Otherwise it causes a gcc warning:
../mm/filemap.c:830:14: warning: no previous prototype for
`__add_to_page_cache_locked' [-Wmissing-prototypes]
A previous attempt to make this function static led to compilation
errors when CONFIG_DEBUG_INFO_BTF is enabled because
__add_to_page_cache_locked() is referred to by BPF code.
Adding a prototype will silence the warning.
Signed-off-by: Souptick Joarder <jrdr.li...@gmail.com>
Cc: Alex Shi <alex....@linux.alibaba.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Matthew Wilcox <wi...@infradead.org>
---
include/linux/mm.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5299b90a..c1e9081 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -216,6 +216,13 @@ int overcommit_kbytes_handler(struct ctl_table *, int,
void *, size_t *,
loff_t *);
int overcommit_policy_handler(struct ctl_table *, int, void *, size_t *,
loff_t *);
+/*
+ * Any attempt to mark this function as static leads to build failure
+ * when CONFIG_DEBUG_INFO_BTF is enabled because __add_to_page_cache_locked()
+ * is referred to by BPF code. This must be visible for error injection.
+ */
+int __add_to_page_cache_locked(struct page *page, struct address_space
*mapping,
+ pgoff_t index, gfp_t gfp, void **shadowp);
#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
--
1.9.1
