Re: div_u64/do_div stack size usage, was Re: [v3] block: Removed a warning while compiling with a cross compiler for parisc
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From: John David Anglin <hidden>
Date: 2021-07-07 14:42:55
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On 2021-07-07 4:17 a.m., Arnd Bergmann wrote:
I have also tried it with the other gcc versions and shown that it happens with every older compiler as well, but it does not happen with gcc-10 or gcc-11, which bring the frame size down to 164 or 172 bytes respectively. gcc-10 also fixes similar warnings for net/ipv4/tcp_input.c, net/sunrpc/stats.c and lib/xxhash.c that fly under the radar with the default warning level. My first thought was this was a result of -finline-functions getting enabled by default in gcc-10, but enabling it on gcc-9 did not help here. It's likely that the gcc behavior was fixed in the process of enabling the more aggressive inliner by default though.
A number of improvements were made to the calculation of RTX costs in gcc-10 and gcc-11. These dramatically affect inlining and the compilation time for xxhash.c on parisc. The problem is pretty much fixed for the 32-bit target but more work is needed for the 64-bit target. See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87256 Dave -- John David Anglin dave.anglin@bell.net