linux/arch/nios2/kernel, branch master

nios2: ptrace: user_regset_copyin_ignore() always returns 0

2022-11-15T22:30:40Z

user_regset_copyin_ignore() always returns 0, so checking its result seems pointless -- don't do this anymore... Link: https://lkml.kernel.org/r/20221014212235.10770-8-s.shtylyov@omp.ru Signed-off-by: Sergey Shtylyov Cc: Brian Cain Cc: Catalin Marinas Cc: Christophe Leroy Cc: David S. Miller Cc: Dinh Nguyen Cc: Helge Deller Cc: James Bottomley Cc: Jonas Bonn Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Oleg Nesterov Cc: Rich Felker Cc: Russell King Cc: Stafford Horne Cc: Stefan Kristiansson Cc: Thomas Bogendoerfer Cc: Will Deacon Cc: Yoshinori Sato Signed-off-by: Andrew Morton

kbuild: use obj-y instead extra-y for objects placed at the head

2022-10-02T09:04:05Z

The objects placed at the head of vmlinux need special treatments: - arch/$(SRCARCH)/Makefile adds them to head-y in order to place them before other archives in the linker command line. - arch/$(SRCARCH)/kernel/Makefile adds them to extra-y instead of obj-y to avoid them going into built-in.a. This commit gets rid of the latter. Create vmlinux.a to collect all the objects that are unconditionally linked to vmlinux. The objects listed in head-y are moved to the head of vmlinux.a by using 'ar m'. With this, arch/$(SRCARCH)/kernel/Makefile can consistently use obj-y for builtin objects. There is no *.o that is directly linked to vmlinux. Drop unneeded code in scripts/clang-tools/gen_compile_commands.py. $(AR) mPi needs 'T' to workaround the llvm-ar bug. The fix was suggested by Nathan Chancellor [1]. [1]: https://lore.kernel.org/llvm/YyjjT5gQ2hGMH0ni@dev-arch.thelio-3990X/ Signed-off-by: Masahiro Yamada Tested-by: Nick Desaulniers Reviewed-by: Nicolas Schier

nios2: add force_successful_syscall_return()

2022-08-15T16:25:32Z

If we use the ancient SysV syscall ABI, we'd better have tell the kernel how to claim that a negative return value is a success. Use ->orig_r2 for that - it's inaccessible via ptrace, so it's a fair game for changes and it's normally[*] non-negative on return from syscall. Set to -1; syscall is not going to be restart-worthy by definition, so we won't interfere with that use either. [*] the only exception is rt_sigreturn(), where we skip the entire messing with r1/r2 anyway. Fixes: 82ed08dd1b0e ("nios2: Exception handling") Signed-off-by: Al Viro Signed-off-by: Dinh Nguyen

nios2: restarts apply only to the first sigframe we build...

2022-08-15T16:25:32Z

Fixes: b53e906d255d ("nios2: Signal handling support") Signed-off-by: Al Viro Signed-off-by: Dinh Nguyen

nios2: fix syscall restart checks

2022-08-15T16:25:32Z

sys_foo() returns -512 (aka -ERESTARTSYS) => do_signal() sees 512 in r2 and 1 in r1. sys_foo() returns 512 => do_signal() sees 512 in r2 and 0 in r1. The former is restart-worthy; the latter obviously isn't. Fixes: b53e906d255d ("nios2: Signal handling support") Signed-off-by: Al Viro Signed-off-by: Dinh Nguyen

nios2: traced syscall does need to check the syscall number

2022-08-15T16:25:32Z

all checks done before letting the tracer modify the register state are worthless... Fixes: 82ed08dd1b0e ("nios2: Exception handling") Signed-off-by: Al Viro Signed-off-by: Dinh Nguyen

nios2: don't leave NULLs in sys_call_table[]

2022-08-15T16:25:32Z

fill the gaps in there with sys_ni_syscall, as everyone does... Fixes: 82ed08dd1b0e ("nios2: Exception handling") Signed-off-by: Al Viro Signed-off-by: Dinh Nguyen

nios2: page fault et.al. are not restartable syscalls...

2022-08-15T16:25:31Z

make sure that ->orig_r2 is negative for everything except the syscalls. Fixes: 82ed08dd1b0e ("nios2: Exception handling") Signed-off-by: Al Viro Signed-off-by: Dinh Nguyen

fork: Generalize PF_IO_WORKER handling

2022-05-07T14:01:59Z

Add fn and fn_arg members into struct kernel_clone_args and test for them in copy_thread (instead of testing for PF_KTHREAD | PF_IO_WORKER). This allows any task that wants to be a user space task that only runs in kernel mode to use this functionality. The code on x86 is an exception and still retains a PF_KTHREAD test because x86 unlikely everything else handles kthreads slightly differently than user space tasks that start with a function. The functions that created tasks that start with a function have been updated to set ".fn" and ".fn_arg" instead of ".stack" and ".stack_size". These functions are fork_idle(), create_io_thread(), kernel_thread(), and user_mode_thread(). Link: https://lkml.kernel.org/r/20220506141512.516114-4-ebiederm@xmission.com Signed-off-by: "Eric W. Biederman"

fork: Pass struct kernel_clone_args into copy_thread

2022-05-07T14:01:48Z

With io_uring we have started supporting tasks that are for most purposes user space tasks that exclusively run code in kernel mode. The kernel task that exec's init and tasks that exec user mode helpers are also user mode tasks that just run kernel code until they call kernel execve. Pass kernel_clone_args into copy_thread so these oddball tasks can be supported more cleanly and easily. v2: Fix spelling of kenrel_clone_args on h8300 Link: https://lkml.kernel.org/r/20220506141512.516114-2-ebiederm@xmission.com Signed-off-by: "Eric W. Biederman"

linux/arch/nios2/kernel, branch master

nios2: ptrace: user_regset_copyin_ignore() always returns 0

kbuild: use obj-y instead extra-y for objects placed at the head

nios2: add force_successful_syscall_return()

nios2: restarts apply only to the first sigframe we build...

nios2: fix syscall restart checks

nios2: traced syscall does need to check the syscall number

nios2: don't leave NULLs in sys_call_table[]

nios2: page fault et.al. are *not* restartable syscalls...

fork: Generalize PF_IO_WORKER handling

fork: Pass struct kernel_clone_args into copy_thread

nios2: page fault et.al. are not restartable syscalls...