This fixes API breakage introduced in v4.4.168 commit 8e50b8b07f46 ("mm: replace get_user_pages() write/force parameters with gup_flags"). For example odious nvidia out-of-tree modules does not compile.
After that commit prototype of get_user_pages() looks like:
long get_user_pages(task, mm, start, nr_pages, gup_flags, pages, vmas)
that's incompatible neither with v4.4 and before:
long get_user_pages(task, mm, start, nr_pages, write, force, pages, vmas)
nor with v4.6 and later:
long get_user_pages(start, nr_pages, gup_flags, pages, vmas)
This patch uses the same va-args macro magic as commit cde70140fed8 ("mm/gup: Overload get_user_pages() functions").
The alternative is upgrading GUP API to modern state.
Signed-off-by: Konstantin Khlebnikov khlebnikov@yandex-team.ru --- include/linux/mm.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h index 77066c96f5e9..5337d4b59052 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2334,5 +2334,28 @@ void __init setup_nr_node_ids(void); static inline void setup_nr_node_ids(void) {} #endif
+#ifdef MODULE + +/* Compat API for external modules */ + +static inline __deprecated +long get_user_pages8(struct task_struct *tsk, struct mm_struct *mm, + unsigned long start, unsigned long nr_pages, + int write, int force, struct page **pages, + struct vm_area_struct **vmas) +{ + return get_user_pages(tsk, mm, start, nr_pages, + (write ? FOLL_WRITE : 0) | + (force ? FOLL_FORCE : 0), + pages, vmas); +} + +#define GUP_MACRO(_1, _2, _3, _4, _5, _6, _7, _8, gup, ...) gup + +#define get_user_pages(...) GUP_MACRO(__VA_ARGS__, \ + get_user_pages8, get_user_pages, x, x, x, x, x, x)(__VA_ARGS__) + +#endif /* MODULE */ + #endif /* __KERNEL__ */ #endif /* _LINUX_MM_H */