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    SubjectRe: [PATCH v1 2/2] powerpc/debug: hook to user return notifier infrastructure
    Date
    Luming Yu <luming.yu@shingroup.cn> writes:

    > Before we have powerpc to use the generic entry infrastructure,
    > the call to fire user return notifier is made temporarily in powerpc
    > entry code.
    >

    It is still not clear what will be registered as user return notifier.
    Can you summarize that here?

    >
    > Signed-off-by: Luming Yu <luming.yu@shingroup.cn>
    > ---
    > arch/powerpc/kernel/interrupt.c | 3 +++
    > 1 file changed, 3 insertions(+)
    >
    > diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
    > index c4f6d3c69ba9..7fe704946e96 100644
    > --- a/arch/powerpc/kernel/interrupt.c
    > +++ b/arch/powerpc/kernel/interrupt.c
    > @@ -19,6 +19,7 @@
    > #include <asm/time.h>
    > #include <asm/tm.h>
    > #include <asm/unistd.h>
    > +#include <asm/entry-common.h>
    >
    > #if defined(CONFIG_PPC_ADV_DEBUG_REGS) && defined(CONFIG_PPC32)
    > unsigned long global_dbcr0[NR_CPUS];
    > @@ -245,6 +246,8 @@ interrupt_exit_user_prepare_main(unsigned long ret, struct pt_regs *regs)
    > /* Restore user access locks last */
    > kuap_user_restore(regs);
    >
    > + arch_exit_to_user_mode_prepare(regs, ti_flags);
    > +
    >

    That will run the notifier with user AMR/IAMR values.

    > return ret;
    > }
    >
    > --
    > 2.42.0.windows.2

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