The patch titled
Subject: mm/page_ext.c: constify lookup_page_ext() argument
has been added to the -mm tree. Its filename is
mm-page_ext-constify-lookup_page_ext-argument.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_ext-constify-lookup_page_ext-argument.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_ext-constify-lookup_page_ext-argument.patch
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------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: mm/page_ext.c: constify lookup_page_ext() argument
lookup_page_ext() finds 'struct page_ext' for a given page. It requires
only read access to the given struct page.
Current implemnentation takes 'struct page *' as an argument. It makes
compiler complain when 'const struct page *' passed.
Change the argument to 'const struct page *'.
Link: http://lkml.kernel.org/r/20180531135457.20167-3-kirill.shutemov@xxxxxxxxxxxxxxx
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Vinayak Menon <vinmenon@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/page_ext.h | 4 ++--
mm/page_ext.c | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
diff -puN include/linux/page_ext.h~mm-page_ext-constify-lookup_page_ext-argument include/linux/page_ext.h
--- a/include/linux/page_ext.h~mm-page_ext-constify-lookup_page_ext-argument
+++ a/include/linux/page_ext.h
@@ -50,7 +50,7 @@ static inline void page_ext_init(void)
}
#endif
-struct page_ext *lookup_page_ext(struct page *page);
+struct page_ext *lookup_page_ext(const struct page *page);
#else /* !CONFIG_PAGE_EXTENSION */
struct page_ext;
@@ -59,7 +59,7 @@ static inline void pgdat_page_ext_init(s
{
}
-static inline struct page_ext *lookup_page_ext(struct page *page)
+static inline struct page_ext *lookup_page_ext(const struct page *page)
{
return NULL;
}
diff -puN mm/page_ext.c~mm-page_ext-constify-lookup_page_ext-argument mm/page_ext.c
--- a/mm/page_ext.c~mm-page_ext-constify-lookup_page_ext-argument
+++ a/mm/page_ext.c
@@ -120,7 +120,7 @@ void __meminit pgdat_page_ext_init(struc
pgdat->node_page_ext = NULL;
}
-struct page_ext *lookup_page_ext(struct page *page)
+struct page_ext *lookup_page_ext(const struct page *page)
{
unsigned long pfn = page_to_pfn(page);
unsigned long index;
@@ -195,7 +195,7 @@ fail:
#else /* CONFIG_FLAT_NODE_MEM_MAP */
-struct page_ext *lookup_page_ext(struct page *page)
+struct page_ext *lookup_page_ext(const struct page *page)
{
unsigned long pfn = page_to_pfn(page);
struct mem_section *section = __pfn_to_section(pfn);
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
mm-page_ext-drop-definition-of-unused-page_ext_debug_poison.patch
mm-page_ext-constify-lookup_page_ext-argument.patch
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