linux-kernel - [PATCH RFC v3 7/8] x86/xen: add __init for xen_pgd

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Message-Id: <20250429-noautoinline-v3-7-4c49f28ea5b5@uniontech.com>
Date: Tue, 29 Apr 2025 12:06:11 +0800
From: Chen Linxuan via B4 Relay <devnull+chenlinxuan.uniontech.com@...nel.org>
To: Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...nel.dk>, 
 Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>, 
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Cc: linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-mm@...ck.org, kvm@...r.kernel.org, virtualization@...ts.linux.dev, 
 linux-integrity@...r.kernel.org, linux-kbuild@...r.kernel.org, 
 llvm@...ts.linux.dev, Winston Wen <wentao@...ontech.com>, 
 kasan-dev@...glegroups.com, xen-devel@...ts.xenproject.org, 
 Chen Linxuan <chenlinxuan@...ontech.com>, 
 Changbin Du <changbin.du@...el.com>
Subject: [PATCH RFC v3 7/8] x86/xen: add __init for xen_pgd_walk

From: Chen Linxuan <chenlinxuan@...ontech.com>

Presume that kernel is compiled for x86_64 with gcc version 13.3.0:

  make allmodconfig
  make KCFLAGS="-fno-inline-small-functions -fno-inline-functions-called-once"

This results a modpost warning:

  WARNING: modpost: vmlinux: section mismatch in reference: xen_pgd_walk+0x42 (section: .text) -> xen_mark_pinned (section: .init.text)

As xen_pgd_walk is only referenced in xen_after_bootmem(void) which is
also in .init.text, I add __init for xen_pgd_walk to fix this issue.

Signed-off-by: Chen Linxuan <chenlinxuan@...ontech.com>
---
 arch/x86/xen/mmu_pv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
index 38971c6dcd4b78b6b14f51bc69c4bf6b70ebd622..53650888be0a7b1dba170a5b7ba9c654244b5125 100644
--- a/arch/x86/xen/mmu_pv.c
+++ b/arch/x86/xen/mmu_pv.c
@@ -696,7 +696,7 @@ static void __xen_pgd_walk(struct mm_struct *mm, pgd_t *pgd,
 	(*func)(mm, virt_to_page(pgd), PT_PGD);
 }

-static void xen_pgd_walk(struct mm_struct *mm,
+static void __init xen_pgd_walk(struct mm_struct *mm,
 			 void (*func)(struct mm_struct *mm, struct page *,
 				      enum pt_level),
 			 unsigned long limit)

-- 
2.43.0