From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx1.redhat.com ([209.132.183.28]) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VpxN8-0000Ln-Lr for kexec@lists.infradead.org; Mon, 09 Dec 2013 09:43:27 +0000 From: Dave Young Subject: [PATCH v5 01/14] x86/mm: sparse warning fix for early_memremap Date: Mon, 9 Dec 2013 17:42:14 +0800 Message-Id: <1386582147-9802-2-git-send-email-dyoung@redhat.com> In-Reply-To: <1386582147-9802-1-git-send-email-dyoung@redhat.com> References: <1386582147-9802-1-git-send-email-dyoung@redhat.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=twosheds.infradead.org@lists.infradead.org To: linux-kernel@vger.kernel.org Cc: mjg59@srcf.ucam.org, linux-efi@vger.kernel.org, toshi.kani@hp.com, matt@console-pimps.org, greg@kroah.com, x86@kernel.org, kexec@lists.infradead.org, James.Bottomley@HansenPartnership.com, horms@verge.net.au, bp@alien8.de, ebiederm@xmission.com, hpa@zytor.com, vgoyal@redhat.com There's a lot of sparse warnings for code like below: void *a = early_memremap(phys_addr, size); early_memremap intend to map kernel memory with ioremap facility, the return pointer should be a kernel ram pointer instead of iomem one. For making the function clearer and supressing sparse warnings this patch do below two things: 1. cast to (__force void *) for the return value of early_memremap 2. add early_memunmap function and pass (__force void __iomem *) to iounmap Signed-off-by: Dave Young --- arch/x86/include/asm/io.h | 3 ++- arch/x86/mm/ioremap.c | 10 +++++++--- 2 files changed, 9 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index 34f69cb..1db414f 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -325,9 +325,10 @@ extern void early_ioremap_init(void); extern void early_ioremap_reset(void); extern void __iomem *early_ioremap(resource_size_t phys_addr, unsigned long size); -extern void __iomem *early_memremap(resource_size_t phys_addr, +extern void *early_memremap(resource_size_t phys_addr, unsigned long size); extern void early_iounmap(void __iomem *addr, unsigned long size); +extern void early_memunmap(void *addr, unsigned long size); extern void fixup_early_ioremap(void); extern bool is_early_ioremap_ptep(pte_t *ptep); diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 799580c..bbb4504 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -562,10 +562,9 @@ early_ioremap(resource_size_t phys_addr, unsigned long size) } /* Remap memory */ -void __init __iomem * -early_memremap(resource_size_t phys_addr, unsigned long size) +void __init *early_memremap(resource_size_t phys_addr, unsigned long size) { - return __early_ioremap(phys_addr, size, PAGE_KERNEL); + return (__force void *)__early_ioremap(phys_addr, size, PAGE_KERNEL); } void __init early_iounmap(void __iomem *addr, unsigned long size) @@ -620,3 +619,8 @@ void __init early_iounmap(void __iomem *addr, unsigned long size) } prev_map[slot] = NULL; } + +void __init early_memunmap(void *addr, unsigned long size) +{ + early_iounmap((__force void __iomem *)addr, size); +} -- 1.8.3.1 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec