path: root/arch/csky
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2019-04-22csky: Support vmlinux bootup with MMU offGuo Ren-85/+90
Modify SETUP_MMU macro to fit on both MMU-on or MMU-off enviornment and vmlinux could bootup from MMU off enviornment for some cases. Unify the style of _start and _start_smp_secondary in head.S to make head.S looks more concise and easy to understand. Signed-off-by: Guo Ren <> Cc: Arnd Bergmann <>
2019-04-22csky: Add perf_arch_fetch_caller_regs supportMao Han-0/+10
In trace events as tracepoints context are not able to be retrieve with task_pt_regs. Without arch caller regs support the pt_regs context will be all zero, perf can not parsing the callchain and resolving the symbols correctly, some time will even get into deadlock while handling the page fault, eg: perf kmem —page record ls Changelog - Add test case cmd in comment - Use regs_fp(regs) which is defined in abi/regdef.h Signed-off-by: Mao Han <> Signed-off-by: Guo Ren <>
2019-04-22csky: Fixup wrong update_mmu_cache implementationGuo Ren-11/+2
In our stress test, we found some crash problem caused by: if (!(vma->vm_flags & VM_EXEC)) return; in update_mmu_cache(). Seems current update_mmu_cache implementation is wrong and we retread to the conservative implementation. Also the usage of kmap_atomic in update_mmu_cache is risky, page-virtual may be scheduled out and changed, so we must use preempt_disable & pagefault_disable which is called by kmap_atomic(). Signed-off-by: Guo Ren <> Cc: Arnd Bergmann <>
2019-04-22csky: Support dynamic start physical addressGuo Ren-31/+106
Before this patch csky-linux need CONFIG_RAM_BASE to determine start physical address. Now we use phys_offset variable to replace the macro of PHYS_OFFSET and we setup phys_offset with real physical address which is determined during startup in head.S. With this patch we needn't re-compile kernel for different start physical address. ie: 0x0 / 0xc0000000 start physical address could use the same vmlinux, be care different start address must be 512MB aligned. Signed-off-by: Guo Ren <> Cc: Arnd Bergmann <>
2019-04-22csky: Reconstruct signal processingGuo Ren-274/+150
Linux kernel has provided some apis for arch signal's implementation. For example: restore_saved_sigmask() set_current_blocked() restore_altstack() But in last version of csky signal.c didn't use them and some codes are confusing, so reconstruct signal.c with reference to riscv's code. Now csky signal.c implementation are very close to riscv and we can get the following benefits: - Clear code structure - The signal code of riscv and csky can be reviewed together - Promoting the unification of arch's signal implementation Also modified the related code in entry.S Signed-off-by: Guo Ren <> Cc: Arnd Bergmann <>
2019-04-22csky: Use in_syscall & forget_syscall instead of r11_sigGuo Ren-20/+22
We could use regs->sr 16-24 bits to detect syscall: VEC_TRAP0 and r11_sig is no necessary for current implementation. In this patch, we implement the in_syscall and forget_syscall which are inspired from arm & nds32, but csky pt_regs has no syscall_num element and we just set zero to regs->sr's vector-bits-field instead. For ret_from_fork, current task was forked from parent which is in syscall progress and its regs->sr has been already setted with VEC_TRAP0. See: arch/csky/kernel/process.c: copy_thread() Signed-off-by: Guo Ren <>
2019-04-22csky: Add non-uapi asm/ptrace.h namespaceGuo Ren-20/+29
Move #ifdef __KERNEL__ code in the uapi namespace to non-uapi include/asm/ptrace.h namespace and remove #ifdef __KERNEL__ in include/asm/ptrace.h. Seperate ptrace.h in uapi and non-uapi is more common and clear. Signed-off-by: Guo Ren <> Cc: Dmitry V. Levin <>
