Match the R4000 semantics for the initial state of interrupt/kernel status register flags for the R3000 in kernel_thread(). Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxxxxxxxx> --- The R4000 variation preserves the interrupt/kernel status flags; the R3000 assumes a certain state. It may not matter, at least at the current state of the code, but for consistency I think the R3000 variation should do the same as the R4000 one, first for purity and second because there is less maintenance force available for the R3000 and any discrepancy between the two variations means a greater chance for subtle bugs. The performance hit is negligible. Tested at the runtime. Please consider. Maciej patch-mips-2.6.23-rc5-20070904-r3000-process-1 diff -up --recursive --new-file linux-mips-2.6.23-rc5-20070904.macro/arch/mips/kernel/process.c linux-mips-2.6.23-rc5-20070904/arch/mips/kernel/process.c --- linux-mips-2.6.23-rc5-20070904.macro/arch/mips/kernel/process.c 2007-09-04 04:55:19.000000000 +0000 +++ linux-mips-2.6.23-rc5-20070904/arch/mips/kernel/process.c 2007-09-18 15:43:16.000000000 +0000 @@ -231,8 +231,8 @@ long kernel_thread(int (*fn)(void *), vo regs.cp0_epc = (unsigned long) kernel_thread_helper; regs.cp0_status = read_c0_status(); #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) - regs.cp0_status &= ~(ST0_KUP | ST0_IEC); - regs.cp0_status |= ST0_IEP; + regs.cp0_status = (regs.cp0_status & ~(ST0_KUP | ST0_IEP | ST0_IEC)) | + ((regs.cp0_status & (ST0_KUC | ST0_IEC)) << 2); #else regs.cp0_status |= ST0_EXL; #endif
