linux-kernel - Re: [PATCH v2 07/10] PPC, KVM, CMA: use general CMA reserved area management framework

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Date:	Sat, 14 Jun 2014 14:23:59 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>
Cc:	Minchan Kim <minchan@...nel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Gleb Natapov <gleb@...nel.org>, Alexander Graf <agraf@...e.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	kvm@...r.kernel.org, kvm-ppc@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v2 07/10] PPC, KVM, CMA: use general CMA reserved area management framework

Joonsoo Kim <iamjoonsoo.kim@....com> writes:

> Now, we have general CMA reserved area management framework,
> so use it for future maintainabilty. There is no functional change.
>
> Acked-by: Michal Nazarewicz <mina86@...a86.com>
> Acked-by: Paolo Bonzini <pbonzini@...hat.com>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Need this. We may want to keep the VM_BUG_ON by moving
KVM_CMA_CHUNK_ORDER around.

diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c
index 8056107..1932e0e 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
@@ -37,8 +37,6 @@
 #include <asm/ppc-opcode.h>
 #include <asm/cputable.h>
 
-#include "book3s_hv_cma.h"
-
 /* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */
 #define MAX_LPID_970   63
 
@@ -64,7 +62,6 @@ long kvmppc_alloc_hpt(struct kvm *kvm, u32 *htab_orderp)
        }
 
        kvm->arch.hpt_cma_alloc = 0;
-       VM_BUG_ON(order < KVM_CMA_CHUNK_ORDER);
        page = kvm_alloc_hpt(1 << (order - PAGE_SHIFT));
        if (page) {
                hpt = (unsigned long)pfn_to_kaddr(page_to_pfn(page));



-aneesh

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