2019-04-22csky: mm/fault.c: Remove duplicate headerJagadeesh Pagadala-1/+0
Remove duplicate header which is included twice. Signed-off-by: Jagadeesh Pagadala <> Signed-off-by: Guo Ren <>
2019-04-22csky: remove redundant generic-yMasahiro Yamada-1/+0
Since commit 7cbbbb8bc297 ("kbuild: warn redundant generic-y"), redundant generic-y is reported. I missed to delete this one. scripts/Makefile.asm-generic:25: redundant generic-y found in arch/csky/include/asm/Kbuild: ftrace.h In this case, csky-specific implementation exists in arch/csky/include/asm/ftrace.h Signed-off-by: Masahiro Yamada <> Signed-off-by: Guo Ren <>
2019-04-22csky: Update syscall_trace_enter/exit implementationGuo Ren-55/+67
Previous syscall_trace implementation couldn't support AUDITSYSCALL and SYSCALL_TRACEPOINTS. Now we redesign it to support audit_syscall and syscall_tracepoints just like other archs'. Signed-off-by: Guo Ren <> Cc: Dmitry V. Levin <> Cc: Arnd Bergmann <>
2019-04-22csky: Add perf callchain supportMao Han-0/+120
This patch add support for perf callchain sampling on csky platform. As fp is used to unwind the stack, the program being sampled and the C library need to be compiled with -mbacktrace for user callchains, kernel callchains require CONFIG_STACKTRACE = y. Changelog: - Coding convention with Christoph's advice for riscv's. Signed-off-by: Mao Han <> Signed-off-by: Guo Ren <> Cc: Christoph Hellwig <>
2019-04-22csky/ftrace: Add dynamic function tracer (include graph tracer)Guo Ren-6/+202
Support dynamic ftrace including dynamic graph tracer. Gcc-csky with -pg will produce call site in every function prologue and we can use these call site to hook trace function. gcc with -pg origin call site: push lr jbsr _mcount nop32 nop32 If the (callee - caller)'s offset is in range of bsr instruction, we'll modify code with: push lr bsr _mcount nop32 nop32 Else if the (callee - caller)'s offset is out of bsr instrunction, we'll modify code with: push lr movih r26, ... ori r26, ... jsr r26 (r26 is reserved for jsr link reg in csky abiv2 spec.) Signed-off-by: Guo Ren <>
2019-04-22csky: Fixup vdsp&fpu issues in kernelGuo Ren-6/+2
This fixup is continue to commit 35ff802af1c4 (csky: fixup remove vdsp implement for kernel.) and in that patch I didn't finish the job. We must forbid gcc to generate any vdsp & fpu instructions and remove vdsp asm in memmove.S. eg: For GCC it's -mcpu=ck860 and For AS it's -Wa,-mcpu=ck860fv Signed-off-by: Guo Ren <>
2019-04-05syscalls: Remove start and number from syscall_set_arguments() argsSteven Rostedt (VMware)-10/+4
After removing the start and count arguments of syscall_get_arguments() it seems reasonable to remove them from syscall_set_arguments(). Note, as of today, there are no users of syscall_set_arguments(). But we are told that there will be soon. But for now, at least make it consistent with syscall_get_arguments(). Link: Cc: Oleg Nesterov <> Cc: Kees Cook <> Cc: Andy Lutomirski <> Cc: Dominik Brodowski <> Cc: Dave Martin <> Cc: "Dmitry V. Levin" <> Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Acked-by: Max Filippov <> # For xtensa changes Acked-by: Will Deacon <> # For the arm64 bits Reviewed-by: Thomas Gleixner <> # for x86 Reviewed-by: Dmitry V. Levin <> Signed-off-by: Steven Rostedt (VMware) <>
2019-04-05syscalls: Remove start and number from syscall_get_arguments() argsSteven Rostedt (Red Hat)-10/+4
