crypto/asymmetric_keys/x509_cert_parser.o: warning: objtool: x509_note_pkey_algo()+0x83: sibling call from callable instruction with modified stack frame

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e237f98a9c134c3d600353f21e07db915516875b
commit: 76b043848fd22dbf7f8bf3a1452f8c70d557b860 x86/retpoline: Add initial retpoline support
date:   4 weeks ago
config: x86_64-randconfig-s3-02061544 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 76b043848fd22dbf7f8bf3a1452f8c70d557b860
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

>> crypto/asymmetric_keys/x509_cert_parser.o: warning: objtool: x509_note_pkey_algo()+0x83: sibling call from callable instruction with modified stack frame

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