linux-kernel - [PATCH] powerpc/47x: Remove early_init_mmu

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Message-ID: <17e245625f44be5cef3e7a358ae6b1e09ca05bc6.1692281067.git.christophe.leroy@csgroup.eu>
Date:   Thu, 17 Aug 2023 16:13:40 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH] powerpc/47x: Remove early_init_mmu_47x() to fix no previous prototype

4xx/iss476-smp_defconfig leads to:

  CC      arch/powerpc/mm/nohash/tlb.o
arch/powerpc/mm/nohash/tlb.c:322:13: error: no previous prototype for 'early_init_mmu_47x' [-Werror=missing-prototypes]
  322 | void __init early_init_mmu_47x(void)
      |             ^~~~~~~~~~~~~~~~~~

early_init_mmu_47x() is used only at one place and only locally.

Fold it into its only caller and remove it.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Arnd Bergmann <arnd@...db.de>
---
 arch/powerpc/mm/mmu_decl.h   |  1 +
 arch/powerpc/mm/nohash/tlb.c | 19 +++++--------------
 2 files changed, 6 insertions(+), 14 deletions(-)

diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index c6dccb4f06dc..7f9ff0640124 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -110,6 +110,7 @@ extern void MMU_init_hw(void);
 void MMU_init_hw_patch(void);
 unsigned long mmu_mapin_ram(unsigned long base, unsigned long top);
 #endif
+void mmu_init_secondary(int cpu);
 
 #ifdef CONFIG_PPC_E500
 extern unsigned long map_mem_in_cams(unsigned long ram, int max_cam_idx,
diff --git a/arch/powerpc/mm/nohash/tlb.c b/arch/powerpc/mm/nohash/tlb.c
index a903b308acc5..5ffa0af4328a 100644
--- a/arch/powerpc/mm/nohash/tlb.c
+++ b/arch/powerpc/mm/nohash/tlb.c
@@ -318,17 +318,6 @@ EXPORT_SYMBOL(flush_tlb_page);
 
 #endif /* CONFIG_SMP */
 
-#ifdef CONFIG_PPC_47x
-void __init early_init_mmu_47x(void)
-{
-#ifdef CONFIG_SMP
-	unsigned long root = of_get_flat_dt_root();
-	if (of_get_flat_dt_prop(root, "cooperative-partition", NULL))
-		mmu_clear_feature(MMU_FTR_USE_TLBIVAX_BCAST);
-#endif /* CONFIG_SMP */
-}
-#endif /* CONFIG_PPC_47x */
-
 /*
  * Flush kernel TLB entries in the given range
  */
@@ -746,8 +735,10 @@ void setup_initial_memory_limit(phys_addr_t first_memblock_base,
 #else /* ! CONFIG_PPC64 */
 void __init early_init_mmu(void)
 {
-#ifdef CONFIG_PPC_47x
-	early_init_mmu_47x();
-#endif
+	unsigned long root = of_get_flat_dt_root();
+
+	if (IS_ENABLED(CONFIG_PPC_47x) && IS_ENABLED(CONFIG_SMP) &&
+	    of_get_flat_dt_prop(root, "cooperative-partition", NULL))
+		mmu_clear_feature(MMU_FTR_USE_TLBIVAX_BCAST);
 }
 #endif /* CONFIG_PPC64 */
-- 
2.41.0