At Linux Plumbers, Andy Lutomirski approached me and pointed out that the function call syscall_get_arguments() implemented in x86 was horribly written and not optimized for the standard case of passing in 0 and 6 for the starting index and the number of system calls to get. When looking at all the users of this function, I discovered that all instances pass in only 0 and 6 for these arguments. Instead of having this function handle different cases that are never used, simply rewrite it to return the first 6 arguments of a system call. This should help out the performance of tracing system calls by ptrace, ftrace and perf. Link: Cc: Oleg Nesterov <> Cc: Kees Cook <> Cc: Andy Lutomirski <> Cc: Dominik Brodowski <> Cc: Dave Martin <> Cc: "Dmitry V. Levin" <> Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Acked-by: Paul Burton <> # MIPS parts Acked-by: Max Filippov <> # For xtensa changes Acked-by: Will Deacon <> # For the arm64 bits Reviewed-by: Thomas Gleixner <> # for x86 Reviewed-by: Dmitry V. Levin <> Reported-by: Andy Lutomirski <> Signed-off-by: Steven Rostedt (VMware) <>
2019-04-04csky: Fix syscall_get_arguments() and syscall_set_arguments()Dmitry V. Levin-4/+6
C-SKY syscall arguments are located in orig_a0,a1,a2,a3,regs[0],regs[1] fields of struct pt_regs. Due to an off-by-one bug and a bug in pointer arithmetic syscall_get_arguments() was reading orig_a0,regs[1..5] fields instead. Likewise, syscall_set_arguments() was writing orig_a0,regs[1..5] fields instead. Link: Fixes: 4859bfca11c7d ("csky: System Call") Cc: Ingo Molnar <> Cc: Kees Cook <> Cc: Andy Lutomirski <> Cc: Will Drewry <> Cc: # v4.20+ Tested-by: Guo Ren <> Acked-by: Guo Ren <> Signed-off-by: Dmitry V. Levin <> Signed-off-by: Steven Rostedt (VMware) <>
2019-03-17kbuild: force all architectures except um to include mandatory-yMasahiro Yamada-2/+0
Currently, every arch/*/include/uapi/asm/Kbuild explicitly includes the common Kbuild.asm file. Factor out the duplicated include directives to scripts/Makefile.asm-generic so that no architecture would opt out of the mandatory-y mechanism. um is not forced to include mandatory-y since it is a very exceptional case which does not support UAPI. Signed-off-by: Masahiro Yamada <>
2019-03-12treewide: add checks for the return value of memblock_alloc*()Mike Rapoport-0/+5
Add check for the return value of memblock_alloc*() functions and call panic() in case of error. The panic message repeats the one used by panicing memblock allocators with adjustment of parameters to include only relevant ones. The replacement was mostly automated with semantic patches like the one below with manual massaging of format strings. @@ expression ptr, size, align; @@ ptr = memblock_alloc(size, align); + if (!ptr) + panic("%s: Failed to allocate %lu bytes align=0x%lx\n", __func__, size, align); [ use '%pa' with 'phys_addr_t' type] Link: [ fix format strings for panics after memblock_alloc] Link: [ don't panic if the allocation in sparse_buffer_init fails] Link: [ fix xtensa printk warning] Link: Signed-off-by: Mike Rapoport <> Signed-off-by: Anders Roxell <> Reviewed-by: Guo Ren <> [c-sky] Acked-by: Paul Burton <> [MIPS] Acked-by: Heiko Carstens <> [s390] Reviewed-by: Juergen Gross <> [Xen] Reviewed-by: Geert Uytterhoeven <> [m68k] Acked-by: Max Filippov <> [xtensa] Cc: Catalin Marinas <> Cc: Christophe Leroy <> Cc: Christoph Hellwig <> Cc: "David S. Miller" <> Cc: Dennis Zhou <> Cc: Greentime Hu <> Cc: Greg Kroah-Hartman <> Cc: Guan Xuetao <> Cc: Guo Ren <> Cc: Mark Salter <> Cc: Matt Turner <> Cc: Michael Ellerman <> Cc: Michal Simek <> Cc: Petr Mladek <> Cc: Richard Weinberger <> Cc: Rich Felker <> Cc: Rob Herring <> Cc: Rob Herring <> Cc: Russell King <> Cc: Stafford Horne <> Cc: Tony Luck <> Cc: Vineet Gupta <> Cc: Yoshinori Sato <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2019-03-10Merge tag 'dma-mapping-5.1' of git:// Torvalds-2/+0
