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McKenney" , Josh Triplett , Steven Rostedt Cc: rcu@vger.kernel.org, linux-kernel@vger.kernel.org Subject: next-20200528 - build error in kernel/rcu/refperf.c Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1590725791_16657P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Fri, 29 May 2020 00:16:31 -0400 Message-ID: <538911.1590725791@turing-police> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --==_Exmh_1590725791_16657P Content-Type: text/plain; charset=us-ascii commit 9088b449814f788d24f35a5840b6b2c2a23cd32a Author: Paul E. McKenney Date: Mon May 25 17:22:24 2020 -0700 refperf: Provide module parameter to specify number of experiments changes this line of code (line 389) - reader_tasks[exp].result_avg = 1000 * process_durations(exp) / ((exp + 1) * loops); + result_avg[exp] = 1000 * process_durations(nreaders) / (nreaders * loops); On a 32-bit ARM make allmodconfig with gcc 8.3, this results in: ERROR: modpost: "__aeabi_uldivmod" [kernel/rcu/refperf.ko] undefined! make[1]: *** [scripts/Makefile.modpost:103: __modpost] Error 1 I admit not understanding why the original line of code worked and the new one doesn't. Maybe gcc is smarter/dumber about the ranges of 'exp' and 'nreaders' than we thought? --==_Exmh_1590725791_16657P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Comment: Exmh version 2.9.0 11/07/2018 iQIVAwUBXtCMngdmEQWDXROgAQI7MA/+PaUvCN+J+yGgfNRmfThCGdLitHgMT/pM 3l8r1S3bKK+IO2sB/SAGJg2VfEXDfpsNqMnQ3xq/qzXIVhz398DoUQsbXFVJlXxd Z/weNlo014uQI6zQ/lmZgM8lPJbGf7gKbQdubVYEjopITztw7+wZ44v+lcup9Ju5 15KdCT5dsUlR8osTEVheW778uZNcEAuJDXhmiHT+Rf8+4ae/MIVEllen/nZ7lE4w NUCO5IvFSM6bEt4WiVobZCUeapvirIJ16b0djsq9zT8FJOKQVFuodSXUVws9+TzG fbYnsS7QRQsOAwcDP/FctWtlth1o1oxQ+j/xnv4DmWj2CCX1ssLRpUvEisYNUA4y 4VrSOgIuAZej5vSVchKAVzuVmC724fTA+pEWQjfbr26a537hgG6C8qnHVsqHuhMV iN+E8Eof5QFhxRW+pQpEA0l09CZGCCFJt1O07d40pWKzlA0lW1/BKfpxikebrVUW yhcDOWVI96vSi2Sg/6bO1M3PaLMS9smXMxAeLwf5JTJ0+KbSjlEYuAZyD2FKGcFy W7P0gsaKj3d7wXCEIJTKq6EidnmVGwGym2J6Ceex1cocf1izxgajF6UDxRhAqoaD NYjhWFgZUvT9Yo8IHzY7peaolq1csokzlYDUDKGFQQJ+s8IOsDc03OsMW3+O7li/ D0aWKEiEAaE= =o/84 -----END PGP SIGNATURE----- --==_Exmh_1590725791_16657P--