[PATCH v7 18/27] mm: Introduce do_mmap_locked()

Yu-cheng Yu
2019-06-06T20:15:36Z

There are a few places that need do_mmap() with mm->mmap_sem held.
Create an in-line function for that.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
---
include/linux/mm.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 398f1e1c35e5..7cf014604848 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2411,6 +2411,24 @@ static inline void mm_populate(unsigned long addr, unsigned long len)
static inline void mm_populate(unsigned long addr, unsigned long len) {}
#endif

+static inline unsigned long do_mmap_locked(unsigned long addr,
+ unsigned long len, unsigned long prot, unsigned long flags,
+ vm_flags_t vm_flags)
+{
+ struct mm_struct *mm = current->mm;
+ unsigned long populate;
+
+ down_write(&mm->mmap_sem);
+ addr = do_mmap(NULL, addr, len, prot, flags, vm_flags, 0,
+ &populate, NULL);
+ up_write(&mm->mmap_sem);
+
+ if (populate)
+ mm_populate(addr, populate);
+
+ return addr;
+}
+
/* These take the mm semaphore themselves */
extern int __must_check vm_brk(unsigned long, unsigned long);
extern int __must_check vm_brk_flags(unsigned long, unsigned long, unsigned long);
--
2.17.1