diff options
Diffstat (limited to 'arch/arm64/kernel/cpu_errata.c')
| -rw-r--r-- | arch/arm64/kernel/cpu_errata.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 52f15cd896e1..8cf6b60a085a 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -60,6 +60,8 @@ static int cpu_enable_trap_ctr_access(void *__unused) return 0; } +atomic_t arm64_el2_vector_last_slot = ATOMIC_INIT(-1); + #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR #include <asm/mmu_context.h> #include <asm/cacheflush.h> @@ -90,7 +92,6 @@ static void __install_bp_hardening_cb(bp_hardening_cb_t fn, const char *hyp_vecs_start, const char *hyp_vecs_end) { - static int last_slot = -1; static DEFINE_SPINLOCK(bp_lock); int cpu, slot = -1; @@ -103,10 +104,8 @@ static void __install_bp_hardening_cb(bp_hardening_cb_t fn, } if (slot == -1) { - last_slot++; - BUG_ON(((__bp_harden_hyp_vecs_end - __bp_harden_hyp_vecs_start) - / SZ_2K) <= last_slot); - slot = last_slot; + slot = atomic_inc_return(&arm64_el2_vector_last_slot); + BUG_ON(slot >= BP_HARDEN_EL2_SLOTS); __copy_hyp_vect_bpi(slot, hyp_vecs_start, hyp_vecs_end); } |