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Subject[PATCH] riscv: fix the global name pfn_base confliction error
Date
From: Kenneth Lee <liguozhu@hisilicon.com>

RISCV use a global variable pfn_base for page/pfn translation. But this
is a common name and will be used elsewhere. In those case,
the page-pfn macro which refer this name will refer to the local/input
variable of those function (such as in vfio_pin_pages_remote). This make
everything wrong.

This patch change the name from pfn_base to riscv_global_pfn_base to fix
this problem

Signed-off-by: Kenneth Lee <liguozhu@hisilicon.com>
---
arch/riscv/include/asm/page.h | 4 ++--
arch/riscv/mm/init.c | 6 +++---
2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
index cca8764aed83..8711e415f37c 100644
--- a/arch/riscv/include/asm/page.h
+++ b/arch/riscv/include/asm/page.h
@@ -79,8 +79,8 @@ typedef struct page *pgtable_t;
#endif

#ifdef CONFIG_MMU
-extern unsigned long pfn_base;
-#define ARCH_PFN_OFFSET (pfn_base)
+extern unsigned long riscv_global_pfn_base;
+#define ARCH_PFN_OFFSET (riscv_global_pfn_base)
#else
#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
#endif /* CONFIG_MMU */
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index a14bf3910eec..2ce4e9a46ca0 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -228,8 +228,8 @@ static struct pt_alloc_ops _pt_ops __initdata;
#define pt_ops _pt_ops
#endif

-unsigned long pfn_base __ro_after_init;
-EXPORT_SYMBOL(pfn_base);
+unsigned long riscv_global_pfn_base __ro_after_init;
+EXPORT_SYMBOL(riscv_global_pfn_base);

pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
@@ -572,7 +572,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
#endif

- pfn_base = PFN_DOWN(kernel_map.phys_addr);
+ riscv_global_pfn_base = PFN_DOWN(kernel_map.phys_addr);

/*
* Enforce boot alignment requirements of RV32 and
--
2.25.1
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