Re: [PATCH 1/3] [MIPS] lockdep: fix TRACE_IRQFLAGS_SUPPORT

[Atsushi Nemoto <anemo@mba.ocn.ne.jp>]

On Tue, 26 Sep 2006 23:43:40 +0900 (JST), Atsushi Nemoto <anemo@mba.ocn.ne.jp> 
wrote:
> In handle_sys and its variants, we must reload some registers which
> might be clobbered by trace_hardirqs_on().
> Also we must make sure trace_hardirqs_on() called in kernel level (not
> exception level).

And there is one more suspicious code in arch/mips/kernel/entry.S:

FEXPORT(restore_partial)                # restore partial frame
#ifdef CONFIG_TRACE_IRQFLAGS
        SAVE_STATIC
        SAVE_AT
        SAVE_TEMP
        LONG_L  v0, PT_STATUS(sp)
        and     v0, 1
        beqz    v0, 1f
        jal     trace_hardirqs_on
        b       2f
1:      jal     trace_hardirqs_off
2:
        RESTORE_TEMP
        RESTORE_AT
        RESTORE_STATIC
#endif
        RESTORE_SOME
        RESTORE_SP_AND_RET
        .set    at

Is this correct if CONFIG_MIPS_MT_SMTC enabled?

---
Atsushi Nemoto