[PATCH v5 RESEND 14/17] mm/ioremap: Consider IOREMAP space in generic ioremap

Baoquan He
2023-05-15T09:14:19Z

From: Christophe Leroy <christophe.leroy@csgroup.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@csgroup.eu>
Signed-off-by: Baoquan He <bhe@redhat.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