Pull DMA mapping updates from Christoph Hellwig: - add debugfs support for dumping dma-debug information (Corentin Labbe) - Kconfig cleanups (Andy Shevchenko and me) - debugfs cleanups (Greg Kroah-Hartman) - improve dma_map_resource and use it in the media code - arch_setup_dma_ops / arch_teardown_dma_ops cleanups - various small cleanups and improvements for the per-device coherent allocator - make the DMA mask an upper bound and don't fail "too large" dma mask in the remaning two architectures - this will allow big driver cleanups in the following merge windows * tag 'dma-mapping-5.1' of git:// (21 commits) Documentation/DMA-API-HOWTO: update dma_mask sections sparc64/pci_sun4v: allow large DMA masks sparc64/iommu: allow large DMA masks sparc64: refactor the ali DMA quirk ccio: allow large DMA masks dma-mapping: remove the DMA_MEMORY_EXCLUSIVE flag dma-mapping: remove dma_mark_declared_memory_occupied dma-mapping: move CONFIG_DMA_CMA to kernel/dma/Kconfig dma-mapping: improve selection of dma_declare_coherent availability dma-mapping: remove an incorrect __iommem annotation of: select OF_RESERVED_MEM automatically device.h: dma_mem is only needed for HAVE_GENERIC_DMA_COHERENT mfd/sm501: depend on HAS_DMA dma-mapping: add a kconfig symbol for arch_teardown_dma_ops availability dma-mapping: add a kconfig symbol for arch_setup_dma_ops availability dma-mapping: move debug configuration options to kernel/dma dma-debug: add dumping facility via debugfs dma: debug: no need to check return value of debugfs_create functions videobuf2: replace a layering violation with dma_map_resource dma-mapping: don't BUG when calling dma_map_resource on RAM ...
2019-03-05Merge branch 'timers-2038-for-linus' of ↵Linus Torvalds-0/+3
git:// Pull year 2038 updates from Thomas Gleixner: "Another round of changes to make the kernel ready for 2038. After lots of preparatory work this is the first set of syscalls which are 2038 safe: 403 clock_gettime64 404 clock_settime64 405 clock_adjtime64 406 clock_getres_time64 407 clock_nanosleep_time64 408 timer_gettime64 409 timer_settime64 410 timerfd_gettime64 411 timerfd_settime64 412 utimensat_time64 413 pselect6_time64 414 ppoll_time64 416 io_pgetevents_time64 417 recvmmsg_time64 418 mq_timedsend_time64 419 mq_timedreceiv_time64 420 semtimedop_time64 421 rt_sigtimedwait_time64 422 futex_time64 423 sched_rr_get_interval_time64 The syscall numbers are identical all over the architectures" * 'timers-2038-for-linus' of git:// (36 commits) riscv: Use latest system call ABI checksyscalls: fix up mq_timedreceive and stat exceptions unicore32: Fix __ARCH_WANT_STAT64 definition asm-generic: Make time32 syscall numbers optional asm-generic: Drop getrlimit and setrlimit syscalls from default list 32-bit userspace ABI: introduce ARCH_32BIT_OFF_T config option compat ABI: use non-compat openat and open_by_handle_at variants y2038: add 64-bit time_t syscalls to all 32-bit architectures y2038: rename old time and utime syscalls y2038: remove struct definition redirects y2038: use time32 syscall names on 32-bit syscalls: remove obsolete __IGNORE_ macros y2038: syscalls: rename y2038 compat syscalls x86/x32: use time64 versions of sigtimedwait and recvmmsg timex: change syscalls to use struct __kernel_timex timex: use __kernel_timex internally sparc64: add custom adjtimex/clock_adjtime functions time: fix sys_timer_settime prototype time: Add struct __kernel_timex time: make adjtime compat handling available for 32 bit ...
