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    Subject[PATCH V5 38/50] x86/entry: Add a C macro to define the function body for IST in .entry.text
    Date
    From: Lai Jiangshan <laijs@linux.alibaba.com>

    Add DEFINE_IDTENTRY_IST_ETNRY() macro to define C code to implement
    the ASM code which calls paranoid_entry(), cfunc(), paranoid_exit()
    in series for IST exceptions without error code.

    Not functional difference intended.

    Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
    ---
    arch/x86/include/asm/idtentry.h | 14 ++++++++++++++
    1 file changed, 14 insertions(+)

    diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
    index cf41901227ed..0f615943a460 100644
    --- a/arch/x86/include/asm/idtentry.h
    +++ b/arch/x86/include/asm/idtentry.h
    @@ -337,6 +337,20 @@ void ist_paranoid_exit(unsigned long cr3, unsigned long gsbase);
    __visible noinstr void kernel_##func(struct pt_regs *regs, unsigned long error_code); \
    __visible noinstr void user_##func(struct pt_regs *regs, unsigned long error_code)

    +/**
    + * DEFINE_IDTENTRY_IST_ENTRY - Emit __entry_text code for IST entry points
    + * @func: Function name of the entry point
    + */
    +#define DEFINE_IDTENTRY_IST_ETNRY(func) \
    +__visible __entry_text void ist_##func(struct pt_regs *regs) \
    +{ \
    + unsigned long cr3, gsbase; \
    + \
    + ist_paranoid_entry(&cr3, &gsbase); \
    + func(regs); \
    + ist_paranoid_exit(cr3, gsbase); \
    +}
    +
    /**
    * DEFINE_IDTENTRY_IST - Emit code for IST entry points
    * @func: Function name of the entry point
    --
    2.19.1.6.gb485710b
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