linux-kernel - [PATCH v2 3/8] x86/mm: Remove "static" from vmap_pages

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Message-Id: <20231121212016.1154303-4-mhklinux@outlook.com>
Date:   Tue, 21 Nov 2023 13:20:11 -0800
From:   mhkelley58@...il.com
To:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        kirill.shutemov@...ux.intel.com, kys@...rosoft.com,
        haiyangz@...rosoft.com, wei.liu@...nel.org, decui@...rosoft.com,
        luto@...nel.org, peterz@...radead.org, akpm@...ux-foundation.org,
        urezki@...il.com, hch@...radead.org, lstoakes@...il.com,
        thomas.lendacky@....com, ardb@...nel.org, jroedel@...e.de,
        seanjc@...gle.com, rick.p.edgecombe@...el.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-coco@...ts.linux.dev,
        linux-hyperv@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH v2 3/8] x86/mm: Remove "static" from vmap_pages_range()

From: Michael Kelley <mhklinux@...look.com>

The mm subsystem currently provides no mechanism to map memory pages
to a specified virtual address range.  A virtual address range can be
allocated using get_vm_area(), but the only function available for
mapping memory pages to a caller-specified address in that range is
ioremap_page_range(), which is inappropriate for system memory.

Fix this by allowing vmap_pages_range() to be used by callers outside
of vmalloc.c.

Signed-off-by: Michael Kelley <mhklinux@...look.com>
---
 include/linux/vmalloc.h | 2 ++
 mm/vmalloc.c            | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index c720be70c8dd..ee12f5226a45 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -233,6 +233,8 @@ static inline bool is_vm_area_hugepages(const void *addr)
 
 #ifdef CONFIG_MMU
 void vunmap_range(unsigned long addr, unsigned long end);
+int vmap_pages_range(unsigned long addr, unsigned long end, pgprot_t prot,
+			struct page **pages, unsigned int page_shift);
 static inline void set_vm_flush_reset_perms(void *addr)
 {
 	struct vm_struct *vm = find_vm_area(addr);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d12a17fc0c17..b2a72bd317c6 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -625,7 +625,7 @@ int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
  * RETURNS:
  * 0 on success, -errno on failure.
  */
-static int vmap_pages_range(unsigned long addr, unsigned long end,
+int vmap_pages_range(unsigned long addr, unsigned long end,
 		pgprot_t prot, struct page **pages, unsigned int page_shift)
 {
 	int err;
-- 
2.25.1