2019-03-04get rid of legacy 'get_ds()' functionLinus Torvalds-1/+0
Every in-kernel use of this function defined it to KERNEL_DS (either as an actual define, or as an inline function). It's an entirely historical artifact, and long long long ago used to actually read the segment selector valueof '%ds' on x86. Which in the kernel is always KERNEL_DS. Inspired by a patch from Jann Horn that just did this for a very small subset of users (the ones in fs/), along with Al who suggested a script. I then just took it to the logical extreme and removed all the remaining gunk. Roughly scripted with git grep -l '(get_ds())' -- :^tools/ | xargs sed -i 's/(get_ds())/(KERNEL_DS)/' git grep -lw 'get_ds' -- :^tools/ | xargs sed -i '/^#define get_ds()/d' plus manual fixups to remove a few unusual usage patterns, the couple of inline function cases and to fix up a comment that had become stale. The 'get_ds()' function remains in an x86 kvm selftest, since in user space it actually does something relevant. Inspired-by: Jann Horn <> Inspired-by: Al Viro <> Signed-off-by: Linus Torvalds <>
2019-02-20dma-mapping: improve selection of dma_declare_coherent availabilityChristoph Hellwig-1/+0
This API is primarily used through DT entries, but two architectures and two drivers call it directly. So instead of selecting the config symbol for random architectures pull it in implicitly for the actual users. Also rename the Kconfig option to describe the feature better. Signed-off-by: Christoph Hellwig <> Acked-by: Paul Burton <> # MIPS Acked-by: Lee Jones <> Reviewed-by: Greg Kroah-Hartman <>
2019-02-19asm-generic: Make time32 syscall numbers optionalArnd Bergmann-0/+1
We don't want new architectures to even provide the old 32-bit time_t based system calls any more, or define the syscall number macros. Add a new __ARCH_WANT_TIME32_SYSCALLS macro that gets enabled for all existing 32-bit architectures using the generic system call table, so we don't change any current behavior. Since this symbol is evaluated in user space as well, we cannot use a Kconfig CONFIG_* macro but have to define it in uapi/asm/unistd.h. On 64-bit architectures, the same system call numbers mostly refer to the system calls we want to keep, as they already pass 64-bit time_t. As new architectures no longer provide these, we need new exceptions in Signed-off-by: Arnd Bergmann <>
2019-02-19asm-generic: Drop getrlimit and setrlimit syscalls from default listYury Norov-0/+1
The newer prlimit64 syscall provides all the functionality of getrlimit and setrlimit syscalls and adds the pid of target process, so future architectures won't need to include getrlimit and setrlimit. Therefore drop getrlimit and setrlimit syscalls from the generic syscall list unless __ARCH_WANT_SET_GET_RLIMIT is defined by the architecture's unistd.h prior to including asm-generic/unistd.h, and adjust all architectures using the generic syscall list to define it so that no in-tree architectures are affected. Cc: Arnd Bergmann <> Cc: Cc: Cc: Cc: Signed-off-by: Yury Norov <> Acked-by: Arnd Bergmann <> Acked-by: Mark Salter <> [c6x] Acked-by: James Hogan <> [metag] Acked-by: Ley Foon Tan <> [nios2] Acked-by: Stafford Horne <> [openrisc] Acked-by: Will Deacon <> [arm64] Acked-by: Vineet Gupta <> #arch/arc bits Signed-off-by: Yury Norov <> Signed-off-by: Arnd Bergmann <>
2019-02-1932-bit userspace ABI: introduce ARCH_32BIT_OFF_T config optionYury Norov-0/+1
