linux-kernel - [PATCH v4 13/16] mm/ioremap: Consider IOREMAP space in generic ioremap

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Date:   Thu, 16 Feb 2023 20:34:16 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org,
        christophe.leroy@...roup.eu, hch@...radead.org,
        agordeev@...ux.ibm.com, wangkefeng.wang@...wei.com,
        schnelle@...ux.ibm.com, David.Laight@...LAB.COM, shorne@...il.com,
        arnd@...db.de, Baoquan He <bhe@...hat.com>
Subject: [PATCH v4 13/16] mm/ioremap: Consider IOREMAP space in generic ioremap

From: Christophe Leroy <christophe.leroy@...roup.eu>

Architectures like powerpc have a dedicated space for IOREMAP mappings.

If so, use it in generic_ioremap_pro().

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
Signed-off-by: Baoquan He <bhe@...hat.com>
---
 mm/ioremap.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/mm/ioremap.c b/mm/ioremap.c
index 2fbe6b9bc50e..4a7749d85044 100644
--- a/mm/ioremap.c
+++ b/mm/ioremap.c
@@ -35,8 +35,13 @@ void __iomem *generic_ioremap_prot(phys_addr_t phys_addr, size_t size,
 	if (!ioremap_allowed(phys_addr, size, pgprot_val(prot)))
 		return NULL;
 
+#ifdef IOREMAP_START
+	area = __get_vm_area_caller(size, VM_IOREMAP, IOREMAP_START,
+				    IOREMAP_END, __builtin_return_address(0));
+#else
 	area = get_vm_area_caller(size, VM_IOREMAP,
 			__builtin_return_address(0));
+#endif
 	if (!area)
 		return NULL;
 	vaddr = (unsigned long)area->addr;
@@ -66,7 +71,7 @@ void generic_iounmap(volatile void __iomem *addr)
 	if (!iounmap_allowed(vaddr))
 		return;
 
-	if (is_vmalloc_addr(vaddr))
+	if (is_ioremap_addr(vaddr))
 		vunmap(vaddr);
 }
 
-- 
2.34.1