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Subject: [PATCH 2/5] mm: Add VM_FAULT_ARCH_* codes
Date:   Fri,  2 Dec 2022 19:03:53 -0800
Message-Id: <20221203030356.3917-3-palmer@rivosinc.com>
In-Reply-To: <20221203030356.3917-1-palmer@rivosinc.com>
References: <20221203030356.3917-1-palmer@rivosinc.com>
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Cc:     Palmer Dabbelt <palmer@rivosinc.com>
From:   Palmer Dabbelt <palmer@rivosinc.com>
To:        linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
           linux-s390@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Precedence: bulk

A handful of architectures (arm, s390, and soon RISC-V) define their
own internal fault codes, so instead dedicate a few standard codes as
being architecture-specific to avoid conflicts.

Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
---
 include/linux/mm_types.h | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 758eb70829cb..df1aa8d58444 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -880,6 +880,11 @@ enum vm_fault_reason {
 	VM_FAULT_NEEDDSYNC      = (__force vm_fault_t)0x0002000,
 	VM_FAULT_COMPLETED      = (__force vm_fault_t)0x0004000,
 	VM_FAULT_HINDEX_MASK    = (__force vm_fault_t)0x00f0000,
+	VM_FAULT_ARCH_0         = (__force vm_fault_t)0x0100000,
+	VM_FAULT_ARCH_1         = (__force vm_fault_t)0x0200000,
+	VM_FAULT_ARCH_2         = (__force vm_fault_t)0x0400000,
+	VM_FAULT_ARCH_3         = (__force vm_fault_t)0x0800000,
+	VM_FAULT_ARCH_4         = (__force vm_fault_t)0x1000000,
 };
 
 /* Encode hstate index for a hwpoisoned large page */
@@ -903,7 +908,12 @@ enum vm_fault_reason {
 	{ VM_FAULT_RETRY,               "RETRY" },	\
 	{ VM_FAULT_FALLBACK,            "FALLBACK" },	\
 	{ VM_FAULT_DONE_COW,            "DONE_COW" },	\
-	{ VM_FAULT_NEEDDSYNC,           "NEEDDSYNC" }
+	{ VM_FAULT_NEEDDSYNC,           "NEEDDSYNC" },  \
+	{ VM_FAULT_ARCH_0,              "ARCH_0" },     \
+	{ VM_FAULT_ARCH_1,              "ARCH_1" },     \
+	{ VM_FAULT_ARCH_2,              "ARCH_2" },     \
+	{ VM_FAULT_ARCH_3,              "ARCH_3" },     \
+	{ VM_FAULT_ARCH_4,              "ARCH_4" },     \
 
 struct vm_special_mapping {
 	const char *name;	/* The name, e.g. "[vdso]". */
-- 
2.38.1