Charlie Jenkins 7c1e5b9690 riscv: Disable preemption while handling PR_RISCV_CTX_SW_FENCEI_OFF ... The icache will be flushed in switch_to() if force_icache_flush is true, or in flush_icache_deferred() if icache_stale_mask is set. Between setting force_icache_flush to false and calculating the new icache_stale_mask, preemption needs to be disabled. There are two reasons for this: 1. If CPU migration happens between force_icache_flush = false, and the icache_stale_mask is set, an icache flush will not be emitted. 2. smp_processor_id() is used in set_icache_stale_mask() to mark the current CPU as not needing another flush since a flush will have happened either by userspace or by the kernel when performing the migration. smp_processor_id() is currently called twice with preemption enabled which causes a race condition. It allows icache_stale_mask to be populated with inconsistent CPU ids. Resolve these two issues by setting the icache_stale_mask before setting force_icache_flush to false, and using get_cpu()/put_cpu() to obtain the smp_processor_id(). Signed-off-by: Charlie Jenkins <charlie@rivosinc.com> Fixes: 6b9391b581 ("riscv: Include riscv_set_icache_flush_ctx prctl") Link: https://lore.kernel.org/r/20240903-fix_fencei_optimization-v2-1-8025f20171fc@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>		2024-09-10 20:38:46 -07:00
..
boot	RISC-V Patches for the 6.11 Merge Window, Part 2	2024-07-27 10:14:34 -07:00
configs	RISC-V: run savedefconfig for defconfig	2024-07-22 10:57:47 -07:00
crypto	crypto: riscv - add vector crypto accelerated AES-CBC-CTS	2024-03-20 08:56:11 -07:00
errata	riscv: Extend cpufeature.c to detect vendor extensions	2024-07-22 15:36:54 -07:00
include	riscv: Fix RISCV_ALTERNATIVE_EARLY	2024-09-03 07:57:55 -07:00
kernel	riscv: Fix RISCV_ALTERNATIVE_EARLY	2024-09-03 07:57:55 -07:00
kvm	ARM:	2024-07-20 12:41:03 -07:00
lib	riscv: Optimize crc32 with Zbc extension	2024-07-10 13:19:50 -07:00
mm	riscv: Disable preemption while handling PR_RISCV_CTX_SW_FENCEI_OFF	2024-09-10 20:38:46 -07:00
net	RISC-V Patches for the 6.11 Merge Window, Part 1	2024-07-20 09:11:27 -07:00
purgatory	riscv/purgatory: align riscv_kernel_entry	2024-08-01 07:14:34 -07:00
tools	riscv: Check relocations at compile time	2023-04-19 07:46:32 -07:00
Kbuild	RISC-V: hook new crypto subdir into build-system	2024-01-22 17:55:17 -08:00
Kconfig	riscv: Fix toolchain vector detection	2024-09-03 07:57:05 -07:00
Kconfig.debug	riscv: Add tests for riscv module loading	2023-11-07 14:59:32 -08:00
Kconfig.errata	riscv: thead: Rename T-Head PBMT to MAE	2024-04-25 10:22:33 -07:00
Kconfig.socs	RISC-V: drop SOC_VIRT for ARCH_VIRT	2024-04-10 11:37:50 +01:00
Kconfig.vendor	riscv: Extend cpufeature.c to detect vendor extensions	2024-07-22 15:36:54 -07:00
Makefile	Merge patch series "riscv: Apply Zawrs when available"	2024-07-12 08:55:29 -07:00
Makefile.postlink	kbuild: remove ARCH_POSTLINK from module builds	2023-10-28 21:10:08 +09:00