linux-kernel - [PATCH v3 12/21] sparse: add address_space _

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Date:   Mon,  6 Jun 2022 20:37:16 +0000
From:   Ankur Arora <ankur.a.arora@...cle.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org
Cc:     torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
        mike.kravetz@...cle.com, mingo@...nel.org, luto@...nel.org,
        tglx@...utronix.de, bp@...en8.de, peterz@...radead.org,
        ak@...ux.intel.com, arnd@...db.de, jgg@...dia.com,
        jon.grimm@....com, boris.ostrovsky@...cle.com,
        konrad.wilk@...cle.com, joao.m.martins@...cle.com,
        ankur.a.arora@...cle.com
Subject: [PATCH v3 12/21] sparse: add address_space __incoherent

Some CPU architectures provide store instructions that are weakly
ordered with respect to rest of the local instruction stream.

Add sparse address_space __incoherent to denote regions used such.

Signed-off-by: Ankur Arora <ankur.a.arora@...cle.com>
---
 include/linux/compiler_types.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
index d08dfcb0ac68..8e3e736fc82f 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -19,6 +19,7 @@
 # define __iomem	__attribute__((noderef, address_space(__iomem)))
 # define __percpu	__attribute__((noderef, address_space(__percpu)))
 # define __rcu		__attribute__((noderef, address_space(__rcu)))
+# define __incoherent	__attribute__((noderef, address_space(__incoherent)))
 static inline void __chk_user_ptr(const volatile void __user *ptr) { }
 static inline void __chk_io_ptr(const volatile void __iomem *ptr) { }
 /* context/locking */
@@ -45,6 +46,7 @@ static inline void __chk_io_ptr(const volatile void __iomem *ptr) { }
 # define __iomem
 # define __percpu	BTF_TYPE_TAG(percpu)
 # define __rcu
+# define __incoherent
 # define __chk_user_ptr(x)	(void)0
 # define __chk_io_ptr(x)	(void)0
 /* context/locking */
-- 
2.31.1