diff options
| author |   Sean Christopherson <seanjc@google.com> | 2021-11-11 02:07:26 +0000 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2021-11-17 14:49:07 +0100 |
| commit | 84af21d850ee1ccc990df37dd47c13fdfe93be75 (patch) | |
| tree | de27bb3efbd80db3c75cc16ee3fdf7b4883d3652 /arch/nds32 | |
| parent | perf: Stop pretending that perf can handle multiple guest callbacks (diff) | |
| download | wireguard-linux-84af21d850ee1ccc990df37dd47c13fdfe93be75.tar.xz wireguard-linux-84af21d850ee1ccc990df37dd47c13fdfe93be75.zip | |
perf: Drop dead and useless guest "support" from arm, csky, nds32 and riscv
Drop "support" for guest callbacks from architectures that don't implement
the guest callbacks. Future patches will convert the callbacks to
static_call; rather than churn a bunch of arch code (that was presumably
copy+pasted from x86), remove it wholesale as it's useless and at best
wasting cycles.
A future patch will also add a Kconfig to force architcture to opt into
the callbacks to make it more difficult for uses "support" to sneak in in
the future.
No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Link: https://lore.kernel.org/r/20211111020738.2512932-6-seanjc@google.com
Diffstat (limited to 'arch/nds32')
| -rw-r--r-- | arch/nds32/kernel/perf_event_cpu.c | 34 |
1 files changed, 4 insertions, 30 deletions
diff --git a/arch/nds32/kernel/perf_event_cpu.c b/arch/nds32/kernel/perf_event_cpu.c index f38791960781..a78a879e7ef1 100644 --- a/arch/nds32/kernel/perf_event_cpu.c +++ b/arch/nds32/kernel/perf_event_cpu.c @@ -1363,7 +1363,6 @@ void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs(); unsigned long fp = 0; unsigned long gp = 0; unsigned long lp = 0; @@ -1372,11 +1371,6 @@ perf_callchain_user(struct perf_callchain_entry_ctx *entry, leaf_fp = 0; - if (guest_cbs && guest_cbs->is_in_guest()) { - /* We don't support guest os callchain now */ - return; - } - perf_callchain_store(entry, regs->ipc); fp = regs->fp; gp = regs->gp; @@ -1480,13 +1474,8 @@ void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs(); struct stackframe fr; - if (guest_cbs && guest_cbs->is_in_guest()) { - /* We don't support guest os callchain now */ - return; - } fr.fp = regs->fp; fr.lp = regs->lp; fr.sp = regs->sp; @@ -1495,32 +1484,17 @@ perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, unsigned long perf_instruction_pointer(struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs(); - - /* However, NDS32 does not support virtualization */ - if (guest_cbs && guest_cbs->is_in_guest()) - return guest_cbs->get_guest_ip(); - return instruction_pointer(regs); } unsigned long perf_misc_flags(struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs(); int misc = 0; - /* However, NDS32 does not support virtualization */ - if (guest_cbs && guest_cbs->is_in_guest()) { - if (guest_cbs->is_user_mode()) - misc |= PERF_RECORD_MISC_GUEST_USER; - else - misc |= PERF_RECORD_MISC_GUEST_KERNEL; - } else { - if (user_mode(regs)) - misc |= PERF_RECORD_MISC_USER; - else - misc |= PERF_RECORD_MISC_KERNEL; - } + if (user_mode(regs)) + misc |= PERF_RECORD_MISC_USER; + else + misc |= PERF_RECORD_MISC_KERNEL; return misc; } |