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| 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/csky/kernel/perf_callchain.c | |
| parent | 2934e3d09350c1a7ca2433fbeabfcd831e48a575 (diff) | |
| download | linux-84af21d850ee1ccc990df37dd47c13fdfe93be75.tar.gz linux-84af21d850ee1ccc990df37dd47c13fdfe93be75.tar.bz2 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/csky/kernel/perf_callchain.c')
| -rw-r--r-- | arch/csky/kernel/perf_callchain.c | 12 |
1 files changed, 0 insertions, 12 deletions
diff --git a/arch/csky/kernel/perf_callchain.c b/arch/csky/kernel/perf_callchain.c index 35318a635a5f..92057de08f4f 100644 --- a/arch/csky/kernel/perf_callchain.c +++ b/arch/csky/kernel/perf_callchain.c @@ -86,13 +86,8 @@ static unsigned long user_backtrace(struct perf_callchain_entry_ctx *entry, 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; - /* C-SKY does not support virtualization. */ - if (guest_cbs && guest_cbs->is_in_guest()) - return; - fp = regs->regs[4]; perf_callchain_store(entry, regs->pc); @@ -111,15 +106,8 @@ void perf_callchain_user(struct perf_callchain_entry_ctx *entry, 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; - /* C-SKY does not support virtualization. */ - if (guest_cbs && guest_cbs->is_in_guest()) { - pr_warn("C-SKY does not support perf in guest mode!"); - return; - } - fr.fp = regs->regs[4]; fr.lr = regs->lr; walk_stackframe(&fr, entry); |