linux-kernel - [PATCH] powerpc/64e: Rewrite p4d_populate() as a static inline function

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Date:   Thu, 23 Jun 2022 10:56:57 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Mike Rapoport <rppt@...nel.org>
Subject: [PATCH] powerpc/64e: Rewrite p4d_populate() as a static inline function

Rewrite p4d_populate() as a static inline function instead of
a macro.

This change allows typechecking and would have helped detecting
a recently found bug in map_kernel_page().

Cc: Mike Rapoport <rppt@...nel.org>
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/include/asm/nohash/64/pgalloc.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/nohash/64/pgalloc.h b/arch/powerpc/include/asm/nohash/64/pgalloc.h
index 668aee6017e7..e50b211becb3 100644
--- a/arch/powerpc/include/asm/nohash/64/pgalloc.h
+++ b/arch/powerpc/include/asm/nohash/64/pgalloc.h
@@ -15,7 +15,10 @@ struct vmemmap_backing {
 };
 extern struct vmemmap_backing *vmemmap_list;
 
-#define p4d_populate(MM, P4D, PUD)	p4d_set(P4D, (unsigned long)PUD)
+static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
+{
+	p4d_set(p4d, (unsigned long)pud);
+}
 
 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
 {
-- 
2.36.1