invalid output size for constraint '=q' in drivers/gpu/drm/i915/i915_query.c

[tpimh]

A new case similar to of #194:

drivers/gpu/drm/i915/i915_query.c:263:7: error: invalid output size for constraint '=q'
                if (__get_user(config_id, &user_query_config_ptr->config))
                    ^
./arch/x86/include/asm/uaccess.h:529:2: note: expanded from macro '__get_user'
        __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
        ^
./arch/x86/include/asm/uaccess.h:450:18: note: expanded from macro '__get_user_nocheck'
        __get_user_size(__gu_val, __gu_ptr, __gu_size, __gu_err, -EFAULT);      \
                        ^
1 error generated.

How haven't I hit this earlier? 🤔

[tpimh]

Quick fix:

--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -349,7 +349,7 @@ do {									\
 	__chk_user_ptr(ptr);						\
 	switch (size) {							\
 	case 1:								\
-		__get_user_asm(x, ptr, retval, "b", "b", "=q", errret);	\
+		__get_user_asm(x, ptr, retval, "b", "b", "=r", errret);	\
 		break;							\
 	case 2:								\
 		__get_user_asm(x, ptr, retval, "w", "w", "=r", errret);	\
@@ -399,7 +399,7 @@ do {									\
 	__chk_user_ptr(ptr);						\
 	switch (size) {							\
 	case 1:								\
-		__get_user_asm_ex(x, ptr, "b", "b", "=q");		\
+		__get_user_asm_ex(x, ptr, "b", "b", "=r");		\
 		break;							\
 	case 2:								\
 		__get_user_asm_ex(x, ptr, "w", "w", "=r");		\

[nickdesaulniers]

or: https://github.com/ClangBuiltLinux/continuous-integration/pull/182/files#r419721727

[nickdesaulniers]

submitted: https://lore.kernel.org/lkml/20200504230309.237398-1-ndesaulniers@google.com/T/#u