From: David Laight <[email protected]> -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 <[email protected]> --- 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
