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    Subject[PATCH V2 06/15] genirq: Generic chip: Optimize for fixed-endian systems
    Date
    Allow the compiler to inline an LE MMIO access if the configuration only
    supports LE registers, or a BE MMIO access if the configuration only
    supports BE registers. If the configuration supports both (possibly
    a multiplatform kernel) then make the decision at runtime.

    Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
    ---
    kernel/irq/Kconfig | 5 +++++
    kernel/irq/Makefile | 1 +
    kernel/irq/generic-chip.c | 10 +++++++++-
    3 files changed, 15 insertions(+), 1 deletion(-)

    diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig
    index 225086b..6283c8c 100644
    --- a/kernel/irq/Kconfig
    +++ b/kernel/irq/Kconfig
    @@ -51,6 +51,11 @@ config GENERIC_IRQ_CHIP
    bool
    select IRQ_DOMAIN

    +# Same as above, but use big-endian MMIO accesses
    +config GENERIC_IRQ_CHIP_BE
    + bool
    + select IRQ_DOMAIN
    +
    # Generic irq_domain hw <--> linux irq number translation
    config IRQ_DOMAIN
    bool
    diff --git a/kernel/irq/Makefile b/kernel/irq/Makefile
    index fff1738..34c2b0f 100644
    --- a/kernel/irq/Makefile
    +++ b/kernel/irq/Makefile
    @@ -1,6 +1,7 @@

    obj-y := irqdesc.o handle.o manage.o spurious.o resend.o chip.o dummychip.o devres.o
    obj-$(CONFIG_GENERIC_IRQ_CHIP) += generic-chip.o
    +obj-$(CONFIG_GENERIC_IRQ_CHIP_BE) += generic-chip.o
    obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o
    obj-$(CONFIG_IRQ_DOMAIN) += irqdomain.o
    obj-$(CONFIG_PROC_FS) += proc.o
    diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c
    index c1890bb..457ea48 100644
    --- a/kernel/irq/generic-chip.c
    +++ b/kernel/irq/generic-chip.c
    @@ -9,6 +9,7 @@
    #include <linux/export.h>
    #include <linux/irqdomain.h>
    #include <linux/interrupt.h>
    +#include <linux/kconfig.h>
    #include <linux/kernel_stat.h>
    #include <linux/syscore_ops.h>

    @@ -19,7 +20,14 @@ static DEFINE_RAW_SPINLOCK(gc_lock);

    static int is_big_endian(struct irq_chip_generic *gc)
    {
    - return !!(gc->domain->gc->gc_flags & IRQ_GC_BE_IO);
    + if (IS_ENABLED(CONFIG_GENERIC_IRQ_CHIP) &&
    + !IS_ENABLED(CONFIG_GENERIC_IRQ_CHIP_BE))
    + return 0;
    + else if (IS_ENABLED(CONFIG_GENERIC_IRQ_CHIP_BE) &&
    + !IS_ENABLED(CONFIG_GENERIC_IRQ_CHIP))
    + return 1;
    + else
    + return !!(gc->domain->gc->gc_flags & IRQ_GC_BE_IO);
    }

    static void irq_reg_writel(struct irq_chip_generic *gc,
    --
    2.1.1


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