[PATCH 5.10 475/717] powerpc/32s: Fix cleanup_cpu_mmu_context() compile bug

Greg Kroah-Hartman
2020-12-28T14:49:03Z

From: Michael Ellerman <mpe@ellerman.id.au>

[ Upstream commit c1bea0a840ac75dca19bc6aa05575a33eb9fd058 ]

Currently pmac32_defconfig with SMP=y doesn't build:

arch/powerpc/platforms/powermac/smp.c:
error: implicit declaration of function 'cleanup_cpu_mmu_context'

It would be nice for consistency if all platforms clear mm_cpumask and
flush TLBs on unplug, but the TLB invalidation bug described in commit
01b0f0eae081 ("powerpc/64s: Trim offlined CPUs from mm_cpumasks") only
applies to 64s and for now we only have the TLB flush code for that
platform.

So just add an empty version for 32-bit Book3S.

Fixes: 01b0f0eae081 ("powerpc/64s: Trim offlined CPUs from mm_cpumasks")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Change log based on comments from Nick]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/powerpc/include/asm/book3s/32/mmu-hash.h | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/include/asm/book3s/32/mmu-hash.h b/arch/powerpc/include/asm/book3s/32/mmu-hash.h
index 2e277ca0170fb..a8982d52f6b1d 100644
--- a/arch/powerpc/include/asm/book3s/32/mmu-hash.h
+++ b/arch/powerpc/include/asm/book3s/32/mmu-hash.h
@@ -94,6 +94,7 @@ typedef struct {
} mm_context_t;

void update_bats(void);
+static inline void cleanup_cpu_mmu_context(void) { };

/* patch sites */
extern s32 patch__hash_page_A0, patch__hash_page_A1, patch__hash_page_A2;
--
2.27.0