Hi liaoweixiong,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on kees/for-next/pstore]
[also build test ERROR on v4.20-rc7 next-20181214]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/liaoweixiong/pstore-fix-crypto-dependencies-of-842-zstd-compression/20181214-222645
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/pstore
config: i386-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   fs/pstore/platform.o: In function `zbufsize_zstd':
>> platform.c:(.text+0x30a): undefined reference to `ZSTD_compressBound'

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