linux-kernel - Re: [PATCH 5/5] iommu/tegra-smmu: Add pagetable mappings to debugfs

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Message-ID: <a321fc27-54ba-9ba5-7121-4598a7f94795@gmail.com>
Date:   Sun, 27 Sep 2020 00:37:56 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Nicolin Chen <nicoleotsuka@...il.com>, thierry.reding@...il.com,
        joro@...tes.org, krzk@...nel.org
Cc:     linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, jonathanh@...dia.com
Subject: Re: [PATCH 5/5] iommu/tegra-smmu: Add pagetable mappings to debugfs

27.09.2020 00:24, Dmitry Osipenko пишет:
> 26.09.2020 11:07, Nicolin Chen пишет:
> ...
>> +	for (pd_index = 0; pd_index < SMMU_NUM_PDE; pd_index++) {
>> +		struct page *pt;
>> +		u32 *addr;
>> +
>> +		if (!as->count[pd_index] || !pd[pd_index])
>> +			continue;
> 
> I guess the idea of this patch is to print out the hardware state, isn't
> it? Hence the as->count shouldn't be checked here.

Perhaps also will be good to check whether the state of
!as->count[pd_index] matches state of !pd[pd_index].

WARN_ON_ONCE(!as->count[pd_index] ^ !pd[pd_index])