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From:   Ankur Arora <ankur.a.arora@oracle.com>
To:     linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org
Cc:     mingo@kernel.org, bp@alien8.de, luto@kernel.org,
        akpm@linux-foundation.org, mike.kravetz@oracle.com,
        jon.grimm@amd.com, kvm@vger.kernel.org, konrad.wilk@oracle.com,
        boris.ostrovsky@oracle.com, Ankur Arora <ankur.a.arora@oracle.com>
Subject: [PATCH v2 06/14] sparse: add address_space __incoherent
Date:   Wed, 20 Oct 2021 10:02:57 -0700
Message-Id: <20211020170305.376118-7-ankur.a.arora@oracle.com>
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Some CPU architectures provide store instructions that are weakly
ordered with respect to other instructions that operate on the memory
hierarchy.
Add sparse address_space __incoherent to denote pointers used to
operate over these regions.

Signed-off-by: Ankur Arora <ankur.a.arora@oracle.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 b6ff83a714ca..f7f68d7bc494 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -11,6 +11,7 @@
 # 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 */
@@ -37,6 +38,7 @@ static inline void __chk_io_ptr(const volatile void __iomem *ptr) { }
 # define __iomem
 # define __percpu
 # define __rcu
+# define __incoherent
 # define __chk_user_ptr(x)	(void)0
 # define __chk_io_ptr(x)	(void)0
 /* context/locking */
-- 
2.29.2