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Date: Thu, 30 May 2019 11:48:26 +0800 From: Zhen Lei <thunder.leizhen@...wei.com> To: Jean-Philippe Brucker <jean-philippe.brucker@....com>, John Garry <john.garry@...wei.com>, Robin Murphy <robin.murphy@....com>, Will Deacon <will.deacon@....com>, Joerg Roedel <joro@...tes.org>, Jonathan Corbet <corbet@....net>, linux-doc <linux-doc@...r.kernel.org>, Sebastian Ott <sebott@...ux.ibm.com>, Gerald Schaefer <gerald.schaefer@...ibm.com>, "Martin Schwidefsky" <schwidefsky@...ibm.com>, Heiko Carstens <heiko.carstens@...ibm.com>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org>, "Michael Ellerman" <mpe@...erman.id.au>, Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "H . Peter Anvin" <hpa@...or.com>, David Woodhouse <dwmw2@...radead.org>, iommu <iommu@...ts.linux-foundation.org>, linux-kernel <linux-kernel@...r.kernel.org>, linux-s390 <linux-s390@...r.kernel.org>, linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, x86 <x86@...nel.org>, linux-ia64 <linux-ia64@...r.kernel.org> CC: Zhen Lei <thunder.leizhen@...wei.com>, Hanjun Guo <guohanjun@...wei.com> Subject: [PATCH v8 2/7] x86/dma: use IS_ENABLED() to simplify the code This patch removes the ifdefs around CONFIG_IOMMU_DEFAULT_PASSTHROUGH to improve readablity. Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com> --- arch/x86/kernel/pci-dma.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index dcd272dbd0a9330..9f2b19c35a060df 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -43,11 +43,8 @@ * It is also possible to disable by default in kernel config, and enable with * iommu=nopt at boot time. */ -#ifdef CONFIG_IOMMU_DEFAULT_PASSTHROUGH -int iommu_pass_through __read_mostly = 1; -#else -int iommu_pass_through __read_mostly; -#endif +int iommu_pass_through __read_mostly = + IS_ENABLED(CONFIG_IOMMU_DEFAULT_PASSTHROUGH); extern struct iommu_table_entry __iommu_table[], __iommu_table_end[]; -- 1.8.3
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