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    Subject[PATCH 5.14 786/849] ARM: 9155/1: fix early early_iounmap()
    Date
    From: Michał Mirosław <mirq-linux@rere.qmqm.pl>

    commit 0d08e7bf0d0d1a29aff7b16ef516f7415eb1aa05 upstream.

    Currently __set_fixmap() bails out with a warning when called in early boot
    from early_iounmap(). Fix it, and while at it, make the comment a bit easier
    to understand.

    Cc: <stable@vger.kernel.org>
    Fixes: b089c31c519c ("ARM: 8667/3: Fix memory attribute inconsistencies when using fixmap")
    Acked-by: Ard Biesheuvel <ardb@kernel.org>
    Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
    Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/arm/mm/mmu.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/arch/arm/mm/mmu.c
    +++ b/arch/arm/mm/mmu.c
    @@ -390,9 +390,9 @@ void __set_fixmap(enum fixed_addresses i
    BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) < FIXADDR_START);
    BUG_ON(idx >= __end_of_fixed_addresses);

    - /* we only support device mappings until pgprot_kernel has been set */
    + /* We support only device mappings before pgprot_kernel is set. */
    if (WARN_ON(pgprot_val(prot) != pgprot_val(FIXMAP_PAGE_IO) &&
    - pgprot_val(pgprot_kernel) == 0))
    + pgprot_val(prot) && pgprot_val(pgprot_kernel) == 0))
    return;

    if (pgprot_val(prot))

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