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a370c2419e
mirror_ubuntu-kernels/arch/riscv/kernel
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Alexandre Ghiti a370c2419e
riscv: Disable preemption when using patch_map() 
patch_map() uses fixmap mappings to circumvent the non-writability of
the kernel text mapping.

The __set_fixmap() function only flushes the current cpu tlb, it does
not emit an IPI so we must make sure that while we use a fixmap mapping,
the current task is not migrated on another cpu which could miss the
newly introduced fixmap mapping.

So in order to avoid any task migration, disable the preemption.

Reported-by: Andrea Parri <andrea@rivosinc.com>
Closes: https://lore.kernel.org/all/ZcS+GAaM25LXsBOl@andrea/
Reported-by: Andy Chiu <andy.chiu@sifive.com>
Closes: https://lore.kernel.org/linux-riscv/CABgGipUMz3Sffu-CkmeUB1dKVwVQ73+7=sgC45-m0AE9RCjOZg@mail.gmail.com/
Fixes: cad539baa4 ("riscv: implement a memset like function for text")
Fixes: 0ff7c3b331 ("riscv: Use text_mutex instead of patch_lock")
Co-developed-by: Andy Chiu <andy.chiu@sifive.com>
Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Acked-by: Puranjay Mohan <puranjay12@gmail.com>
Link: https://lore.kernel.org/r/20240326203017.310422-3-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2024-04-04 12:33:38 -07:00
..
compat_vdso riscv: compat_vdso: align VDSOAS build log 2024-03-27 07:08:38 -07:00
pi RISC-V: build: Allow LTO to be selected 2024-01-22 10:06:29 -08:00
probes riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
tests treewide: replace or remove redundant def_bool in Kconfig files 2024-02-20 20:47:45 +09:00
vdso riscv: hwprobe: do not produce frtace relocation 2024-03-26 14:06:59 -07:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
acpi.c RISC-V: ACPI: Enhance acpi_os_ioremap with MMIO remapping 2023-10-26 09:40:31 -07:00
alternative.c riscv: errata: Rename defines for Andes 2024-03-12 07:13:12 -07:00
asm-offsets.c riscv: Implement Shadow Call Stack 2023-10-27 14:43:08 -07:00
cacheinfo.c RISC-V Patches for the 6.4 Merge Window, Part 1 2023-04-28 16:55:39 -07:00
cfi.c bpf, riscv64/cfi: Support kCFI + BPF on riscv64 2024-03-06 15:18:16 -08:00
compat_signal.c riscv: compat: signal: Add rt_frame implementation 2022-05-17 16:37:21 -07:00
compat_syscall_table.c riscv: Implement syscall wrappers 2023-08-23 14:16:36 -07:00
copy-unaligned.h RISC-V: Probe for unaligned access speed 2023-09-01 09:06:25 -07:00
copy-unaligned.S riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
cpu_ops_sbi.c riscv: Remove unused members from struct cpu_operations 2024-01-04 15:03:06 -08:00
cpu_ops_spinwait.c riscv: Remove unused members from struct cpu_operations 2024-01-04 15:03:06 -08:00
cpu_ops.c riscv: Use the same CPU operations for all CPUs 2024-01-04 15:03:07 -08:00
cpu-hotplug.c riscv: Use the same CPU operations for all CPUs 2024-01-04 15:03:07 -08:00
cpu.c Merge patch series "Linux RISC-V AIA Preparatory Series" 2023-11-08 18:57:17 -08:00
cpufeature.c RISC-V Patches for the 6.9 Merge Window 2024-03-22 10:41:13 -07:00
crash_dump.c vmcore: convert copy_oldmem_page() to take an iov_iter 2022-04-29 14:37:59 -07:00
crash_save_regs.S RISC-V: Fixup get incorrect user mode PC for kernel mode regs 2022-08-11 08:54:40 -07:00
efi-header.S riscv: Prepare EFI header for relocatable kernels 2023-04-19 07:46:28 -07:00
efi.c riscv: Use accessors to page table entries instead of direct dereference 2023-12-20 10:48:15 -08:00
elf_kexec.c riscv, crash: wrap crash dumping code into crash related ifdefs 2024-02-23 17:48:24 -08:00
entry.S riscv: blacklist assembly symbols for kprobe 2024-01-24 15:59:42 -08:00
fpu.S riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
ftrace.c riscv: ftrace: Make function graph use ftrace directly 2024-01-17 18:17:08 -08:00
head.h riscv: entry: Convert to generic entry 2023-03-23 08:47:00 -07:00
head.S Merge patch series "Fix XIP boot and make XIP testable in QEMU" 2024-01-09 20:10:39 -08:00
