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Differential D42708

getpagesize(3): drop support for non-ELF kernels
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Authored by brooks on Nov 22 2023, 1:08 AM.
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imp
emaste
kevans
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rGea180bb3797e: getpagesize(3): drop support for non-ELF kernels
Summary

AT_PAGESZ was introduced with ELF support in 1996 (commit
e1743d02cd14069f69a50bb8a6c626c1c6f47ddd) so we can safely count on
being able to use it to get our page size via elf_aux_info(). As such
we don't need a fallback sysctl query.

Save a few bytes of bss by dropping caching as elf_aux_info() runs
in constant time for a given query.

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rG FreeBSD src repository
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Event Timeline

brooks requested review of this revision.Nov 22 2023, 1:08 AM
brooks created this revision.
Harbormaster completed remote builds in B54556: Diff 130411.Nov 22 2023, 1:08 AM
brooks added a parent revision: D42707: getpagesizes(3): drop support for kernels before 9.0.Nov 22 2023, 1:08 AM
brooks added a child revision: D42709: memfd_create: move implementation to libc/gen.
emaste accepted this revision.Nov 22 2023, 1:23 AM
emaste added inline comments.
lib/libc/gen/getpagesize.c
44–47

maybe simplify by dropping error and just if (_elf_aux_info(AT_PAGESZ, &value, sizeof(value) != 0)...

This revision is now accepted and ready to land.Nov 22 2023, 1:23 AM
imp accepted this revision.Nov 22 2023, 1:47 AM
kevans accepted this revision.Nov 22 2023, 5:45 AM
brooks updated this revision to Diff 130445.Nov 22 2023, 8:32 PM
  • drop error variable
This revision now requires review to proceed.Nov 22 2023, 8:32 PM
Harbormaster completed remote builds in B54579: Diff 130445.Nov 22 2023, 8:32 PM
emaste accepted this revision.Nov 22 2023, 9:44 PM
This revision is now accepted and ready to land.Nov 22 2023, 9:44 PM
Closed by commit rGea180bb3797e: getpagesize(3): drop support for non-ELF kernels (authored by brooks). · Explain WhyNov 28 2023, 5:16 PM
This revision was automatically updated to reflect the committed changes.
brooks added a commit: rGea180bb3797e: getpagesize(3): drop support for non-ELF kernels.

Revision Contents
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PathSize
lib/
libc/
gen/
28 lines

Diff 130654

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lib/libc/gen/getpagesize.c

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