A Case to Solve Memroy Leak bug

近期Imgsrc一处内存泄露问题的查找和解决

This is a very interesting case to resolve a memory leak issue in ImageMagick library.

How "mtdparts=" Kernel Command Line Work in Nexus One

I am just wondering how it works.
And...source code is your answers.

I clone kernel source from cm-kernel
https://github.com/CyanogenMod/cm-kernel.git
branch: android-msm-2.6.37

1. arch/arm/mach-msm/nand_partitions.c:
   Extract partition information from ATAG setup by boot loader.
   
   static int __init parse_tag_msm_partition(...)
   {
       ....
       msm_nand_data.nr_parts = count;
       msm_nand_data.parts = msm_nand_partitions;
   
       return 0;
   }
   
   This puts partition information into flash_platform_data
   
   
2. drivers/mtd/devices/msm_nand.c  (msm nand flash controller driver)
   
   // request to use cmdlinepart parser
   static const char *part_probes[] = { "cmdlinepart", NULL,  };
   ...
   static int __devinit msm_nand_probe(struct platform_device *pdev)
   {
       ...
   #ifdef CONFIG_MTD_PARTITIONS
       err = parse_mtd_partitions(&info->mtd, part_probes,    
                                  &info->parts, 0);
       // if kernel command line has partition information, use it!
       if (err > 0)
           add_mtd_partitions(&info->mtd, info->parts, err);
       else if (err <= 0 && pdata && pdata->parts) {
           // else use partition information from boot loader
           for (i = 0; i < pdata->nr_parts; ++i) {
               pdata->parts[i].offset *= info->mtd.erasesize;
               pdata->parts[i].size *= info->mtd.erasesize;
           }
           add_mtd_partitions(&info->mtd,
                              pdata->parts, pdata->nr_parts);
       } else
   #endif
           err = add_mtd_device(&info->mtd);
   }