hibernate-asm.S riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
hibernate.c riscv: hibernate: remove WARN_ON in save_processor_state 2023-06-23 10:06:22 -07:00
image-vars.h efi: move screen_info into efi init code 2023-10-17 16:33:39 +02:00
irq.c Merge patch "drivers: perf: Do not broadcast to other cpus when starting a counter" 2023-11-09 06:44:13 -08:00
jump_label.c jump_label: make initial NOP patching the special case 2022-06-24 09:48:55 +02:00
kernel_mode_vector.c riscv: vector: allow kernel-mode Vector with preemption 2024-01-16 07:14:02 -08:00
kexec_relocate.S riscv: kexec: Cleanup riscv_kexec_relocate 2023-09-20 02:53:29 -07:00
kgdb.c RISC-V: rename parse_asm.h to insn.h 2022-12-29 06:59:47 -08:00
machine_kexec_file.c RISC-V: Add kexec_file support 2022-05-19 12:14:18 -07:00
machine_kexec.c kexec_file, riscv: print out debugging message if required 2023-12-20 15:02:57 -08:00
Makefile RISC-V Patches for the 6.9 Merge Window 2024-03-22 10:41:13 -07:00
mcount-dyn.S Merge patch series "riscv: ftrace: Miscellaneous ftrace improvements" 2024-01-17 18:17:29 -08:00
mcount.S riscv: remove MCOUNT_NAME workaround 2024-02-22 15:38:54 -08:00
module-sections.c riscv: add missing header file includes 2019-10-28 00:46:01 -07:00
module.c riscv: optimize ELF relocation function in riscv 2024-01-17 18:21:10 -08:00
paravirt.c RISC-V: paravirt: Use correct restricted types 2024-02-09 11:53:10 +05:30
patch.c riscv: Disable preemption when using patch_map() 2024-04-04 12:33:38 -07:00
perf_callchain.c riscv: Fix fill_callchain return value 2022-03-30 23:01:42 -07:00
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
process.c riscv: Fix warning by declaring arch_cpu_idle() as noinstr 2024-04-04 12:33:37 -07:00
ptrace.c Merge patch series "riscv: Introduce compat-mode helpers & improve arch_get_mmap_end()" 2024-03-20 08:56:05 -07:00
reset.c riscv: Use do_kernel_power_off() 2022-05-19 19:30:30 +02:00
return_address.c riscv: add CALLER_ADDRx support 2024-02-22 12:17:47 -08:00
riscv_ksyms.c RISC-V: add infrastructure to allow different str* implementations 2023-01-31 11:43:23 -08:00
sbi-ipi.c RISC-V: Allow marking IPIs as suitable for remote FENCEs 2023-04-08 11:26:24 +01:00
sbi.c RISC-V: Add SBI debug console helper routines 2024-01-10 07:04:03 -08:00
setup.c Driver core changes for 6.8-rc1 2024-01-18 09:48:40 -08:00
signal.c riscv: Fix vector state restore in rt_sigreturn() 2024-04-03 16:10:25 -07:00
smp.c riscv: Use the same CPU operations for all CPUs 2024-01-04 15:03:07 -08:00
smpboot.c RISC-V Patches for the 6.9 Merge Window 2024-03-22 10:41:13 -07:00
soc.c riscv: Fix builtin DTB handling 2021-01-07 19:00:50 -08:00
stacktrace.c riscv: Use READ_ONCE_NOCHECK in imprecise unwinding stack mode 2023-03-09 14:50:35 -08:00
suspend_entry.S riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
suspend.c RISC-V Patches for the 6.9 Merge Window 2024-03-22 10:41:13 -07:00
sys_hwprobe.c riscv: Set unaligned access speed at compile time 2024-03-13 07:30:31 -07:00
sys_riscv.c riscv: hwprobe: export Zicond extension 2024-01-09 20:12:30 -08:00
syscall_table.c riscv: Implement syscall wrappers 2023-08-23 14:16:36 -07:00
time.c RISC-V: paravirt: Add skeleton for pv-time support 2023-12-30 11:25:03 +05:30
traps_misaligned.c riscv: Set unaligned access speed at compile time 2024-03-13 07:30:31 -07:00
traps.c riscv: use KERN_INFO in do_trap 2024-04-04 12:12:14 -07:00
unaligned_access_speed.c riscv: Use kcalloc() instead of kzalloc() 2024-03-20 08:56:07 -07:00
vdso.c riscv: vdso: Use generic union vdso_data_store 2024-02-20 20:56:00 +01:00
vector.c riscv: vector: allow kernel-mode Vector with preemption 2024-01-16 07:14:02 -08:00
vmcore_info.c crash: split vmcoreinfo exporting code out from crash_core.c 2024-02-23 17:48:22 -08:00
vmlinux-xip.lds.S riscv: Check if the code to patch lies in the exit section 2024-01-09 10:58:59 -08:00
vmlinux.lds.S riscv: Check if the code to patch lies in the exit section 2024-01-09 10:58:59 -08:00