linux-kernel - [PATCH v10 1/6] uaccess: add generic fallback version of copy_mc_to

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Date: Mon, 29 Jan 2024 21:46:47 +0800
From: Tong Tiangen <tongtiangen@...wei.com>
To: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>, James Morse <james.morse@....com>, Robin
 Murphy <robin.murphy@....com>, Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Alexander Potapenko <glider@...gle.com>, Alexander Viro
	<viro@...iv.linux.org.uk>, Andrey Konovalov <andreyknvl@...il.com>, Dmitry
 Vyukov <dvyukov@...gle.com>, Vincenzo Frascino <vincenzo.frascino@....com>,
	Andrew Morton <akpm@...ux-foundation.org>, Michael Ellerman
	<mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.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>
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 v10 1/6] 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>
---
 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 f1f9890f50d3..4bfd1e6f0702 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -381,6 +381,7 @@ 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 5c367c1290c3..fd56282ee9a8 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 3064314f4832..550287c92990 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -205,6 +205,15 @@ 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