[PATCH v2 4/5] uaccess: Disable -Wshadow in __scoped_user_access()

[david.laight.linux at gmail.com]

From: David Laight <david.laight.linux at gmail.com>

-Wshadow is enabled by W=2 builds and __scoped_user_access() quite
deliberately creates a 'const' shadow of the 'user' address that
references a 'guard page' when the application passes a kernel pointer.

Signed-off-by: David Laight <david.laight.linux at gmail.com>
---
 include/linux/uaccess.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index 64bc2492eb99..445391ec5a6d 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -739,7 +739,9 @@ static __always_inline void __scoped_user_rw_access_end(const void *p)
 #define __scoped_user_access(mode, uptr, size, elbl)					\
 	with (auto _tmpptr = __scoped_user_access_begin(mode, uptr, size, elbl))	\
 		/* Force modified pointer usage within the scope */			\
-		and_with (const auto uptr __cleanup(__scoped_user_##mode##_access_end) = _tmpptr)
+		__diag_push() __diag_ignore_all("-Wshadow", "uptr is readonly copy")	\
+		and_with (const auto uptr __cleanup(__scoped_user_##mode##_access_end) = _tmpptr) \
+		__diag_pop()
 
 /**
  * scoped_user_read_access_size - Start a scoped user read access with given size
-- 
2.39.5