The patch titled
Subject: alloc_tag: outline and export free_reserved_page()
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
alloc_tag-outline-and-export-free_reserved_page.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/alloc_tag-outline-and-export-free_reserved_page.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: alloc_tag: outline and export free_reserved_page()
Date: Wed, 17 Jul 2024 14:28:44 -0700
Outline and export free_reserved_page() because modules use it and it in
turn uses page_ext_{get|put} which should not be exported. The same
result could be obtained by outlining {get|put}_page_tag_ref() but that
would have higher performance impact as these functions are used in more
performance critical paths.
Link: https://lkml.kernel.org/r/20240717212844.2749975-1-surenb@xxxxxxxxxx
Fixes: dcfe378c81f7 ("lib: introduce support for page allocation tagging")
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202407080044.DWMC9N9I-lkp@xxxxxxxxx/
Suggested-by: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Suggested-by: Vlastimil Babka <vbabka@xxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Cc: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Sourav Panda <souravpanda@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [6.10]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 16 +---------------
mm/page_alloc.c | 17 +++++++++++++++++
2 files changed, 18 insertions(+), 15 deletions(-)
--- a/include/linux/mm.h~alloc_tag-outline-and-export-free_reserved_page
+++ a/include/linux/mm.h
@@ -3177,21 +3177,7 @@ extern void reserve_bootmem_region(phys_
phys_addr_t end, int nid);
/* Free the reserved page into the buddy system, so it gets managed. */
-static inline void free_reserved_page(struct page *page)
-{
- if (mem_alloc_profiling_enabled()) {
- union codetag_ref *ref = get_page_tag_ref(page);
-
- if (ref) {
- set_codetag_empty(ref);
- put_page_tag_ref(ref);
- }
- }
- ClearPageReserved(page);
- init_page_count(page);
- __free_page(page);
- adjust_managed_page_count(page, 1);
-}
+void free_reserved_page(struct page *page);
#define free_highmem_page(page) free_reserved_page(page)
static inline void mark_page_reserved(struct page *page)
--- a/mm/page_alloc.c~alloc_tag-outline-and-export-free_reserved_page
+++ a/mm/page_alloc.c
@@ -5805,6 +5805,23 @@ unsigned long free_reserved_area(void *s
return pages;
}
+void free_reserved_page(struct page *page)
+{
+ if (mem_alloc_profiling_enabled()) {
+ union codetag_ref *ref = get_page_tag_ref(page);
+
+ if (ref) {
+ set_codetag_empty(ref);
+ put_page_tag_ref(ref);
+ }
+ }
+ ClearPageReserved(page);
+ init_page_count(page);
+ __free_page(page);
+ adjust_managed_page_count(page, 1);
+}
+EXPORT_SYMBOL(free_reserved_page);
+
static int page_alloc_cpu_dead(unsigned int cpu)
{
struct zone *zone;
_
Patches currently in -mm which might be from surenb@xxxxxxxxxx are
alloc_tag-outline-and-export-free_reserved_page.patch
