Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.33 as permitted sender) client-ip=23.128.96.33;
From:   mhkelley58@gmail.com
To:     tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
        dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com,
        kirill.shutemov@linux.intel.com, kys@microsoft.com,
        haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com,
        luto@kernel.org, peterz@infradead.org, akpm@linux-foundation.org,
        urezki@gmail.com, hch@infradead.org, lstoakes@gmail.com,
        thomas.lendacky@amd.com, ardb@kernel.org, jroedel@suse.de,
        seanjc@google.com, rick.p.edgecombe@intel.com,
        sathyanarayanan.kuppuswamy@linux.intel.com,
        linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev,
        linux-hyperv@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH v2 3/8] x86/mm: Remove "static" from vmap_pages_range()
Date:   Tue, 21 Nov 2023 13:20:11 -0800
Message-Id: <20231121212016.1154303-4-mhklinux@outlook.com>
In-Reply-To: <20231121212016.1154303-1-mhklinux@outlook.com>
References: <20231121212016.1154303-1-mhklinux@outlook.com>
Reply-To: mhklinux@outlook.com
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Michael Kelley <mhklinux@outlook.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@outlook.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