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

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Date:   Wed, 16 Jun 2021 23:07:44 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.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 akpm tree

Hi all,

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

In file included from arch/sparc/include/asm/pgtable.h:7:0,
                 from include/linux/pgtable.h:6,
                 from include/linux/mm.h:33,
                 from include/linux/ring_buffer.h:5,
                 from include/linux/trace_events.h:6,
                 from include/trace/syscall.h:7,
                 from include/linux/syscalls.h:87,
                 from fs/io_uring.c:45:
arch/sparc/include/asm/pgtable_32.h: In function 'pud_pgtable':
arch/sparc/include/asm/pgtable_32.h:157:10: warning: return makes pointer from integer without a cast [-Wint-conversion]
   return ~0;
          ^

and many, many more like this.

This is an error due to (part of) the tree being built with -Werror

Caused by commit

  8aef6710db27 ("mm: rename pud_page_vaddr to pud_pgtable and make it return pmd_t *")

I have applied the following hack fix for today.

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Wed, 16 Jun 2021 22:51:50 +1000
Subject: [PATCH] mm: rename pud_page_vaddr to pud_pgtable and make it return pmd_t * fix

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 arch/sparc/include/asm/pgtable_32.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h
index 1e6b55425f3d..ffccfe3b22ed 100644
--- a/arch/sparc/include/asm/pgtable_32.h
+++ b/arch/sparc/include/asm/pgtable_32.h
@@ -154,7 +154,7 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 static inline pmd_t *pud_pgtable(pud_t pud)
 {
 	if (srmmu_device_memory(pud_val(pud))) {
-		return ~0;
+		return (pmd_t *)~0;
 	} else {
 		unsigned long v = pud_val(pud) & SRMMU_PTD_PMASK;
 		return (pmd_t *)__nocache_va(v << 4);
-- 
2.30.2

-- 
Cheers,
Stephen Rothwell

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