Introduce a new helper called walk_system_ram_excluding_child_res(),
which does the same job as walk_system_ram_res() but excludes
overlapping child resources.
Again, nobody is interested in such a filtering, so no functional
change is expected.
Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Reviewed-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
include/linux/ioport.h | 3 +++
kernel/resource.c | 15 +++++++++++++++
2 files changed, 18 insertions(+)
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 8359c50f9988..f9638d085349 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -320,6 +320,9 @@ extern int
walk_system_ram_res(u64 start, u64 end, void *arg,
int (*func)(struct resource *, void *));
extern int
+walk_system_ram_excluding_child_res(u64 start, u64 end, void *arg,
+ int (*func)(struct resource *, void *));
+extern int
walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end,
void *arg, int (*func)(struct resource *, void *));
diff --git a/kernel/resource.c b/kernel/resource.c
index 0e4d2ca763cd..92b765eaba58 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -492,6 +492,21 @@ int walk_system_ram_res(u64 start, u64 end, void *arg,
false, arg, func);
}
+/*
+ * This function calls the @func callback against all memory ranges of type
+ * System RAM which are marked as IORESOURCE_SYSTEM_RAM and IORESOUCE_BUSY,
+ * excluding RAM ranges that have overlapping child resources.
+ * Same constraints as @walk_system_ram_res apply.
+ */
+int walk_system_ram_excluding_child_res(u64 start, u64 end, void *arg,
+ int (*func)(struct resource *, void *))
+{
+ unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+ return __walk_iomem_res_desc(start, end, flags, IORES_DESC_NONE,
+ true, arg, func);
+}
+
/*
* This function calls the @func callback against all memory ranges, which
* are ranges marked as IORESOURCE_MEM and IORESOUCE_BUSY.
--
2.30.2
_______________________________________________
kexec mailing list
kexec@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/kexec
