kernel/linux.git/arch/openrisc, branch v5.10.257

openrisc: define arch-specific version of nop()

2026-03-04T12:20:01+00:00

[ Upstream commit 0dfffa5479d6260d04d021f69203b1926f73d889 ] When compiling a driver written for MIPS on OpenRISC that uses the nop() function, it fails due to the following error: drivers/watchdog/pic32-wdt.c: Assembler messages: drivers/watchdog/pic32-wdt.c:125: Error: unrecognized instruction `nop' The driver currently uses the generic version of nop() from include/asm-generic/barrier.h: #ifndef nop #define nop() asm volatile ("nop") #endif Let's fix this on OpenRISC by defining an architecture-specific version of nop(). This was tested by performing an allmodconfig openrisc cross compile on an aarch64 host. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202601180236.BVy480We-lkp@intel.com/ Signed-off-by: Brian Masney Signed-off-by: Stafford Horne Signed-off-by: Sasha Levin

openrisc: Call setup_memory() earlier in the init sequence

2024-09-04T11:17:38+00:00

[ Upstream commit 7b432bf376c9c198a7ff48f1ed14a14c0ffbe1fe ] The unflatten_and_copy_device_tree() function contains a call to memblock_alloc(). This means that memblock is allocating memory before any of the reserved memory regions are set aside in the setup_memory() function which calls early_init_fdt_scan_reserved_mem(). Therefore, there is a possibility for memblock to allocate from any of the reserved memory regions. Hence, move the call to setup_memory() to be earlier in the init sequence so that the reserved memory regions are set aside before any allocations are done using memblock. Signed-off-by: Oreoluwa Babatunde Signed-off-by: Stafford Horne Signed-off-by: Sasha Levin

openrisc: Properly store r31 to pt_regs on unhandled exceptions

2023-05-17T09:48:03+00:00

[ Upstream commit 812489ac4dd91144a74ce65ecf232252a2e406fb ] In commit 91993c8c2ed5 ("openrisc: use shadow registers to save regs on exception") the unhandled exception path was changed to do an early store of r30 instead of r31. The entry code was not updated and r31 is not getting stored to pt_regs. This patch updates the entry handler to store r31 instead of r30. We also remove some misleading commented out store r30 and r31 instructrions. I noticed this while working on adding floating point exception handling, This issue probably would never impact anything since we kill the process or Oops right away on unhandled exceptions. Fixes: 91993c8c2ed5 ("openrisc: use shadow registers to save regs on exception") Signed-off-by: Stafford Horne Signed-off-by: Sasha Levin

exit: Add and use make_task_dead.

2023-02-01T07:23:19+00:00

commit 0e25498f8cd43c1b5aa327f373dd094e9a006da7 upstream. There are two big uses of do_exit. The first is it's design use to be the guts of the exit(2) system call. The second use is to terminate a task after something catastrophic has happened like a NULL pointer in kernel code. Add a function make_task_dead that is initialy exactly the same as do_exit to cover the cases where do_exit is called to handle catastrophic failure. In time this can probably be reduced to just a light wrapper around do_task_dead. For now keep it exactly the same so that there will be no behavioral differences introducing this new concept. Replace all of the uses of do_exit that use it for catastraphic task cleanup with make_task_dead to make it clear what the code is doing. As part of this rename rewind_stack_do_exit rewind_stack_and_make_dead. Signed-off-by: "Eric W. Biederman" Signed-off-by: Eric Biggers Signed-off-by: Sasha Levin

arch: setup PF_IO_WORKER threads like PF_KTHREAD

2023-01-04T10:39:22+00:00

[ Upstream commit 4727dc20e0422211a0e0c72b1ace4ed6096df8a6 ] PF_IO_WORKER are kernel threads too, but they aren't PF_KTHREAD in the sense that we don't assign ->set_child_tid with our own structure. Just ensure that every arch sets up the PF_IO_WORKER threads like kthreads in the arch implementation of copy_thread(). Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman

openrisc: add support for TIF_NOTIFY_SIGNAL

2023-01-04T10:39:20+00:00

[ Upstream commit e181c0aa2e532af2b17128fbde699f8578cc0562 ] Wire up TIF_NOTIFY_SIGNAL handling for openrisc. Cc: openrisc@lists.librecores.org Acked-by: Stafford Horne Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman

openrisc: start CPU timer early in boot

2022-06-09T08:20:55+00:00

[ Upstream commit 516dd4aacd67a0f27da94f3fe63fe0f4dbab6e2b ] In order to measure the boot process, the timer should be switched on as early in boot as possible. As well, the commit defines the get_cycles macro, like the previous patches in this series, so that generic code is aware that it's implemented by the platform, as is done on other archs. Cc: Thomas Gleixner Cc: Arnd Bergmann Cc: Jonas Bonn Cc: Stefan Kristiansson Acked-by: Stafford Horne Reported-by: Guenter Roeck Signed-off-by: Jason A. Donenfeld Signed-off-by: Sasha Levin

openrisc: Add clone3 ABI wrapper

2022-01-27T09:54:06+00:00

[ Upstream commit 433fe39f674d58bc7a3e8254a5d2ffc290b7e04e ] Like fork and clone the clone3 syscall needs a wrapper to save callee saved registers, which is required by the OpenRISC ABI. This came up after auditing code following a discussion with Rob Landley and Arnd Bergmann [0]. Tested with the clone3 kselftests and there were no issues. [0] https://lore.kernel.org/all/41206fc7-f8ce-98aa-3718-ba3e1431e320@landley.net/T/#m9c0cdb2703813b9df4da04cf6b30de1f1aa89944 Fixes: 07e83dfbe16c ("openrisc: Enable the clone3 syscall") Cc: Rob Landley Cc: Arnd Bergmann Signed-off-by: Stafford Horne Signed-off-by: Sasha Levin

openrisc: fix SMP tlb flush NULL pointer dereference

2021-11-18T13:04:25+00:00

[ Upstream commit 27dff9a9c247d4e38d82c2e7234914cfe8499294 ] Throughout the OpenRISC kernel port VMA is passed as NULL when flushing kernel tlb entries. Somehow this was missed when I was testing c28b27416da9 ("openrisc: Implement proper SMP tlb flushing") and now the SMP kernel fails to completely boot. In OpenRISC VMA is used only to determine which cores need to have their TLB entries flushed. This patch updates the logic to flush tlbs on all cores when the VMA is passed as NULL. Also, we update places VMA is passed as NULL to use flush_tlb_kernel_range instead. Now, the only place VMA is passed as NULL is in the implementation of flush_tlb_kernel_range. Fixes: c28b27416da9 ("openrisc: Implement proper SMP tlb flushing") Reported-by: Jan Henrik Weinstock Signed-off-by: Stafford Horne Signed-off-by: Sasha Levin

openrisc: don't printk() unconditionally

2021-09-18T11:40:13+00:00

[ Upstream commit 946e1052cdcc7e585ee5d1e72528ca49fb295243 ] Don't call printk() when CONFIG_PRINTK is not set. Fixes the following build errors: or1k-linux-ld: arch/openrisc/kernel/entry.o: in function `_external_irq_handler': (.text+0x804): undefined reference to `printk' (.text+0x804): relocation truncated to fit: R_OR1K_INSN_REL_26 against undefined symbol `printk' Fixes: 9d02a4283e9c ("OpenRISC: Boot code") Signed-off-by: Randy Dunlap Reported-by: kernel test robot Cc: Jonas Bonn Cc: Stefan Kristiansson Cc: Stafford Horne Cc: openrisc@lists.librecores.org Signed-off-by: Stafford Horne Signed-off-by: Sasha Levin