All new 32-bit architectures should have 64-bit userspace off_t type, but existing architectures has 32-bit ones. To enforce the rule, new config option is added to arch/Kconfig that defaults ARCH_32BIT_OFF_T to be disabled for new 32-bit architectures. All existing 32-bit architectures enable it explicitly. New option affects force_o_largefile() behaviour. Namely, if userspace off_t is 64-bits long, we have no reason to reject user to open big files. Note that even if architectures has only 64-bit off_t in the kernel (arc, c6x, h8300, hexagon, nios2, openrisc, and unicore32), a libc may use 32-bit off_t, and therefore want to limit the file size to 4GB unless specified differently in the open flags. Signed-off-by: Yury Norov <> Acked-by: Arnd Bergmann <> Signed-off-by: Yury Norov <> Signed-off-by: Arnd Bergmann <>
2019-02-13of: select OF_RESERVED_MEM automaticallyChristoph Hellwig-1/+0
The OF_RESERVED_MEM can be used if we have either CMA or the generic declare coherent code built and we support the early flattened DT. So don't bother making it a user visible options that is selected by most configs that fit the above category, but just select it when the requirements are met. Signed-off-by: Christoph Hellwig <> Reviewed-by: Rob Herring <>
2019-02-13csky: Fixup dead loop in show_stackGuo Ren-0/+4
When STACKTRACE is enabled, we must pass fp as stack for unwind, otherwise random value in stack will casue a dead loop. Signed-off-by: Guo Ren <> Reported-by: Lu Baoquan <>
2019-02-13csky: Fixup io-range page attribute for mmap("/dev/mem")Guo Ren-0/+19
Some user space drivers need accessing IO address and IO remap need SO(strong order) page-attribute to make IO operation correct. So we need add SO-page-attr for all non-memory address. Signed-off-by: Guo Ren <> Reported-by: Fan Xiaodong <>
2019-02-13csky: coding convention: Use task_stack_pageGuo Ren-3/+4
Use task_stack_page instead of p->stack to get stack. Follow the coding convention style. Also for init_stack, the same with other archs. Signed-off-by: Guo Ren <>
2019-02-13csky: Fixup wrong pt_regs sizeGuo Ren-1/+2
The bug is from commit 2054f4af1957 ("csky: bugfix gdb coredump error.") We change the ELF_NGREG to ELF_NGREG - 2 to fit gdb&gcc define, but forgot modify ptrace regset. Now coredump use ELF_NRGEG to parse GPRs and ptrace use pt_regs_regset, so there are two different reg_sets for userspace. Signed-off-by: Guo Ren <>
2019-02-13csky: Fixup _PAGE_GLOBAL bit for 610 tlb entryGuo Ren-2/+2
C-SKY CPU 8xx's _PAGE_GLOBAL is BIT(0), but 610's _PAGE_GLOBAL is BIT(6). Use _PAGE_GLOBAL macro instead of bad magic number. Signed-off-by: Guo Ren <>
2019-01-10csky: fixup compile error with CPU 810.Guo Ren-1/+1
This bug is from commit f553aa1c13cb ("csky: fixup relocation error with 807 & 860"). I forgot to compile with 810 for that patch. Signed-off-by: Guo Ren <> Cc: Arnd Bergmann <> Signed-off-by: Linus Torvalds <>
2019-01-09csky: fixup compile error with pte_allocGuo Ren-25/+18
Commit: 4cf58924951e remove the address argument of pte_alloc without modify csky related code. linux-5.0-rc1 compile failed with csky. Remove the unnecessary address testing in pte_alloc(). Signed-off-by: Guo Ren <> Cc: Joel Fernandes (Google) <> Cc: Guenter Roeck <> Cc: Arnd Bergmann <> Cc: Linus Torvalds <>
2019-01-08csky: fixup CACHEV1 store instruction fast retireGuo Ren-0/+25
For I/O access, 810/807 store instruction fast retire will cause wrong primitive. For example: stw (clear interrupt source) stw (unmask interrupt controller) enable interrupt stw is fast retire instruction. When PC is run at enable interrupt stage, the clear interrupt source hasn't finished. It will cause another wrong irq-enter. So use mb() to prevent above. Signed-off-by: Guo Ren <> Cc: Lu Baoquan <>
