linux-kernel - [RFC PATCH 7/8] mm/ioremap: Consider IOREMAP space in generic ioremap

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Date:   Wed, 12 Oct 2022 12:09:43 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Baoquan He <bhe@...hat.com>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        akpm@...ux-foundation.org, hch@...radead.org,
        agordeev@...ux.ibm.com, wangkefeng.wang@...wei.com,
        schnelle@...ux.ibm.com, David.Laight@...LAB.COM, shorne@...il.com
Subject: [RFC PATCH 7/8] mm/ioremap: Consider IOREMAP space in generic ioremap

Some architecture have a dedicated space for IOREMAP mappings.

If so, use it in generic_ioremap_pro().

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

diff --git a/mm/ioremap.c b/mm/ioremap.c
index 9f34a8f90b58..a2be9cda975b 100644
--- a/mm/ioremap.c
+++ b/mm/ioremap.c
@@ -31,8 +31,13 @@ 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;
@@ -62,7 +67,7 @@ void generic_iounmap(volatile void __iomem *addr)
 	if (!iounmap_allowed(vaddr))
 		return;
 
-	if (is_vmalloc_addr(vaddr))
+	if (is_ioremap_addr(vaddr))
 		vunmap(vaddr);
 }
 
-- 
2.37.1