linux-kernel - [PATCH -fixes] mm: Add a call to flush_cache_vmap() in vmap

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Message-Id: <20230809164633.1556126-1-alexghiti@rivosinc.com>
Date:   Wed,  9 Aug 2023 18:46:33 +0200
From:   Alexandre Ghiti <alexghiti@...osinc.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Uladzislau Rezki <urezki@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Lorenzo Stoakes <lstoakes@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Alexandre Ghiti <alexghiti@...osinc.com>,
        Dylan Jhong <dylan@...estech.com>
Subject: [PATCH -fixes] mm: Add a call to flush_cache_vmap() in vmap_pfn()

flush_cache_vmap() must be called after new vmalloc mappings are
installed in the page table in order to allow architectures to make sure
the new mapping is visible.

Fixes: 3e9a9e256b1e ("mm: add a vmap_pfn function")
Reported-by: Dylan Jhong <dylan@...estech.com>
Closes: https://lore.kernel.org/linux-riscv/ZMytNY2J8iyjbPPy@atctrx.andestech.com/
Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
---
 mm/vmalloc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 93cf99aba335..228a4a5312f2 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2979,6 +2979,10 @@ void *vmap_pfn(unsigned long *pfns, unsigned int count, pgprot_t prot)
 		free_vm_area(area);
 		return NULL;
 	}
+
+	flush_cache_vmap((unsigned long)area->addr,
+			 (unsigned long)area->addr + count * PAGE_SIZE);
+
 	return area->addr;
 }
 EXPORT_SYMBOL_GPL(vmap_pfn);
-- 
2.39.2