Commit e505a063ba ("translate-all: Add assert_(memory|tb)_lock
annotations") states page_set_flags() is "public APIs and [is]
documented as needing them held for linux-user mode".
Document the prototype.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 include/exec/cpu-all.h | 13 +++++++++++++
 accel/tcg/user-exec.c  |  5 -----
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index 6f09b86e7f..45e6676938 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -166,7 +166,20 @@ typedef int (*walk_memory_regions_fn)(void *, target_ulong,
 int walk_memory_regions(void *, walk_memory_regions_fn);
 
 int page_get_flags(target_ulong address);
+
+/**
+ * page_set_flags:
+ * @start: first byte of range
+ * @last: last byte of range
+ * @flags: flags to set
+ * Context: holding mmap lock
+ *
+ * Modify the flags of a page and invalidate the code if necessary.
+ * The flag PAGE_WRITE_ORG is positioned automatically depending
+ * on PAGE_WRITE.  The mmap_lock should already be held.
+ */
 void page_set_flags(target_ulong start, target_ulong last, int flags);
+
 void page_reset_target_data(target_ulong start, target_ulong last);
 
 /**
diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
index 7ddc47b0ba..11b6d45e90 100644
--- a/accel/tcg/user-exec.c
+++ b/accel/tcg/user-exec.c
@@ -485,11 +485,6 @@ static bool pageflags_set_clear(target_ulong start, target_ulong last,
     return inval_tb;
 }
 
-/*
- * Modify the flags of a page and invalidate the code if necessary.
- * The flag PAGE_WRITE_ORG is positioned automatically depending
- * on PAGE_WRITE.  The mmap_lock should already be held.
- */
 void page_set_flags(target_ulong start, target_ulong last, int flags)
 {
     bool reset = false;
-- 
2.45.2