linux-kernel - [tip:x86/boot] x86/mm: Mark p4d_offset() __always

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Date:   Sat, 19 May 2018 04:35:40 -0700
From:   "tip-bot for Kirill A. Shutemov" <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, torvalds@...ux-foundation.org,
        linux-kernel@...r.kernel.org, hughd@...gle.com, hpa@...or.com,
        peterz@...radead.org, tglx@...utronix.de,
        kirill.shutemov@...ux.intel.com
Subject: [tip:x86/boot] x86/mm: Mark p4d_offset() __always_inline

Commit-ID:  1ea66554d3b09ce09c42e6a871899c84a276bb39
Gitweb:     https://git.kernel.org/tip/1ea66554d3b09ce09c42e6a871899c84a276bb39
Author:     Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
AuthorDate: Fri, 18 May 2018 13:35:27 +0300
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sat, 19 May 2018 11:56:57 +0200

x86/mm: Mark p4d_offset() __always_inline

__pgtable_l5_enabled shouldn't be needed after system has booted, we can
mark it as __initdata, but it requires preparation.

KASAN initialization code is a user of USE_EARLY_PGTABLE_L5, so all
pgtable_l5_enabled() translated to __pgtable_l5_enabled there, including
the one in p4d_offset().

It may lead to section mismatch, if a compiler would not inline
p4d_offset(), but leave it as a standalone function: p4d_offset() is not
marked as __init.

Marking p4d_offset() as __always_inline fixes the issue.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20180518103528.59260-7-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/pgtable.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 5715647fc4fe..99ecde23c3ec 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -898,7 +898,7 @@ static inline unsigned long pgd_page_vaddr(pgd_t pgd)
 #define pgd_page(pgd)	pfn_to_page(pgd_pfn(pgd))
 
 /* to find an entry in a page-table-directory. */
-static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
+static __always_inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
 {
 	if (!pgtable_l5_enabled())
 		return (p4d_t *)pgd;