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    SubjectRe: [PATCH] mm: make ioremap_prot() take a pgprot.
    On Wed, 3 Nov 2010 05:31:03 +0900
    Paul Mundt <lethal@linux-sh.org> wrote:

    > The current definition of ioremap_prot() takes an unsigned long for the
    > page flags and then converts to/from a pgprot as necessary. This is
    > unfortunately not sufficient for the SH-X2 TLB case which has a 64-bit
    > pgprot and a 32-bit unsigned long.
    >
    > An inspection of the tree shows that tile and cris also have their
    > own equivalent routines that are using the pgprot_t but do not set
    > HAVE_IOREMAP_PROT, both of which could trivially be adapted.
    >
    > After cris/tile are updated there would also be enough critical mass to
    > move the powerpc devm_ioremap_prot() in to the generic lib/devres.c.

    In file included from sound/drivers/mpu401/mpu401_uart.c:31:
    arch/x86/include/asm/io.h:199: error: syntax error before 'pgprot_t'
    arch/x86/include/asm/io.h:199: warning: function declaration isn't a prototype

    because asm/io.h now needs asm/pgtable.h for pgprot_t.

    I tried that:

    --- a/arch/powerpc/include/asm/io.h~mm-make-ioremap_prot-take-a-pgprot-fix
    +++ a/arch/powerpc/include/asm/io.h
    @@ -27,6 +27,7 @@ extern int check_legacy_ioport(unsigned
    #include <asm/synch.h>
    #include <asm/delay.h>
    #include <asm/mmu.h>
    +#include <asm/pgtable.h>

    #include <asm-generic/iomap.h>

    --- a/arch/x86/include/asm/io.h~mm-make-ioremap_prot-take-a-pgprot-fix
    +++ a/arch/x86/include/asm/io.h
    @@ -40,6 +40,7 @@
    #include <linux/compiler.h>
    #include <asm-generic/int-ll64.h>
    #include <asm/page.h>
    +#include <asm/pgtable.h>

    #include <xen/xen.h>

    and it blew up because pgtable.h needs spinlock.h for spinlock_t.
    Gave up.


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