title: Kernel configuation for android does not work
body: <p>I want to compile Linux kernel for Android.</p>
  
  <p>I have a kernel configuration</p>
  
  <pre><code>CONFIG_SDCARD_FS=y
  </code></pre>
  
  <p>in the file <code>device/qcom/msmxxxx/msm_defconfig</code>.</p>
  
  <p>The module is located in the directory <code>kernel/fs/sdcardfs</code>. </p>
  
  <p>I have code</p>
  
  <pre><code>source "fs/sdcardfs/Kconfig"
  </code></pre>
  
  <p>in the file <code>kernel/fs/Kconfig</code> </p>
  
  <p>and code</p>
  
  <pre><code>obj-$(CONFIG_SDCARD_FS)     += sdcardfs/
  </code></pre>
  
  <p>in the file <code>kernel/fs/Makefile</code>.</p>
  
  <p>But I find that the module corresponding to this configuration is not compiled. </p>