_on_alloc(gfp_flags);
 
 		kasan_unpoison_pages(page, order, init);
-		if (init)
-			kernel_init_free_pages(page, 1 << order,
-					       gfp_flags & __GFP_ZEROTAGS);
+
+		if (init) {
+			if (gfp_flags & __GFP_ZEROTAGS) {
+				int i;
+
+				for (i = 0; i < 1 << order; i++)
+					tag_clear_highpage(page + i);
+			} else {
+				kernel_init_free_pages(page, 1 << order);
+			}
+		}
 	}
 
 	set_page_owner(page, order, gfp_flags);

_

Patches currently in -mm which might be from [email protected] are

stacktrace-add-interface-based-on-shadow-call-stack.patch arm64-scs-save-scs_sp-values-per-cpu-when-switching-stacks.patch arm64-implement-stack_trace_save_shadow.patch kasan-use-stack_trace_save_shadow.patch