Li Li wrote: > Nicolas, > > Thanks for the explanation. :) > > I noticed what you mentioned. Actually, Kconfig says TLS EMU might be > used in some "old" (e.g. pre-armv6) SMP platforms without TLS > register. In such a case, could we still ensure it's SMP safe by a > single ldr?
In that case, the hardware TLS 'mcr' is used, which traps and is emulated by the undefined instruction handler. It's not fast but presumably those platforms don't really matter. See CONFIG_TLS_REG_EMUL in arch/arm/kernel/traps.c, and 'tls_emu'. 'tls_emu' is a constant, so if a kernel built for TLS emulation is run on something which has the TLS register, it will not work properly. -- JAmie -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
