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authorAlexey Dobriyan <adobriyan@gmail.com>2016-08-24 21:03:05 +0300
committerMichal Marek <mmarek@suse.com>2016-08-24 23:34:19 +0300
commitdee81e9886748594babac67c14b0f720148e255d (patch)
tree5c1bc1e5b8c6475e7d5845593f958e34807bfa1c /scripts/genksyms
parente007c53397acb5554e226693e3bff54a312ccd96 (diff)
downloadlinux-dee81e9886748594babac67c14b0f720148e255d.tar.xz
fixdep: faster CONFIG_ search
Do you think kernel build is 100% dominated by gcc? You are wrong! One small utility called "fixdep" consistently manages to sneak into profile's first page (unless you have small monitor of course). The choke point is this clever code: for (; m < end; m++) { if (*m == INT_CONF) { p = (char *) m ; goto conf; } if (*m == INT_ONFI) { p = (char *) m-1; goto conf; } if (*m == INT_NFIG) { p = (char *) m-2; goto conf; } if (*m == INT_FIG_) { p = (char *) m-3; goto conf; } 4 branches per 4 characters is not fast. Use strstr(3), so that SSE2 etc can be used. With this patch, fixdep is so deep at the bottom, it is hard to find it. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Michal Marek <mmarek@suse.com>
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