Hi, On Wed, Apr 09, 2014 at 01:19:29PM +0800, Fengguang Wu wrote: > b9dbdce1 Ralf Baechle 2010-08-05 27 ifdef CONFIG_SGI_IP28 > b9dbdce1 Ralf Baechle 2010-08-05 28 ifeq ($(call cc-option-yn,-mr10k-cache-barrier=store), n) > b9dbdce1 Ralf Baechle 2010-08-05 @29 $(error gcc doesn't support needed option -mr10k-cache-barrier=store) > b9dbdce1 Ralf Baechle 2010-08-05 30 endif > b9dbdce1 Ralf Baechle 2010-08-05 31 endif > b9dbdce1 Ralf Baechle 2010-08-05 32 platform-$(CONFIG_SGI_IP28) += sgi-ip22/ > b9dbdce1 Ralf Baechle 2010-08-05 33 cflags-$(CONFIG_SGI_IP28) += -mr10k-cache-barrier=store -I$(srctree)/arch/mips/include/asm/mach-ip28 > b9dbdce1 Ralf Baechle 2010-08-05 34 load-$(CONFIG_SGI_IP28) += 0xa800000020004000 Its IP28 only fixes in gcc see here: http://gcc.gnu.org/ml/gcc-patches/2008-09/msg00041.html Most likely they never made it into gcc upstream but they are necessary working around the r10k speculative stores on non cache coherent machines like the IP28. Flo -- Florian Lohoff f@xxxxx
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