linux-kernel - linux-next: build failure after merge of the mm tree

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Date:   Wed, 11 May 2022 18:15:31 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: linux-next: build failure after merge of the mm tree

Hi all,

After merging the mm tree, today's linux-next build (sparc64 defconfig)
failed like this:

In file included from include/linux/hugetlb.h:757,
                 from arch/sparc/mm/hugetlbpage.c:11:
arch/sparc/include/asm/hugetlb.h: In function 'huge_ptep_clear_flush':
arch/sparc/include/asm/hugetlb.h:27:1: error: no return statement in function returning non-void [-Werror=return-type]
   27 | }
      | ^

(and many more)

Caused by commit

  083af99303b9 ("mm: change huge_ptep_clear_flush() to return the original pte")

I applied the following hack to make it build.

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Wed, 11 May 2022 18:10:56 +1000
Subject: [PATCH] fix up for "mm: change huge_ptep_clear_flush() to return the original pte"

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 arch/sparc/include/asm/hugetlb.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/sparc/include/asm/hugetlb.h b/arch/sparc/include/asm/hugetlb.h
index b50aa6f8f9ab..0a26cca24232 100644
--- a/arch/sparc/include/asm/hugetlb.h
+++ b/arch/sparc/include/asm/hugetlb.h
@@ -24,6 +24,7 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
 static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
 					  unsigned long addr, pte_t *ptep)
 {
+	return *ptep;
 }
 
 #define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
-- 
2.35.1

-- 
Cheers,
Stephen Rothwell

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