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-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Subject: [PATCH 7/8] riscv: implement __get_kernel_nofault and __put_user_nofault Date: Mon, 7 Sep 2020 07:58:24 +0200 [thread overview] Message-ID: <20200907055825.1917151-8-hch@lst.de> (raw) In-Reply-To: <20200907055825.1917151-1-hch@lst.de> Implement the non-faulting kernel access helpers directly instead of abusing the uaccess routines under set_fs(KERNEL_DS). Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/riscv/include/asm/uaccess.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h index b67d1c616ec348..264e52fb62b143 100644 --- a/arch/riscv/include/asm/uaccess.h +++ b/arch/riscv/include/asm/uaccess.h @@ -486,6 +486,26 @@ unsigned long __must_check clear_user(void __user *to, unsigned long n) __ret; \ }) +#define HAVE_GET_KERNEL_NOFAULT + +#define __get_kernel_nofault(dst, src, type, err_label) \ +do { \ + long __kr_err; \ + \ + __get_user_nocheck(*((type *)(dst)), (type *)(src), __kr_err); \ + if (unlikely(__kr_err)) \ + goto err_label; \ +} while (0) + +#define __put_kernel_nofault(dst, src, type, err_label) \ +do { \ + long __kr_err; \ + \ + __put_user_nocheck(*((type *)(dst)), (type *)(src), __kr_err); \ + if (unlikely(__kr_err)) \ + goto err_label; \ +} while (0) + #else /* CONFIG_MMU */ #include <asm-generic/uaccess.h> #endif /* CONFIG_MMU */ -- 2.28.0
WARNING: multiple messages have this Message-ID (diff)
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 7/8] riscv: implement __get_kernel_nofault and __put_user_nofault Date: Mon, 7 Sep 2020 07:58:24 +0200 [thread overview] Message-ID: <20200907055825.1917151-8-hch@lst.de> (raw) In-Reply-To: <20200907055825.1917151-1-hch@lst.de> Implement the non-faulting kernel access helpers directly instead of abusing the uaccess routines under set_fs(KERNEL_DS). Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/riscv/include/asm/uaccess.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h index b67d1c616ec348..264e52fb62b143 100644 --- a/arch/riscv/include/asm/uaccess.h +++ b/arch/riscv/include/asm/uaccess.h @@ -486,6 +486,26 @@ unsigned long __must_check clear_user(void __user *to, unsigned long n) __ret; \ }) +#define HAVE_GET_KERNEL_NOFAULT + +#define __get_kernel_nofault(dst, src, type, err_label) \ +do { \ + long __kr_err; \ + \ + __get_user_nocheck(*((type *)(dst)), (type *)(src), __kr_err); \ + if (unlikely(__kr_err)) \ + goto err_label; \ +} while (0) + +#define __put_kernel_nofault(dst, src, type, err_label) \ +do { \ + long __kr_err; \ + \ + __put_user_nocheck(*((type *)(dst)), (type *)(src), __kr_err); \ + if (unlikely(__kr_err)) \ + goto err_label; \ +} while (0) + #else /* CONFIG_MMU */ #include <asm-generic/uaccess.h> #endif /* CONFIG_MMU */ -- 2.28.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv
next prev parent reply other threads:[~2020-09-07 5:59 UTC|newest] Thread overview: 50+ 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 ` 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 ` 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 2020-09-07 5:58 ` [PATCH 3/8] asm-generic: add nommu implementations of __{get,put}_kernel_nofault Christoph Hellwig 2020-09-07 5:58 ` [PATCH 3/8] asm-generic: add nommu implementations of __{get, put}_kernel_nofault Christoph Hellwig 2020-09-07 5:58 ` [PATCH 4/8] asm-generic: make the set_fs implementation optional Christoph Hellwig 2020-09-07 5:58 ` Christoph Hellwig 2020-09-07 5:58 ` [PATCH 5/8] riscv: use memcpy based uaccess for nommu again Christoph Hellwig 2020-09-07 5:58 ` Christoph Hellwig 2020-09-09 4:59 ` Palmer Dabbelt 2020-09-09 4:59 ` Palmer Dabbelt 2020-09-07 5:58 ` [PATCH 6/8] riscv: refactor __get_user and __put_user Christoph Hellwig 2020-09-07 5:58 ` Christoph Hellwig 2020-09-09 4:59 ` Palmer Dabbelt 2020-09-09 4:59 ` Palmer Dabbelt 2020-09-07 5:58 ` Christoph Hellwig [this message] 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 2020-09-09 4:59 ` Palmer Dabbelt 2020-09-07 5:58 ` [PATCH 8/8] riscv: remove address space overrides using set_fs() Christoph Hellwig 2020-09-07 5:58 ` Christoph Hellwig 2020-09-09 4:59 ` Palmer Dabbelt 2020-09-09 4:59 ` Palmer Dabbelt 2020-09-09 4:59 ` remove set_fs for riscv v2 Palmer Dabbelt 2020-09-09 4:59 ` Palmer Dabbelt 2020-09-09 6:55 ` Christoph Hellwig 2020-09-09 6:55 ` Christoph Hellwig 2020-09-09 20:38 ` Palmer Dabbelt 2020-09-09 20:38 ` Palmer Dabbelt 2020-09-22 4:37 ` Christoph Hellwig 2020-09-22 4:37 ` Christoph Hellwig 2020-09-26 17:50 ` Palmer Dabbelt 2020-09-26 17:50 ` Palmer Dabbelt 2020-09-26 19:13 ` Arnd Bergmann 2020-09-26 19:13 ` Arnd Bergmann 2020-10-04 17:27 ` Palmer Dabbelt 2020-10-04 17:27 ` Palmer Dabbelt 2020-09-28 12:49 ` Christoph Hellwig 2020-09-28 12:49 ` Christoph Hellwig 2020-09-28 16:45 ` Palmer Dabbelt 2020-09-28 16:45 ` Palmer Dabbelt 2020-09-29 18:03 ` Christoph Hellwig 2020-09-29 18:03 ` Christoph Hellwig 2020-09-26 6:58 ` Christoph Hellwig 2020-09-26 6:58 ` Christoph Hellwig -- strict thread matches above, loose matches on Subject: below -- 2020-09-04 16:52 remove set_fs for riscv Christoph Hellwig 2020-09-04 16:52 ` [PATCH 7/8] riscv: implement __get_kernel_nofault and __put_user_nofault Christoph Hellwig 2020-09-04 16:52 ` Christoph Hellwig
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