linux-kernel - [PATCH 1/3] x86, uaccess: Remove memcpy_page

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Message-Id: <20221230-kmap-x86-v1-1-15f1ecccab50@intel.com>
Date:   Wed, 15 Mar 2023 16:20:54 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org,
        Ira Weiny <ira.weiny@...el.com>
Subject: [PATCH 1/3] x86, uaccess: Remove memcpy_page_flushcache()

Commit 21b56c847753 ("iov_iter: get rid of separate bvec and xarray
callbacks") removed the calls to memcpy_page_flushcache().

kmap_atomic() is deprecated and used in memcpy_page_flushcache().

Remove the unnecessary memcpy_page_flushcache() call.

Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: "Dan Williams" <dan.j.williams@...el.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: x86@...nel.org
Cc: "H. Peter Anvin" <hpa@...or.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 arch/x86/include/asm/uaccess_64.h | 2 --
 arch/x86/lib/usercopy_64.c        | 9 ---------
 2 files changed, 11 deletions(-)

diff --git a/arch/x86/include/asm/uaccess_64.h b/arch/x86/include/asm/uaccess_64.h
index d13d71af5cf6..c6b1dcded364 100644
--- a/arch/x86/include/asm/uaccess_64.h
+++ b/arch/x86/include/asm/uaccess_64.h
@@ -62,8 +62,6 @@ extern long __copy_user_nocache(void *dst, const void __user *src,
 				unsigned size, int zerorest);
 
 extern long __copy_user_flushcache(void *dst, const void __user *src, unsigned size);
-extern void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
-			   size_t len);
 
 static inline int
 __copy_from_user_inatomic_nocache(void *dst, const void __user *src,
diff --git a/arch/x86/lib/usercopy_64.c b/arch/x86/lib/usercopy_64.c
index 6c1f8ac5e721..f515542f017f 100644
--- a/arch/x86/lib/usercopy_64.c
+++ b/arch/x86/lib/usercopy_64.c
@@ -136,13 +136,4 @@ void __memcpy_flushcache(void *_dst, const void *_src, size_t size)
 	}
 }
 EXPORT_SYMBOL_GPL(__memcpy_flushcache);
-
-void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
-		size_t len)
-{
-	char *from = kmap_atomic(page);
-
-	memcpy_flushcache(to, from + offset, len);
-	kunmap_atomic(from);
-}
 #endif

-- 
2.39.2