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Subject[PATCH 10/28] mm: only allow page table mappings for built-in zsmalloc
Date
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
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