linux-kernel - Re: [PATCH v6 3/3] ARM: mm: use static_vm for managing static mapped areas

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Date:	Sat, 16 Feb 2013 12:49:08 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Russell King <linux@....linux.org.uk>, js1304@...il.com,
	Nicolas Pitre <nico@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH v6 3/3] ARM: mm: use static_vm for managing static mapped areas

On Wednesday 06 February 2013, Joonsoo Kim wrote:
> @@ -859,17 +864,12 @@ static void __init pci_reserve_io(void)
>  {
>  	struct vm_struct *vm;
>  	unsigned long addr;
> +	struct static_vm *svm;
>  
> -	/* we're still single threaded hence no lock needed here */
> -	for (vm = vmlist; vm; vm = vm->next) {
> -		if (!(vm->flags & VM_ARM_STATIC_MAPPING))
> -			continue;
> -		addr = (unsigned long)vm->addr;
> -		addr &= ~(SZ_2M - 1);
> -		if (addr == PCI_IO_VIRT_BASE)
> -			return;
> +	svm = find_static_vm_vaddr((void *)PCI_IO_VIRT_BASE);
> +	if (svm)
> +		return;
>  
> -	}

This is causing build warnings in a bunch of configurations now,
see patch below.

	Arnd

8<-----
ARM: mm: remove unused variables in pci_reserve_io

Patch "ARM: 7646/1: mm: use static_vm for managing static mapped areas"
removed code from pci_reserve_io but left variable declarations
in place that are now unused, as gcc correctly warns.

Signed-off-by: Arnd Bergmann <arnd@...db.de>

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index c6fe15a..c6d45c8 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -901,8 +901,6 @@ static void __init fill_pmd_gaps(void)
 #if defined(CONFIG_PCI) && !defined(CONFIG_NEED_MACH_IO_H)
 static void __init pci_reserve_io(void)
 {
-	struct vm_struct *vm;
-	unsigned long addr;
 	struct static_vm *svm;
 
 	svm = find_static_vm_vaddr((void *)PCI_IO_VIRT_BASE);
--
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