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Date:   Sat, 9 May 2020 11:37:15 -0400
From:   Qian Cai <>
To:     Nicholas Piggin <>
Cc:     Christophe Leroy <>,
        Michael Ellerman <>,
        LKML <>,
        linuxppc-dev <>
Subject: Re: ioremap() called early from pnv_pci_init_ioda_phb()

> On May 9, 2020, at 4:38 AM, Nicholas Piggin <> wrote:
> Your patch to use early_ioremap is faulting? I wonder why?

Yes, I don’t know the reasons either. I suppose not many places in other parts of the kernel which keep using those addresses from early_ioremap() after system booted. Otherwise, we would see those leak warnings elsewhere.

Thus, we probably have to audit the code, and if still necessary, call early_ioremap() and then early_iounmap() followed by a ioremap() once slab allocator is available?

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