linux-kernel - [PATCH v13 1/5] uaccess: add generic fallback version of copy_mc_to

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Message-ID: <20241209024257.3618492-2-tongtiangen@huawei.com>
Date: Mon, 9 Dec 2024 10:42:53 +0800
From: Tong Tiangen <tongtiangen@...wei.com>
To: Mark Rutland <mark.rutland@....com>, Jonathan Cameron
	<Jonathan.Cameron@...wei.com>, Mauro Carvalho Chehab
	<mchehab+huawei@...nel.org>, Catalin Marinas <catalin.marinas@....com>, Will
 Deacon <will@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, James
 Morse <james.morse@....com>, Robin Murphy <robin.murphy@....com>, Andrey
 Konovalov <andreyknvl@...il.com>, Dmitry Vyukov <dvyukov@...gle.com>,
	Vincenzo Frascino <vincenzo.frascino@....com>, Michael Ellerman
	<mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, Andrey Ryabinin
	<ryabinin.a.a@...il.com>, Alexander Potapenko <glider@...gle.com>, Christophe
 Leroy <christophe.leroy@...roup.eu>, Aneesh Kumar K.V
	<aneesh.kumar@...nel.org>, "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
	<x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Madhavan Srinivasan
	<maddy@...ux.ibm.com>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-mm@...ck.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	<kasan-dev@...glegroups.com>, Tong Tiangen <tongtiangen@...wei.com>,
	<wangkefeng.wang@...wei.com>, Guohanjun <guohanjun@...wei.com>
Subject: [PATCH v13 1/5] uaccess: add generic fallback version of copy_mc_to_user()

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@...wei.com>
Acked-by: Michael Ellerman <mpe@...erman.id.au>
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 arch/powerpc/include/asm/uaccess.h | 1 +
 arch/x86/include/asm/uaccess.h     | 1 +
 include/linux/uaccess.h            | 8 ++++++++
 3 files changed, 10 insertions(+)

diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 4f5a46a77fa2..44476d66ed13 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -403,6 +403,7 @@ 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 3a7755c1a441..3db67f44063b 100644
--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -497,6 +497,7 @@ copy_mc_to_kernel(void *to, const void *from, unsigned len);
 
 unsigned long __must_check
 copy_mc_to_user(void __user *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 e9c702c1908d..9d8c9f8082ff 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -239,6 +239,14 @@ 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)
+{
+	return copy_to_user(dst, src, cnt);
+}
+#endif
+
 static __always_inline void pagefault_disabled_inc(void)
 {
 	current->pagefault_disabled++;
-- 
2.25.1