linux-kernel - [PATCH] x86: fix pti Section Mismatch warning/error

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Date:   Sat, 1 Sep 2018 21:01:28 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Andy Lutomirski <luto@...nel.org>
Cc:     kbuild test robot <lkp@...el.com>
Subject: [PATCH] x86: fix pti Section Mismatch warning/error

From: Randy Dunlap <rdunlap@...radead.org>

Fix the section mismatch warning in arch/x86/mm/pti.c:

WARNING: vmlinux.o(.text+0x6972a): Section mismatch in reference from the function pti_clone_pgtable() to the function .init.text:pti_user_pagetable_walk_pte()
The function pti_clone_pgtable() references
the function __init pti_user_pagetable_walk_pte().
This is often because pti_clone_pgtable lacks a __init
annotation or the annotation of pti_user_pagetable_walk_pte is wrong.
FATAL: modpost: Section mismatches detected.

Fixes: 85900ea51577 ("x86/pti: Map the vsyscall page if needed")

Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: x86@...nel.org
---
Applies to mainline.

 arch/x86/mm/pti.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20180830.orig/arch/x86/mm/pti.c
+++ linux-next-20180830/arch/x86/mm/pti.c
@@ -248,7 +248,7 @@ static pmd_t *pti_user_pagetable_walk_pm
  *
  * Returns a pointer to a PTE on success, or NULL on failure.
  */
-static __init pte_t *pti_user_pagetable_walk_pte(unsigned long address)
+static pte_t *pti_user_pagetable_walk_pte(unsigned long address)
 {
 	gfp_t gfp = (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO);
 	pmd_t *pmd;