[PATCH] powerpc/64s: Fix build failure when CONFIG_PPC_64S_HASH_MMU is not set

[Murilo Opsfelder Araujo]

The following build failure occurs when CONFIG_PPC_64S_HASH_MMU is not set:

    arch/powerpc/kernel/setup_64.c: In function ‘setup_per_cpu_areas’:
    arch/powerpc/kernel/setup_64.c:811:21: error: ‘mmu_linear_psize’ undeclared (first use in this function); did you mean ‘mmu_virtual_psize’?
      811 |                 if (mmu_linear_psize == MMU_PAGE_4K)
          |                     ^~~~~~~~~~~~~~~~
          |                     mmu_virtual_psize
    arch/powerpc/kernel/setup_64.c:811:21: note: each undeclared identifier is reported only once for each function it appears in

Move the declaration of mmu_linear_psize outside of CONFIG_PPC_64S_HASH_MMU
ifdef.

Fixes: 387e220a2e5e (powerpc/64s: Move hash MMU support code under CONFIG_PPC_64S_HASH_MMU)
Reported-by: Erhard F. <erhard_f at mailbox.org>
Signed-off-by: Murilo Opsfelder Araujo <muriloo at linux.ibm.com>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Cc: Paul Mackerras <paulus at samba.org>
Cc: Nicholas Piggin <npiggin at gmail.com>
Cc: Fabiano Rosas <farosas at linux.ibm.com>
Cc: Nick Child <nick.child at ibm.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215567
---
 arch/powerpc/include/asm/book3s/64/mmu.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/book3s/64/mmu.h b/arch/powerpc/include/asm/book3s/64/mmu.h
index ba5b1becf518..006cbec70ffe 100644
--- a/arch/powerpc/include/asm/book3s/64/mmu.h
+++ b/arch/powerpc/include/asm/book3s/64/mmu.h
@@ -202,7 +202,6 @@ static inline struct subpage_prot_table *mm_ctx_subpage_prot(mm_context_t *ctx)
 /*
  * The current system page and segment sizes
  */
-extern int mmu_linear_psize;
 extern int mmu_virtual_psize;
 extern int mmu_vmalloc_psize;
 extern int mmu_io_psize;
@@ -213,6 +212,7 @@ extern int mmu_io_psize;
 #define mmu_virtual_psize MMU_PAGE_4K
 #endif
 #endif
+extern int mmu_linear_psize;
 extern int mmu_vmemmap_psize;
 
 /* MMU initialization */
-- 
2.35.1