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From: Christoph Hellwig <hch@lst.de>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-arch@vger.kernel.org, linux-riscv@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 3/8] asm-generic: add nommu implementations of __{get, put}_kernel_nofault
Date: Mon,  7 Sep 2020 07:58:20 +0200	[thread overview]
Message-ID: <20200907055825.1917151-4-hch@lst.de> (raw)
In-Reply-To: <20200907055825.1917151-1-hch@lst.de>

Add native implementations of __{get,put}_kernel_nofault using
{get,put}_unaligned, just like the {get,put}_user implementations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/asm-generic/uaccess.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h
index 6de5f524e9e631..b367f339be1a90 100644
--- a/include/asm-generic/uaccess.h
+++ b/include/asm-generic/uaccess.h
@@ -61,6 +61,22 @@ static inline int __put_user_fn(size_t size, void __user *to, void *from)
 }
 #define __put_user_fn(sz, u, k)	__put_user_fn(sz, u, k)
 
+#define __get_kernel_nofault(dst, src, type, err_label)			\
+do {									\
+	*((type *)dst) = get_unaligned((type *)(src));			\
+	if (0) /* make sure the label looks used to the compiler */	\
+		goto err_label;						\
+} while (0)
+
+#define __put_kernel_nofault(dst, src, type, err_label)			\
+do {									\
+	put_unaligned(*((type *)src), (type *)(dst));			\
+	if (0) /* make sure the label looks used to the compiler */	\
+		goto err_label;						\
+} while (0)
+
+#define HAVE_GET_KERNEL_NOFAULT 1
+
 static inline __must_check unsigned long
 raw_copy_from_user(void *to, const void __user * from, unsigned long n)
 {
-- 
2.28.0


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  parent reply	other threads:[~2020-09-07  5:58 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-07  5:58 remove set_fs for riscv v2 Christoph Hellwig
2020-09-07  5:58 ` [PATCH 1/8] uaccess: provide a generic TASK_SIZE_MAX definition Christoph Hellwig
2020-09-07  5:58 ` [PATCH 2/8] asm-generic: improve the nommu {get,put}_user handling Christoph Hellwig
2020-09-07  5:58 ` Christoph Hellwig [this message]
2020-09-07  5:58 ` [PATCH 4/8] asm-generic: make the set_fs implementation optional Christoph Hellwig
2020-09-07  5:58 ` [PATCH 5/8] riscv: use memcpy based uaccess for nommu again Christoph Hellwig
2020-09-09  4:59   ` Palmer Dabbelt
2020-09-07  5:58 ` [PATCH 6/8] riscv: refactor __get_user and __put_user Christoph Hellwig
2020-09-09  4:59   ` Palmer Dabbelt
2020-09-07  5:58 ` [PATCH 7/8] riscv: implement __get_kernel_nofault and __put_user_nofault Christoph Hellwig
2020-09-09  4:59   ` Palmer Dabbelt
2020-09-07  5:58 ` [PATCH 8/8] riscv: remove address space overrides using set_fs() Christoph Hellwig
2020-09-09  4:59   ` Palmer Dabbelt
2020-09-09  4:59 ` remove set_fs for riscv v2 Palmer Dabbelt
2020-09-09  6:55   ` Christoph Hellwig
2020-09-09 20:38     ` Palmer Dabbelt
2020-09-22  4:37     ` Christoph Hellwig
2020-09-26 17:50       ` Palmer Dabbelt
2020-09-26 19:13         ` Arnd Bergmann
2020-10-04 17:27           ` Palmer Dabbelt
2020-09-28 12:49         ` Christoph Hellwig
2020-09-28 16:45           ` Palmer Dabbelt
2020-09-29 18:03             ` Christoph Hellwig
2020-09-26  6:58 ` Christoph Hellwig

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