From: Tong Tiangen <tongtiangen@huawei.com>
To: Mark Rutland <mark.rutland@arm.com>,
James Morse <james.morse@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Robin Murphy <robin.murphy@arm.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>, <x86@kernel.org>,
"H . Peter Anvin" <hpa@zytor.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>,
Xie XiuQi <xiexiuqi@huawei.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Tong Tiangen <tongtiangen@huawei.com>,
Guohanjun <guohanjun@huawei.com>,
linuxppc-dev@lists.ozlabs.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH -next v7 1/4] uaccess: add generic fallback version of copy_mc_to_user()
Date: Fri, 12 Aug 2022 07:05:54 +0000 [thread overview]
Message-ID: <20220812070557.1028499-2-tongtiangen@huawei.com> (raw)
In-Reply-To: <20220812070557.1028499-1-tongtiangen@huawei.com>
x86/powerpc has it's implementation of copy_mc_to_user(), we add generic
fallback in include/linux/uaccess.h prepare for other architechures to
enable CONFIG_ARCH_HAS_COPY_MC.
Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
---
arch/powerpc/include/asm/uaccess.h | 1 +
arch/x86/include/asm/uaccess.h | 1 +
include/linux/uaccess.h | 9 +++++++++
3 files changed, 11 insertions(+)
diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 3ddc65c63a49..82dc55707c4b 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -357,6 +357,7 @@ copy_mc_to_user(void __user *to, const void *from, unsigned long n)
return n;
}
+#define copy_mc_to_user copy_mc_to_user
#endif
extern long __copy_from_user_flushcache(void *dst, const void __user *src,
diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h
index 913e593a3b45..64ba7f723ddf 100644
--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -512,6 +512,7 @@ copy_mc_to_kernel(void *to, const void *from, unsigned len);
unsigned long __must_check
copy_mc_to_user(void *to, const void *from, unsigned len);
+#define copy_mc_to_user copy_mc_to_user
#endif
/*
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index 47e5d374c7eb..6f48ad43a82e 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -174,6 +174,15 @@ copy_mc_to_kernel(void *dst, const void *src, size_t cnt)
}
#endif
+#ifndef copy_mc_to_user
+static inline unsigned long __must_check
+copy_mc_to_user(void *dst, const void *src, size_t cnt)
+{
+ check_object_size(src, cnt, true);
+ return raw_copy_to_user(dst, src, cnt);
+}
+#endif
+
static __always_inline void pagefault_disabled_inc(void)
{
current->pagefault_disabled++;
--
2.25.1
next prev parent reply other threads:[~2022-08-12 7:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-12 7:05 [PATCH -next v7 0/4]arm64: add machine check safe support Tong Tiangen
2022-08-12 7:05 ` Tong Tiangen [this message]
2022-08-12 7:05 ` [PATCH -next v7 2/4] arm64: add support for machine check error safe Tong Tiangen
2022-08-12 7:05 ` [PATCH -next v7 3/4] arm64: add uaccess to machine check safe Tong Tiangen
2022-08-12 7:05 ` [PATCH -next v7 4/4] arm64: add cow " Tong Tiangen
2022-08-24 6:44 ` [PATCH -next v7 0/4]arm64: add machine check safe support Tong Tiangen
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