linux-kernel - [atishp04:sbi_pmu_v3_0day_bot 9/11] drivers/perf/riscv_pmu_sbi.c:471:20: warning: stack frame size (1344) exceeds limit (1024) in function 'pmu_sbi_ovf

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Date:   Fri, 10 Sep 2021 23:36:33 +0800
From:   kernel test robot <lkp@...el.com>
To:     Atish Patra <atish.patra@....com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Atish Patra <Atish.Patra@....com>, linux-kernel@...r.kernel.org
Subject: [atishp04:sbi_pmu_v3_0day_bot 9/11]
 drivers/perf/riscv_pmu_sbi.c:471:20: warning: stack frame size (1344)
 exceeds limit (1024) in function 'pmu_sbi_ovf_handler'

tree:   https://github.com/atishp04/linux sbi_pmu_v3_0day_bot
head:   9cf50156bc48c6cb6ee7760c14b4b1d4e804050d
commit: eeccd9f47f1980fea12c614af3dcd48c788f52c4 [9/11] RISC-V: Add interrupt support for perf
config: riscv-randconfig-r031-20210910 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 261cbe98c38f8c1ee1a482fe76511110e790f58a)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/atishp04/linux/commit/eeccd9f47f1980fea12c614af3dcd48c788f52c4
        git remote add atishp04 https://github.com/atishp04/linux
        git fetch --no-tags atishp04 sbi_pmu_v3_0day_bot
        git checkout eeccd9f47f1980fea12c614af3dcd48c788f52c4
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/perf/riscv_pmu_sbi.c:471:20: warning: stack frame size (1344) exceeds limit (1024) in function 'pmu_sbi_ovf_handler' [-Wframe-larger-than]
   static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev)
                      ^
   1 warning generated.


vim +/pmu_sbi_ovf_handler +471 drivers/perf/riscv_pmu_sbi.c

   470	
 > 471	static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev)
   472	{
   473		struct perf_sample_data data;
   474		struct pt_regs *regs;
   475		struct hw_perf_event *hw_evt;
   476		union sbi_pmu_ctr_info *info;
   477		int lidx, hidx, fidx;
   478		struct riscv_pmu *pmu;
   479		struct perf_event *event;
   480		struct cpu_hw_events *hwc = dev;
   481		unsigned long overflow = csr_read(CSR_SSCOUNTOVF);
   482		uint64_t ival[RISCV_MAX_COUNTERS] = {0};
   483	
   484		/* No overflow bit is set */
   485		if (!overflow) {
   486			csr_clear(CSR_SIP, SIP_LCOFIP);
   487			return IRQ_NONE;
   488		}
   489	
   490		fidx = find_first_bit(hwc->used_event_ctrs, RISCV_MAX_COUNTERS);
   491		event = hwc->events[fidx];
   492		if (!event) {
   493			csr_clear(CSR_SIP, SIP_LCOFIP);
   494			pr_warn("None of the counters are enabled\n");
   495			return IRQ_NONE;
   496		}
   497	
   498		pmu = to_riscv_pmu(event->pmu);
   499		pmu_sbi_stop_all(pmu);
   500	
   501		/**
   502		 * Overflow interrupt pending bit should only be cleared after stopping
   503		 * all the counters to avoid any race condition.
   504		 */
   505		regs = get_irq_regs();
   506		csr_clear(CSR_SIP, SIP_LCOFIP);
   507	
   508		for_each_set_bit(lidx, hwc->used_event_ctrs, RISCV_MAX_COUNTERS) {
   509			struct perf_event *event = hwc->events[lidx];
   510	
   511			if (!event)
   512				continue;
   513			info = &pmu_ctr_list[lidx];
   514			if (!info)
   515				continue;
   516	
   517			/* compute hardware counter index */
   518			hidx = info->csr - CSR_CYCLE;
   519			/* check if the corresponding bit is set in sscountovf */
   520			if (!(overflow & (1 << hidx)))
   521				continue;
   522	
   523			hw_evt = &event->hw;
   524			riscv_pmu_event_update(event);
   525			perf_sample_data_init(&data, 0, hw_evt->last_period);
   526			if (!riscv_pmu_event_set_period(event, &ival[lidx]))
   527				continue;
   528	
   529			/*
   530			 * Perf event overflow will queue the processing of the event as
   531			 * an irq_work which will be taken care of in the handling of
   532			 * IPI_IRQ_WORK.
   533			 */
   534			if (perf_event_overflow(event, &data, regs))
   535				pmu_sbi_ctr_stop(event, 0);
   536		}
   537		pmu_sbi_start_all(pmu, ival);
   538	
   539		return IRQ_HANDLED;
   540	}
   541	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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