2019-01-08csky: fixup relocation error with 807 & 860Guo Ren-16/+22
810 doesn't support jsri instruction and csky-as will leave jsri + nop for relocation. Module-probe need replace them with lrw + jsr. Signed-off-by: Guo Ren <> Cc: Hui Kai <>
2019-01-06arch: remove redundant UAPI generic-y definesMasahiro Yamada-27/+0
Now that Kbuild automatically creates asm-generic wrappers for missing mandatory headers, it is redundant to list the same headers in generic-y and mandatory-y. Suggested-by: Sam Ravnborg <> Signed-off-by: Masahiro Yamada <> Acked-by: Sam Ravnborg <>
2019-01-05Merge tag 'csky-for-linus-4.21' of git:// Torvalds-219/+1550
Pull arch/csky updates from Guo Ren: "Here are three main features (cpu_hotplug, basic ftrace, basic perf) and some bugfixes: Features: - Add CPU-hotplug support for SMP - Add ftrace with function trace and function graph trace - Add Perf support - Add EM_CSKY_OLD 39 - optimize kernel panic print. - remove syscall_exit_work Bugfixes: - fix abiv2 mmap(... O_SYNC) failure - fix gdb coredump error - remove vdsp implement for kernel - fix qemu failure to bootup sometimes - fix ftrace call-graph panic - fix device tree node reference leak - remove meaningless header-y - fix save hi,lo,dspcr regs in switch_stack - remove unused members in processor.h" * tag 'csky-for-linus-4.21' of git:// csky: Add perf support for C-SKY csky: Add EM_CSKY_OLD 39 clocksource/drivers/c-sky: fixup ftrace call-graph panic csky: ftrace call graph supported. csky: basic ftrace supported csky: remove unused members in processor.h csky: optimize kernel panic print. csky: stacktrace supported. csky: CPU-hotplug supported for SMP clocksource/drivers/c-sky: fixup qemu fail to bootup sometimes. csky: fixup save hi,lo,dspcr regs in switch_stack. csky: remove syscall_exit_work csky: fixup remove vdsp implement for kernel. csky: bugfix gdb coredump error. csky: fixup abiv2 mmap(... O_SYNC) failed. csky: define syscall_get_arch() elf-em.h: add EM_CSKY csky: remove meaningless header-y csky: Don't leak device tree node reference
2019-01-05Merge branch 'akpm' (patches from Andrew)Linus Torvalds-1/+1
Merge more updates from Andrew Morton: - procfs updates - various misc bits - lib/ updates - epoll updates - autofs - fatfs - a few more MM bits * emailed patches from Andrew Morton <>: (58 commits) mm/page_io.c: fix polled swap page in checkpatch: add Co-developed-by to signature tags docs: fix Co-Developed-by docs drivers/base/platform.c: kmemleak ignore a known leak fs: don't open code lru_to_page() fs/: remove caller signal_pending branch predictions mm/: remove caller signal_pending branch predictions arch/arc/mm/fault.c: remove caller signal_pending_branch predictions kernel/sched/: remove caller signal_pending branch predictions kernel/locking/mutex.c: remove caller signal_pending branch predictions mm: select HAVE_MOVE_PMD on x86 for faster mremap mm: speed up mremap by 20x on large regions mm: treewide: remove unused address argument from pte_alloc functions initramfs: cleanup incomplete rootfs scripts/gdb: fix lx-version string output kernel/kcov.c: mark write_comp_data() as notrace kernel/sysctl: add panic_print into sysctl panic: add options to print system info when panic happens bfs: extra sanity checking and static inode bitmap exec: separate MM_ANONPAGES and RLIMIT_STACK accounting ...
