linux-kernel - [PATCH v7 12/16] arm: mm: define clear_user

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Message-Id: <20250917152418.4077386-13-ankur.a.arora@oracle.com>
Date: Wed, 17 Sep 2025 08:24:14 -0700
From: Ankur Arora <ankur.a.arora@...cle.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org
Cc: akpm@...ux-foundation.org, david@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, mingo@...hat.com,
        mjguzik@...il.com, luto@...nel.org, peterz@...radead.org,
        acme@...nel.org, namhyung@...nel.org, tglx@...utronix.de,
        willy@...radead.org, raghavendra.kt@....com,
        boris.ostrovsky@...cle.com, konrad.wilk@...cle.com,
        ankur.a.arora@...cle.com
Subject: [PATCH v7 12/16] arm: mm: define clear_user_highpages()

For configurations with CONFIG_MMU we do not define clear_user_page().
This runs into issues for configurations with !CONFIG_HIGHMEM, because
clear_user_highpages() expects to clear_user_page() (via a default
version of clear_user_pages()).

Define clear_user_highpages() so it can supercede the generic version.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202509030341.jBuh7Fma-lkp@intel.com/
Signed-off-by: Ankur Arora <ankur.a.arora@...cle.com>
---
 arch/arm/include/asm/page.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/include/asm/page.h b/arch/arm/include/asm/page.h
index ef11b721230e..ddcc8159b075 100644
--- a/arch/arm/include/asm/page.h
+++ b/arch/arm/include/asm/page.h
@@ -151,6 +151,13 @@ extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
 #define clear_user_highpage(page,vaddr)		\
 	 __cpu_clear_user_highpage(page, vaddr)
 
+#define clear_user_highpages(page, vaddr, npages)	\
+do {							\
+	clear_user_highpage(page, vaddr);		\
+	vaddr += PAGE_SIZE;				\
+	page++;						\
+} while (--npages)
+
 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
 #define copy_user_highpage(to,from,vaddr,vma)	\
 	__cpu_copy_user_highpage(to, from, vaddr, vma)
-- 
2.43.5