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From:   Christoph Hellwig <hch@lst.de>
To:     Andrew Morton <akpm@linux-foundation.org>,
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        Haiyang Zhang <haiyangz@microsoft.com>,
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Subject: [PATCH 10/28] mm: only allow page table mappings for built-in zsmalloc
Date:   Wed,  8 Apr 2020 13:59:08 +0200
Message-Id: <20200408115926.1467567-11-hch@lst.de>
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This allows to unexport map_vm_area and unmap_kernel_range, which are
rather deep internal and should not be available to modules.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 mm/Kconfig   | 2 +-
 mm/vmalloc.c | 2 --
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index 36949a9425b8..614cc786b519 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -702,7 +702,7 @@ config ZSMALLOC
 
 config ZSMALLOC_PGTABLE_MAPPING
 	bool "Use page table mapping to access object in zsmalloc"
-	depends on ZSMALLOC
+	depends on ZSMALLOC=y
 	help
 	  By default, zsmalloc uses a copy-based object mapping method to
 	  access allocations that span two pages. However, if a particular
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 3375f9508ef6..9183fc0d365a 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2046,7 +2046,6 @@ void unmap_kernel_range(unsigned long addr, unsigned long size)
 	vunmap_page_range(addr, end);
 	flush_tlb_kernel_range(addr, end);
 }
-EXPORT_SYMBOL_GPL(unmap_kernel_range);
 
 int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page **pages)
 {
@@ -2058,7 +2057,6 @@ int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page **pages)
 
 	return err > 0 ? 0 : err;
 }
-EXPORT_SYMBOL_GPL(map_vm_area);
 
 static inline void setup_vmalloc_vm_locked(struct vm_struct *vm,
 	struct vmap_area *va, unsigned long flags, const void *caller)
-- 
2.25.1