[PATCH v2 4/5] kernel/resource: Introduce walk_system_ram_excluding_child_res()
From: Marc Zyngier <maz@kernel.org>
Date: 2021-05-31 09:58:51
Also in:
kexec, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
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@arm.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Marc Zyngier <maz@kernel.org> --- 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
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