2019-01-04fls: change parameter to unsigned intMatthew Wilcox-1/+1
When testing in userspace, UBSAN pointed out that shifting into the sign bit is undefined behaviour. It doesn't really make sense to ask for the highest set bit of a negative value, so just turn the argument type into an unsigned int. Some architectures (eg ppc) already had it declared as an unsigned int, so I don't expect too many problems. Link: Signed-off-by: Matthew Wilcox <> Acked-by: Thomas Gleixner <> Acked-by: Geert Uytterhoeven <> Cc: <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2019-01-03Remove 'type' argument from access_ok() functionLinus Torvalds-19/+11
Nobody has actually used the type (VERIFY_READ vs VERIFY_WRITE) argument of the user address range verification function since we got rid of the old racy i386-only code to walk page tables by hand. It existed because the original 80386 would not honor the write protect bit when in kernel mode, so you had to do COW by hand before doing any user access. But we haven't supported that in a long time, and these days the 'type' argument is a purely historical artifact. A discussion about extending 'user_access_begin()' to do the range checking resulted this patch, because there is no way we're going to move the old VERIFY_xyz interface to that model. And it's best done at the end of the merge window when I've done most of my merges, so let's just get this done once and for all. This patch was mostly done with a sed-script, with manual fix-ups for the cases that weren't of the trivial 'access_ok(VERIFY_xyz' form. There were a couple of notable cases: - csky still had the old "verify_area()" name as an alias. - the iter_iov code had magical hardcoded knowledge of the actual values of VERIFY_{READ,WRITE} (not that they mattered, since nothing really used it) - microblaze used the type argument for a debug printout but other than those oddities this should be a total no-op patch. I tried to fix up all architectures, did fairly extensive grepping for access_ok() uses, and the changes are trivial, but I may have missed something. Any missed conversion should be trivially fixable, though. Signed-off-by: Linus Torvalds <>
2019-01-02csky: Add perf support for C-SKYGuo Ren-1/+1054
This adds basic perf support for all C-SKY CPUs. Hardware events are only supported by 807/810/860. Signed-off-by: Guo Ren <>
2018-12-31csky: Add EM_CSKY_OLD 39Guo Ren-1/+3
C-SKY historically used 39, the same value as MCORE, from which the architecture was derived. C-SKY binutils support both EM_CSKY and EM_CSKY_OLD, confirmed by binutils:include/elf/common.h Signed-off-by: Guo Ren <>
2018-12-31csky: ftrace call graph supported.Guo Ren-20/+151
With csky-gcc -pg -mbacktrace, ftrace call graph supported. Signed-off-by: Guo Ren <>
2018-12-31csky: basic ftrace supportedGuo Ren-0/+64
When gcc with -pg, it'll add _mcount stub in every function. We need implement the _mcount in kernel and ftrace depends on stackstrace. To do: call-graph, dynamic ftrace Signed-off-by: Guo Ren <>
2018-12-31csky: remove unused members in processor.hGuo Ren-40/+0
Cleanup struct cpuinfo_csky and struct thread_struct, remove all esp0 related code. We could get pt_regs from sp and backtrace could use fp in switch_stack. Signed-off-by: Guo Ren <>
2018-12-31csky: optimize kernel panic print.Guo Ren-56/+41
Use STACKTRACE to optimize panic print more pretty and align registers printing. Signed-off-by: Guo Ren <>
2018-12-31csky: stacktrace supported.Guo Ren-12/+86
The gcc option "-mbacktrace" will push fp(r8),lr into stack and we could unwind the stack with: fp = *fp lr = (unsigned int *)fp[1] Signed-off-by: Guo Ren <>
2018-12-31csky: CPU-hotplug supported for SMPGuo Ren-15/+69
This is a simple implement of CPU-hotplug for power saving. CPU use wait instruction to enter power saving mode and waiting for IPI wakeup signal. Signed-off-by: Guo Ren <>
2018-12-31csky: fixup save hi,lo,dspcr regs in switch_stack.Guo Ren-68/+79
HI, LO, DSPCR registers are 807/810 related regs and no need for 610/860. All of the regs must be saved in pt_regs and switch_stack. This patch fixup saving dspcr reg in switch_stack and pt_regs. Signed-off-by: Guo Ren <>
2018-12-31csky: remove syscall_exit_workGuo Ren-12/+4
Remove syscall_exit_work and union all to ret_from_exception. Signed-off-by: Guo Ren <>