linux-kernel - [PATCH v4 7/8] mm/vmalloc: add vmap_range

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Message-Id: <20200816090904.83947-8-npiggin@gmail.com>
Date:   Sun, 16 Aug 2020 19:09:03 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     linux-mm@...ck.org
Cc:     Nicholas Piggin <npiggin@...il.com>, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Zefan Li <lizefan@...wei.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH v4 7/8] mm/vmalloc: add vmap_range_noflush variant

As a side-effect, the order of flush_cache_vmap() and
arch_sync_kernel_mappings() calls are switched, but that now matches
the other callers in this file.

Signed-off-by: Nicholas Piggin <npiggin@...il.com>
---
 mm/vmalloc.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 129f10545bb1..4e5cb7c7f780 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -234,8 +234,8 @@ static int vmap_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end,
 	return 0;
 }
 
-int vmap_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot,
-			unsigned int max_page_shift)
+static int vmap_range_noflush(unsigned long addr, unsigned long end, phys_addr_t phys_addr,
+			pgprot_t prot, unsigned int max_page_shift)
 {
 	pgd_t *pgd;
 	unsigned long start;
@@ -255,14 +255,23 @@ int vmap_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgp
 			break;
 	} while (pgd++, phys_addr += (next - addr), addr = next, addr != end);
 
-	flush_cache_vmap(start, end);
-
 	if (mask & ARCH_PAGE_TABLE_SYNC_MASK)
 		arch_sync_kernel_mappings(start, end);
 
 	return err;
 }
 
+int vmap_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot,
+			unsigned int max_page_shift)
+{
+	int err;
+
+	err = vmap_range_noflush(addr, end, phys_addr, prot, max_page_shift);
+	flush_cache_vmap(addr, end);
+
+	return err;
+}
+
 static void vunmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
 			     pgtbl_mod_mask *mask)
 {
-- 
2.23.0