[PATCH v3 3/9] ARM: bugs: Check in the vtable instead of defined aliases
From: Linus Walleij <hidden>
Date: 2024-03-11 09:16:16
Also in:
llvm
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Instead of checking if cpu_check_bugs() exist, check for this callback directly in the CPU vtable: this is better because the function is just a define to the vtable entry and this is why the code works. But we want to be able to specify a proper function for cpu_check_bugs() so look into the vtable instead. In bugs.c assign PROC_VTABLE(switch_mm) instead of assigning cpu_do_switch_mm where again this is just a define into the vtable: this makes it possible to make cpu_do_switch_mm() into a real function. Signed-off-by: Linus Walleij <redacted> --- arch/arm/kernel/bugs.c | 2 +- arch/arm/mm/proc-v7-bugs.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/arm/kernel/bugs.c b/arch/arm/kernel/bugs.c
index 087bce6ec8e9..35d39efb51ed 100644
--- a/arch/arm/kernel/bugs.c
+++ b/arch/arm/kernel/bugs.c@@ -7,7 +7,7 @@ void check_other_bugs(void) { #ifdef MULTI_CPU - if (cpu_check_bugs) + if (PROC_VTABLE(check_bugs)) cpu_check_bugs(); #endif }
diff --git a/arch/arm/mm/proc-v7-bugs.c b/arch/arm/mm/proc-v7-bugs.c
index 8bc7a2d6d6c7..ea3ee2bd7b56 100644
--- a/arch/arm/mm/proc-v7-bugs.c
+++ b/arch/arm/mm/proc-v7-bugs.c@@ -87,14 +87,14 @@ static unsigned int spectre_v2_install_workaround(unsigned int method) case SPECTRE_V2_METHOD_HVC: per_cpu(harden_branch_predictor_fn, cpu) = call_hvc_arch_workaround_1; - cpu_do_switch_mm = cpu_v7_hvc_switch_mm; + PROC_VTABLE(switch_mm) = cpu_v7_hvc_switch_mm; spectre_v2_method = "hypervisor"; break; case SPECTRE_V2_METHOD_SMC: per_cpu(harden_branch_predictor_fn, cpu) = call_smc_arch_workaround_1; - cpu_do_switch_mm = cpu_v7_smc_switch_mm; + PROC_VTABLE(switch_mm) = cpu_v7_smc_switch_mm; spectre_v2_method = "firmware"; break; }
--
2.34.1
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