linux-kernel - [PATCH AUTOSEL 5.4 4/7] powerpc: pmd_move_must_withdraw() is only needed for CONFIG_TRANSPARENT

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Message-ID: <20240115232905.210324-4-sashal@kernel.org>
Date: Mon, 15 Jan 2024 18:28:49 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Stephen Rothwell <sfr@...b.auug.org.au>,
	Michael Ellerman <mpe@...erman.id.au>,
	Sasha Levin <sashal@...nel.org>,
	akpm@...ux-foundation.org,
	vishal.moola@...il.com,
	aneesh.kumar@...ux.ibm.com,
	christophe.leroy@...roup.eu,
	arnd@...db.de,
	linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH AUTOSEL 5.4 4/7] powerpc: pmd_move_must_withdraw() is only needed for CONFIG_TRANSPARENT_HUGEPAGE

From: Stephen Rothwell <sfr@...b.auug.org.au>

[ Upstream commit 0d555b57ee660d8a871781c0eebf006e855e918d ]

The linux-next build of powerpc64 allnoconfig fails with:

  arch/powerpc/mm/book3s64/pgtable.c:557:5: error: no previous prototype for 'pmd_move_must_withdraw'
    557 | int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl,
        |     ^~~~~~~~~~~~~~~~~~~~~~

Caused by commit:

  c6345dfa6e3e ("Makefile.extrawarn: turn on missing-prototypes globally")

Fix it by moving the function definition under
CONFIG_TRANSPARENT_HUGEPAGE like the prototype. The function is only
called when CONFIG_TRANSPARENT_HUGEPAGE=y.

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
[mpe: Flesh out change log from linux-next patch]
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://msgid.link/20231127132809.45c2b398@canb.auug.org.au
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/powerpc/mm/book3s64/pgtable.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c
index 2bf7e1b4fd82..c4890f4b0b6c 100644
--- a/arch/powerpc/mm/book3s64/pgtable.c
+++ b/arch/powerpc/mm/book3s64/pgtable.c
@@ -442,6 +442,7 @@ void ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr,
 	set_pte_at(vma->vm_mm, addr, ptep, pte);
 }
 
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 /*
  * For hash translation mode, we use the deposited table to store hash slot
  * information and they are stored at PTRS_PER_PMD offset from related pmd
@@ -463,6 +464,7 @@ int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl,
 
 	return true;
 }
+#endif
 
 /*
  * Does the CPU support tlbie?
-- 
2.43.0