kernel/linux.git/arch/xtensa/include/asm/thread_info.h, branch v6.19.11

xtensa: Replace ASSEMBLY with ASSEMBLER in non-uapi headers

2025-06-06T08:03:35+00:00

While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So let's standardize on the __ASSEMBLER__ macro that is provided by the compilers now. This is a completely mechanical patch (done with a simple "sed -i" statement). Cc: Chris Zankel Cc: Max Filippov Signed-off-by: Thomas Huth Message-Id: <20250314071013.1575167-40-thuth@redhat.com> Signed-off-by: Max Filippov

arch/xtensa: always_inline get_current() and current_thread_info()

2024-07-09T22:41:10+00:00

Mark get_current() and current_thread_info() functions as always_inline to fix the following modpost warning: WARNING: modpost: vmlinux: section mismatch in reference: get_current+0xc (section: .text.unlikely) -> initcall_level_names (section: .init.data) The warning happens when these functions are called from an __init function and they don't get inlined (remain in the .text section) while the value they return points into .init.data section. Assuming get_current() always returns a valid address, this situation can happen only during init stage and accessing .init.data from .text section during that stage should pose no issues. Link: https://lkml.kernel.org/r/20240704132506.1011978-2-surenb@google.com Fixes: 22d407b164ff ("lib: add allocation tagging support for memory allocation profiling") Signed-off-by: Suren Baghdasaryan Cc: Kent Overstreet Cc: Chris Zankel Cc: Ingo Molnar Cc: Juri Lelli Cc: Max Filippov Cc: Peter Zijlstra Cc: Suren Baghdasaryan Cc: Vincent Guittot Cc: kernel test robot Signed-off-by: Andrew Morton

xtensa: improve call0 ABI probing

2022-05-17T10:35:43+00:00

When call0 userspace ABI support by probing is enabled instructions that cause illegal instruction exception when PS.WOE is clear are retried with PS.WOE set before calling c-level exception handler. Record user pc at which PS.WOE was set in the fast exception handler and clear PS.WOE in the c-level exception handler if we get there from the same address. Signed-off-by: Max Filippov

xtensa: support coprocessors on SMP

2022-05-02T02:51:23+00:00

Current coprocessor support on xtensa only works correctly on uniprocessor configurations. Make it work on SMP too and keep it lazy. Make coprocessor_owner array per-CPU and move it to struct exc_table for easy access from the fast_coprocessor exception handler. Allow task to have live coprocessors only on single CPU, record this CPU number in the struct thread_info::cp_owner_cpu. Change struct thread_info::cpenable meaning to be 'coprocessors live on cp_owner_cpu'. Introduce C-level coprocessor exception handler that flushes and releases live coprocessors of the task taking 'coprocessor disabled' exception and call it from the fast_coprocessor handler when the task has live coprocessors on other CPU. Make coprocessor_flush_all and coprocessor_release_all work correctly when called from any CPU by sending IPI to the cp_owner_cpu. Add function coprocessor_flush_release_all to do flush followed by release atomically. Add function local_coprocessors_flush_release_all to flush and release all coprocessors on the local CPU and use it to flush coprocessor contexts from the CPU that goes offline. Signed-off-by: Max Filippov

uaccess: remove CONFIG_SET_FS

2022-02-25T08:36:06+00:00

There are no remaining callers of set_fs(), so CONFIG_SET_FS can be removed globally, along with the thread_info field and any references to it. This turns access_ok() into a cheaper check against TASK_SIZE_MAX. As CONFIG_SET_FS is now gone, drop all remaining references to set_fs()/get_fs(), mm_segment_t, user_addr_max() and uaccess_kernel(). Acked-by: Sam Ravnborg # for sparc32 changes Acked-by: "Eric W. Biederman" Tested-by: Sergey Matyukevich # for arc changes Acked-by: Stafford Horne # [openrisc, asm-generic] Acked-by: Dinh Nguyen Signed-off-by: Arnd Bergmann

xtensa: add support for TIF_NOTIFY_SIGNAL

2020-11-12T15:45:56+00:00

Wire up TIF_NOTIFY_SIGNAL handling for xtensa. Thanks to Max Filippov for making the asm correct. Cc: linux-xtensa@linux-xtensa.org Signed-off-by: Jens Axboe

xtensa: add missing exclusive access state management

2020-07-31T21:15:57+00:00

The result of the s32ex opcode is recorded in the ATOMCTL special register and must be retrieved with the getex opcode. Context switch between s32ex and getex may trash the ATOMCTL register and result in duplicate update or missing update of the atomic variable. Add atomctl8 field to the struct thread_info and use getex to swap ATOMCTL bit 8 as a part of context switch. Clear exclusive access monitor on kernel entry. Cc: stable@vger.kernel.org Fixes: f7c34874f04a ("xtensa: add exclusive atomics support") Signed-off-by: Max Filippov

xtensa: add seccomp support

2020-07-28T07:57:06+00:00

Add SECCOMP to xtensa Kconfig, select HAVE_ARCH_SECCOMP_FILTER, add TIF_SECCOMP and call secure_computing from do_syscall_trace_enter. Signed-off-by: Max Filippov

xtensa: add audit support

2020-07-28T07:57:05+00:00

All bits needed for syscall audit are present on xtensa. Add audit_syscall_entry and audit_syscall_exit calls and select HAVE_ARCH_AUDITSYSCALL in Kconfig. Signed-off-by: Max Filippov

xtensa: drop unused definitions

2019-02-07T20:35:02+00:00

drop the following unused definitions: - TS_USEDFPU from arch/xtensa/include/asm/thread_info.h - current_set from arch/xtensa/kernel/process.c Signed-off-by: Max Filippov