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

From: Stephen Rothwell <[email-masked]>
Date: Thu, 10 Mar 2022 19:58:02 +1100

Hi all,

After merging the akpm-current tree, today's linux-next build (arm64
defconfig) failed like this:

mm/mmap.c: In function 'vm_get_page_prot':
mm/mmap.c:122:16: error: implicit declaration of function 'arch_filter_pgprot' [-Werror=implicit-function-declaration]
  122 |         return arch_filter_pgprot(ret);
      |                ^~~~~~~~~~~~~~~~~~
mm/mmap.c:122:16: error: incompatible types when returning type 'int' but 'pgprot_t' was expected
  122 |         return arch_filter_pgprot(ret);
      |                ^~~~~~~~~~~~~~~~~~~~~~~
mm/mmap.c:123:1: error: control reaches end of non-void function [-Werror=return-type]
  123 | }
      | ^

Caused by commit

  e25ff72a53b9 ("mm: generalize ARCH_HAS_FILTER_PGPROT")

interacting with commit

  6e2edd6371a4 ("arm64: Ensure execute-only permissions are not allowed without EPAN")

from Linus' tree (today).

I have applied the following merg fix patch for today.

From: Stephen Rothwell <[email-masked]>
Date: Thu, 10 Mar 2022 19:50:30 +1100
Subject: [PATCH] fixup for "mm: generalize ARCH_HAS_FILTER_PGPROT"

Semantic conflict with commit

  6e2edd6371a4 ("arm64: Ensure execute-only permissions are not allowed without EPAN")

Signed-off-by: Stephen Rothwell <[email-masked]>
---
 arch/arm64/Kconfig | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 0b8f9328cd95..962c84952c98 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -25,7 +25,6 @@ config ARM64
 	select ARCH_HAS_DMA_PREP_COHERENT
 	select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
 	select ARCH_HAS_FAST_MULTIPLIER
-	select ARCH_HAS_FILTER_PGPROT
 	select ARCH_HAS_FORTIFY_SOURCE
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_GIGANTIC_PAGE
-- 
2.34.1

-- 
Cheers,
Stephen Rothwell