[PATCH 1/2] powerpc/kexec_file: fix extra size calculation for kexec FDT

[kernel test robot]

Hi Sourabh,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20240508]
[cannot apply to powerpc/next powerpc/fixes linus/master v6.9-rc7 v6.9-rc6 v6.9-rc5 v6.9-rc7]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Sourabh-Jain/powerpc-kexec_file-fix-extra-size-calculation-for-kexec-FDT/20240508-211003
base:   next-20240508
patch link:    https://lore.kernel.org/r/20240508130558.1939304-2-sourabhjain%40linux.ibm.com
patch subject: [PATCH 1/2] powerpc/kexec_file: fix extra size calculation for kexec FDT
config: powerpc64-randconfig-002-20240509 (https://download.01.org/0day-ci/archive/20240509/202405091617.IRRnTyRE-lkp@intel.com/config)
compiler: powerpc64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240509/202405091617.IRRnTyRE-lkp@intel.com/reproduce)

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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405091617.IRRnTyRE-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/powerpc/kexec/file_load_64.c:852: warning: Function parameter or struct member 'rmem' not described in 'kexec_extra_fdt_size_ppc64'


vim +852 arch/powerpc/kexec/file_load_64.c

2377c92e37fe97 Hari Bathini 2021-02-04  843  
33f2cc0a2e90f7 Hari Bathini 2024-02-26  844  /**
33f2cc0a2e90f7 Hari Bathini 2024-02-26  845   * kexec_extra_fdt_size_ppc64 - Return the estimated additional size needed to
33f2cc0a2e90f7 Hari Bathini 2024-02-26  846   *                              setup FDT for kexec/kdump kernel.
33f2cc0a2e90f7 Hari Bathini 2024-02-26  847   * @image:                      kexec image being loaded.
33f2cc0a2e90f7 Hari Bathini 2024-02-26  848   *
33f2cc0a2e90f7 Hari Bathini 2024-02-26  849   * Returns the estimated extra size needed for kexec/kdump kernel FDT.
33f2cc0a2e90f7 Hari Bathini 2024-02-26  850   */
f2c160891d3206 Sourabh Jain 2024-05-08  851  unsigned int kexec_extra_fdt_size_ppc64(struct kimage *image, struct crash_mem *rmem)
33f2cc0a2e90f7 Hari Bathini 2024-02-26 @852  {
f2c160891d3206 Sourabh Jain 2024-05-08  853  	struct device_node *dn;
f2c160891d3206 Sourabh Jain 2024-05-08  854  	unsigned int cpu_nodes, extra_size = 0;
33f2cc0a2e90f7 Hari Bathini 2024-02-26  855  
33f2cc0a2e90f7 Hari Bathini 2024-02-26  856  	// Budget some space for the password blob. There's already extra space
33f2cc0a2e90f7 Hari Bathini 2024-02-26  857  	// for the key name
33f2cc0a2e90f7 Hari Bathini 2024-02-26  858  	if (plpks_is_available())
33f2cc0a2e90f7 Hari Bathini 2024-02-26  859  		extra_size += (unsigned int)plpks_get_passwordlen();
33f2cc0a2e90f7 Hari Bathini 2024-02-26  860  
f2c160891d3206 Sourabh Jain 2024-05-08  861  	/* Get the number of CPU nodes in the current device tree */
f2c160891d3206 Sourabh Jain 2024-05-08  862  	for_each_node_by_type(dn, "cpu") {
f2c160891d3206 Sourabh Jain 2024-05-08  863  		cpu_nodes++;
f2c160891d3206 Sourabh Jain 2024-05-08  864  	}
f2c160891d3206 Sourabh Jain 2024-05-08  865  
f2c160891d3206 Sourabh Jain 2024-05-08  866  	/* Consider extra space for CPU nodes added since the boot time */
f2c160891d3206 Sourabh Jain 2024-05-08  867  	if (cpu_nodes > boot_cpu_node_count)
f2c160891d3206 Sourabh Jain 2024-05-08  868  		extra_size += (cpu_nodes - boot_cpu_node_count) * cpu_node_size();
f2c160891d3206 Sourabh Jain 2024-05-08  869  
f2c160891d3206 Sourabh Jain 2024-05-08  870  	/* Consider extra space for reserved memory ranges if any */
f2c160891d3206 Sourabh Jain 2024-05-08  871  	if (rmem->nr_ranges > 0)
f2c160891d3206 Sourabh Jain 2024-05-08  872  		extra_size += sizeof(struct fdt_reserve_entry) * rmem->nr_ranges;
f2c160891d3206 Sourabh Jain 2024-05-08  873  
f2c160891d3206 Sourabh Jain 2024-05-08  874  	return extra_size + kdump_extra_fdt_size_ppc64(image, cpu_nodes);
33f2cc0a2e90f7 Hari Bathini 2024-02-26  875  }
33f2cc0a2e90f7 Hari Bathini 2024-02-26  876  

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