public inbox for linux-kernel@vger.kernel.org
 help / color / mirror / Atom feed
* [RESEND PATCH] sparse: use static inline for __chk_{user,io}_ptr()
@ 2020-08-06 19:42 Luc Van Oostenryck
  2020-08-06 22:38 ` kernel test robot
  2020-08-07  0:44 ` kernel test robot
  0 siblings, 2 replies; 3+ messages in thread
From: Luc Van Oostenryck @ 2020-08-06 19:42 UTC (permalink / raw)
  To: Andrew Morton; +Cc: linux-kernel, Luc Van Oostenryck

__chk_user_ptr() & __chk_io_ptr() are dummy extern functions which
only exist to enforce the typechecking of __user or __iomem pointers
in macros when using sparse.

This typechecking is done by inserting a call to these functions.
But the presence of these calls can inhibit some simplifications
and so influence the result of sparse's analysis of context/locking.

Fix this by changing these calls into static inline calls with
an empty body.

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
---
 include/linux/compiler_types.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
index b67930216e45..a9b6699f3934 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -11,8 +11,8 @@
 # define __iomem	__attribute__((noderef, address_space(__iomem)))
 # define __percpu	__attribute__((noderef, address_space(__percpu)))
 # define __rcu		__attribute__((noderef, address_space(__rcu)))
-extern void __chk_user_ptr(const volatile void __user *);
-extern void __chk_io_ptr(const volatile void __iomem *);
+static inline void __chk_user_ptr(const volatile void __user *ptr) { }
+static inline void __chk_io_ptr(const volatile void __iomem *ptr) { }
 /* context/locking */
 # define __must_hold(x)	__attribute__((context(x,1,1)))
 # define __acquires(x)	__attribute__((context(x,0,1)))
-- 
2.28.0


^ permalink raw reply related	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2020-08-07  1:11 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-08-06 19:42 [RESEND PATCH] sparse: use static inline for __chk_{user,io}_ptr() Luc Van Oostenryck
2020-08-06 22:38 ` kernel test robot
2020-08-07  0:44 ` kernel test robot

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox