linux-kernel - Re: drivers/platform/x86/intel/pmc/core.c:500 pmc_core_send_ltr_ignore() error: uninitialized symbol 'map'.

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Date: Sat, 2 Mar 2024 13:22:49 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: oe-kbuild@...ts.linux.dev, Xi Pardee <xi.pardee@...el.com>
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
	Rajvi Jingar <rajvi.jingar@...ux.intel.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: Re: drivers/platform/x86/intel/pmc/core.c:500
 pmc_core_send_ltr_ignore() error: uninitialized symbol 'map'.

On Sat, Mar 02, 2024 at 01:05:45PM +0300, Dan Carpenter wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   5ad3cb0ed525b80c7f66c32b49a68c1f3510bec9
> commit: 2bcef4529222424559ac9b45948ee9d82c09d9b5 platform/x86:intel/pmc: Enable debugfs multiple PMC support
> config: i386-randconfig-141-20240302 (https://download.01.org/0day-ci/archive/20240302/202403021544.6qtkaAly-lkp@intel.com/config)
> compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> | Closes: https://lore.kernel.org/r/202403021544.6qtkaAly-lkp@intel.com/
> 
> New smatch warnings:
> drivers/platform/x86/intel/pmc/core.c:500 pmc_core_send_ltr_ignore() error: uninitialized symbol 'map'.
> 
> Old smatch warnings:
> drivers/platform/x86/intel/pmc/core.c:500 pmc_core_send_ltr_ignore() error: uninitialized symbol 'pmc'.
> 
> vim +/map +500 drivers/platform/x86/intel/pmc/core.c
> 
> 92f530edd7c955 drivers/platform/x86/intel/pmc/core.c Gayatri Kammela   2022-11-14  463  int pmc_core_send_ltr_ignore(struct pmc_dev *pmcdev, u32 value)
> 9c2ee19987ef02 drivers/platform/x86/intel_pmc_core.c Rajneesh Bhardwaj 2016-10-07  464  {
> 2bcef452922242 drivers/platform/x86/intel/pmc/core.c Xi Pardee         2023-06-13  465  	struct pmc *pmc;
> 2bcef452922242 drivers/platform/x86/intel/pmc/core.c Xi Pardee         2023-06-13  466  	const struct pmc_reg_map *map;
> 36974daf53888e drivers/platform/x86/intel_pmc_core.c David E. Box      2021-03-19  467  	u32 reg;
> 2bcef452922242 drivers/platform/x86/intel/pmc/core.c Xi Pardee         2023-06-13  468  	int pmc_index, ltr_index;
> 9592438886756c drivers/platform/x86/intel_pmc_core.c Andy Shevchenko   2019-12-18  469  
> 2bcef452922242 drivers/platform/x86/intel/pmc/core.c Xi Pardee         2023-06-13  470  	ltr_index = value;
> 2bcef452922242 drivers/platform/x86/intel/pmc/core.c Xi Pardee         2023-06-13  471  	/* For platforms with multiple pmcs, ltr index value given by user
> 2bcef452922242 drivers/platform/x86/intel/pmc/core.c Xi Pardee         2023-06-13  472  	 * is based on the contiguous indexes from ltr_show output.
> 2bcef452922242 drivers/platform/x86/intel/pmc/core.c Xi Pardee         2023-06-13  473  	 * pmc index and ltr index needs to be calculated from it.
> 2bcef452922242 drivers/platform/x86/intel/pmc/core.c Xi Pardee         2023-06-13  474  	 */
> 2bcef452922242 drivers/platform/x86/intel/pmc/core.c Xi Pardee         2023-06-13  475  	for (pmc_index = 0; pmc_index < ARRAY_SIZE(pmcdev->pmcs) && ltr_index > 0; pmc_index++) {
> 
> 
> ltr_index comes from the user via pmc_core_ltr_ignore_write()  Assume
> that it is zero.

Never mind.  This was fixed in fbcf67ce5a9e ("platform/x86/intel/pmc:
Fix hang in pmc_core_send_ltr_ignore()").

regards,
dan carpenter