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Date:   Thu, 21 Dec 2017 16:55:10 +0800
From:   Xishi Qiu <>
To:     Toshi Kani <>, "H. Peter Anvin" <>,
        "Thomas Gleixner" <>,
        Ingo Molnar <>
CC:     LKML <>, Linux MM <>,
        "Xishi Qiu" <>
Subject: [RFC] does ioremap() cause memory leak?

When we use iounmap() to free the mapping, it calls unmap_vmap_area() to clear page table,
but do not free the memory of page table, right?

So when use ioremap() to mapping another area(incluce the area before), it may use
large mapping(e.g. ioremap_pmd_enabled()), so the original page table memory(e.g. pte memory)
will be lost, it cause memory leak, right?

Xishi Qiu

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