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alloc_tag: outline and export free_reserved_page()

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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@google.com
Fixes: dcfe378c81 ("lib: introduce support for page allocation tagging")
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202407080044.DWMC9N9I-lkp@intel.com/
Suggested-by: Christoph Hellwig <hch@infradead.org>
Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Sourav Panda <souravpanda@google.com>
Cc: <stable@vger.kernel.org>	[6.10]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Suren Baghdasaryan 2024-07-17 14:28:44 -07:00 committed by Andrew Morton
parent bf6acd5d16
commit b3bebe4430
2 changed files with 18 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
include/linux/mm.h
View File

@ -3137,21 +3137,7 @@ extern void reserve_bootmem_region(phys_addr_t start,
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)

17
mm/page_alloc.c
View File

@ -5815,6 +5815,23 @@ unsigned long free_reserved_area(void *start, void *end, int poison, const char
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;