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    Subject[PATCH 22/24] ARM: enable earlyprintk=xen
    Date
    From: Ian Campbell <ian.campbell@citrix.com>

    Currently ARM setup_early_printk does not support alternative early
    consoles and it always registers early_console only.

    This patch adds support for xenboot_console.

    Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
    Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
    ---
    arch/arm/kernel/early_printk.c | 11 ++++++++++-
    1 files changed, 10 insertions(+), 1 deletions(-)

    diff --git a/arch/arm/kernel/early_printk.c b/arch/arm/kernel/early_printk.c
    index 85aa2b2..eecfa21 100644
    --- a/arch/arm/kernel/early_printk.c
    +++ b/arch/arm/kernel/early_printk.c
    @@ -11,6 +11,8 @@
    #include <linux/kernel.h>
    #include <linux/console.h>
    #include <linux/init.h>
    +#include <linux/string.h>
    +#include <xen/hvc-console.h>

    extern void printch(int);

    @@ -50,7 +52,14 @@ asmlinkage void early_printk(const char *fmt, ...)

    static int __init setup_early_printk(char *buf)
    {
    - register_console(&early_console);
    + if (!buf || !strncmp(buf, "serial", 6))
    + register_console(&early_console);
    +
    +#ifdef CONFIG_HVC_XEN
    + if (!strncmp(buf, "xen", 3))
    + register_console(&xenboot_console);
    +#endif
    +
    return 0;
    }

    --
    1.7.2.5


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