From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: From: Marc Zyngier Subject: [PATCH v2 4/5] kernel/resource: Introduce walk_system_ram_excluding_child_res() Date: Mon, 31 May 2021 10:57:19 +0100 Message-Id: <20210531095720.77469-5-maz@kernel.org> In-Reply-To: <20210531095720.77469-1-maz@kernel.org> References: <20210531095720.77469-1-maz@kernel.org> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Catalin Marinas , Will Deacon , Ard Biesheuvel , Mark Rutland , James Morse , Lorenzo Pieralisi , Hanjun Guo , Sudeep Holla , Eric Biederman , Bhupesh SHARMA , AKASHI Takahiro , Dave Young , Andrew Morton , Moritz Fischer , kernel-team@android.com 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 Reviewed-by: Ard Biesheuvel Signed-off-by: Marc Zyngier --- 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@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec