Merge tag 'perf-urgent-2020-11-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip (64b609d6) · Commits · 戴 / test

Pull perf fixes from Thomas Gleixner: "A set of fixes for perf: - A set of commits which reduce the stack usage of various perf event handling functions which allocated large data structs on stack causing stack overflows in the worst case - Use the proper mechanism for detecting soft interrupts in the recursion protection - Make the resursion protection simpler and more robust - Simplify the scheduling of event groups to make the code more robust and prepare for fixing the issues vs. scheduling of exclusive event groups - Prevent event multiplexing and rotation for exclusive event groups - Correct the perf event attribute exclusive semantics to take pinned events, e.g. the PMU watchdog, into account - Make the anythread filtering conditional for Intel's generic PMU counters as it is not longer guaranteed to be supported on newer CPUs. Check the corresponding CPUID leaf to make sure - Fixup a duplicate initialization in an array which was probably caused by the usual 'copy & paste - forgot to edit' mishap" * tag 'perf-urgent-2020-11-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/x86/intel/uncore: Fix Add BW copypasta perf/x86/intel: Make anythread filter support conditional perf: Tweak perf_event_attr::exclusive semantics perf: Fix event multiplexing for exclusive groups perf: Simplify group_sched_in() perf: Simplify group_sched_out() perf/x86: Make dummy_iregs static perf/arch: Remove perf_sample_data::regs_user_copy perf: Optimize get_recursion_context() perf: Fix get_recursion_context() perf/x86: Reduce stack usage for x86_pmu::drain_pebs() perf: Reduce stack usage of perf_output_begin()

arch/arm/kernel/perf_regs.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -32,8 +32,7 @@ u64 perf_reg_abi(struct task_struct *task)
		}

		void perf_get_regs_user(struct perf_regs *regs_user,
		struct pt_regs *regs,
		struct pt_regs *regs_user_copy)
		struct pt_regs *regs)
		{
		regs_user->regs = task_pt_regs(current);
		regs_user->abi = perf_reg_abi(current);

arch/arm64/kernel/perf_regs.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -73,8 +73,7 @@ u64 perf_reg_abi(struct task_struct *task)
		}

		void perf_get_regs_user(struct perf_regs *regs_user,
		struct pt_regs *regs,
		struct pt_regs *regs_user_copy)
		struct pt_regs *regs)
		{
		regs_user->regs = task_pt_regs(current);
		regs_user->abi = perf_reg_abi(current);

arch/csky/kernel/perf_regs.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -32,8 +32,7 @@ u64 perf_reg_abi(struct task_struct *task)
		}

		void perf_get_regs_user(struct perf_regs *regs_user,
		struct pt_regs *regs,
		struct pt_regs *regs_user_copy)
		struct pt_regs *regs)
		{
		regs_user->regs = task_pt_regs(current);
		regs_user->abi = perf_reg_abi(current);

arch/powerpc/perf/imc-pmu.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1336,7 +1336,7 @@ static void dump_trace_imc_data(struct perf_event *event)
		/* If this is a valid record, create the sample */
		struct perf_output_handle handle;

		if (perf_output_begin(&handle, event, header.size))
		if (perf_output_begin(&handle, &data, event, header.size))
		return;

		perf_output_sample(&handle, &header, &data, event);

arch/powerpc/perf/perf_regs.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -144,8 +144,7 @@ u64 perf_reg_abi(struct task_struct *task)
		}

		void perf_get_regs_user(struct perf_regs *regs_user,
		struct pt_regs *regs,
		struct pt_regs *regs_user_copy)
		struct pt_regs *regs)
		{
		regs_user->regs = task_pt_regs(current);
		regs_user->abi = (regs_user->regs) ? perf_reg_abi(current) :

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