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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/riscv | |
| parent | 2934e3d09350c1a7ca2433fbeabfcd831e48a575 (diff) | |
| download | linux-84af21d850ee1ccc990df37dd47c13fdfe93be75.tar.gz | |
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/riscv')
| -rw-r--r-- | arch/riscv/kernel/perf_callchain.c | 13 |
1 files changed, 0 insertions, 13 deletions
diff --git a/arch/riscv/kernel/perf_callchain.c b/arch/riscv/kernel/perf_callchain.c index 8ecfc4c128bc..1fc075b8f764 100644 --- a/arch/riscv/kernel/perf_callchain.c +++ b/arch/riscv/kernel/perf_callchain.c @@ -56,13 +56,8 @@ 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; - /* RISC-V does not support perf in guest mode. */ - if (guest_cbs && guest_cbs->is_in_guest()) - return; - fp = regs->s0; perf_callchain_store(entry, regs->epc); @@ -79,13 +74,5 @@ static bool fill_callchain(void *entry, unsigned long pc) 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(); - - /* RISC-V does not support perf in guest mode. */ - if (guest_cbs && guest_cbs->is_in_guest()) { - pr_warn("RISC-V does not support perf in guest mode!"); - return; - } - walk_stackframe(NULL, regs, fill_callchain, entry); } |