user/sven/linux.git/arch/csky, branch v5.4.43

csky: Fixup init_fpu compile warning with __init

2020-04-23T08:36:41Z

[ Upstream commit 12879bda3c2a974b7e4fe199a9c21f0c5f6bca04 ] WARNING: vmlinux.o(.text+0x2366): Section mismatch in reference from the function csky_start_secondary() to the function .init.text:init_fpu() The function csky_start_secondary() references the function __init init_fpu(). This is often because csky_start_secondary lacks a __init annotation or the annotation of init_fpu is wrong. Reported-by: Lu Chongzhi Signed-off-by: Guo Ren Signed-off-by: Sasha Levin

csky: Fixup get wrong psr value from phyical reg

2020-04-23T08:36:38Z

[ Upstream commit 9c0e343d7654a329d1f9b53d253cbf7fb6eff85d ] We should get psr value from regs->psr in stack, not directly get it from phyiscal register then save the vector number in tsk->trap_no. Signed-off-by: Guo Ren Signed-off-by: Sasha Levin

csky: Fixup cpu speculative execution to IO area

2020-04-23T08:36:38Z

[ Upstream commit aefd9461d34a1b0a2acad0750c43216c1c27b9d4 ] For the memory size ( > 512MB, < 1GB), the MSA setting is: - SSEG0: PHY_START , PHY_START + 512MB - SSEG1: PHY_START + 512MB, PHY_START + 1GB But the real memory is no more than 1GB, there is a gap between the end size of memory and border of 1GB. CPU could speculatively execute to that gap and if the gap of the bus couldn't respond to the CPU request, then the crash will happen. Now make the setting with: - SSEG0: PHY_START , PHY_START + 512MB (no change) - SSEG1: Disabled (We use highmem to use the memory of 512MB~1GB) We also deprecated zhole_szie[] settings, it's only used by arm style CPUs. All memory gap should use Reserved setting of dts in csky system. Signed-off-by: Guo Ren Signed-off-by: Sasha Levin

csky: Implement copy_thread_tls

2020-03-12T12:00:32Z

commit 0b9f386c4be6493d282aab0af6f9b70c62142777 upstream. This is required for clone3 which passes the TLS value through a struct rather than a register. Cc: Amanieu d'Antras Signed-off-by: Guo Ren Signed-off-by: Greg Kroah-Hartman

arch/csky: fix some Kconfig typos

2020-03-12T12:00:17Z

[ Upstream commit bebd26ab623616728d6e72b5c74a47bfff5287d8 ] Fix wording in help text for the CPU_HAS_LDSTEX symbol. Signed-off-by: Randy Dunlap Signed-off-by: Guo Ren Signed-off-by: Guo Ren Signed-off-by: Sasha Levin

csky: Fixup compile warning for three unimplemented syscalls

2020-03-12T12:00:16Z

[ Upstream commit 2305f60b76110cb3e8658a4ae85d1f7eb0c66a5b ] Implement fstat64, fstatat64, clone3 syscalls to fixup checksyscalls.sh compile warnings. Signed-off-by: Guo Ren Signed-off-by: Sasha Levin

csky: Fixup ftrace modify panic

2020-03-12T12:00:16Z

[ Upstream commit 359ae00d12589c31cf103894d0f32588d523ca83 ] During ftrace init, linux will replace all function prologues (call_mcout) with nops, but it need flush_dcache and invalidate_icache to make it work. So flush_cache functions couldn't be nested called by ftrace framework. Signed-off-by: Guo Ren Signed-off-by: Sasha Levin

csky/smp: Fixup boot failed when CONFIG_SMP

2020-03-12T12:00:16Z

[ Upstream commit c9492737b25ca32679ba3163609d938c9abfd508 ] If we use a non-ipi-support interrupt controller, it will cause panic here. We should let cpu up and work with CONFIG_SMP, when we use a non-ipi intc. Signed-off-by: Guo Ren Signed-off-by: Sasha Levin

csky: Set regs->usp to kernel sp, when the exception is from kernel

2020-03-12T12:00:16Z

[ Upstream commit f8e17c17b81070f38062dce79ca7f4541851dadd ] In the past, we didn't care about kernel sp when saving pt_reg. But in some cases, we still need pt_reg->usp to represent the kernel stack before enter exception. For cmpxhg in atomic.S, we need save and restore usp for above. Signed-off-by: Guo Ren Signed-off-by: Sasha Levin

csky/mm: Fixup export invalid_pte_table symbol

2020-03-12T12:00:16Z

[ Upstream commit 7f4a567332f035ab16b29010fbd04a0f10183c77 ] There is no present bit in csky pmd hardware, so we need to prepare invalid_pte_table for empty pmd entry and the functions (pmd_none & pmd_present) in pgtable.h need invalid_pte_talbe to get result. If a module use these functions, we need export the symbol for it. Signed-off-by: Guo Ren Cc: Mo Qihui Cc: Zhange Jian Signed-off-by: Sasha Levin