CVS log for src/sys/arch/powerpc/include/param.h

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Default branch: MAIN
Current tag: is-mlppp-base

Revision 1.32 / (download) - annotate - [select for diffs], Fri Feb 21 12:56:37 2020 UTC (4 years, 1 month ago) by rin
Branch: MAIN
CVS Tags: phil-wifi-20200421, phil-wifi-20200411, phil-wifi-20200406, is-mlppp-base, is-mlppp, bouyer-xenpvh-base2, bouyer-xenpvh-base1, bouyer-xenpvh-base, bouyer-xenpvh, ad-namecache-base3
Changes since 1.31: +2 -2 lines
Diff to previous 1.31 (colored)

Reduce UPAGES from 2 to 1 for ibm4xx, which was originally 1 and bumped
to 2 in rev 1.29:

    http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/powerpc/include/param.h#rev1.29

Since page size is 16KB on ibm4xx, USPACE is still 16KB, which is the
same size as on other powerpc processors.

This avoids kernel crash described in PR kern/54994. Also, even if the
PR is resolved, fork(2) easily fails with ENOMEM if UPAGES is 2, which
requires physically contiguous pages for u-area. No bad side effect is
observed as far as I can see.

XXX
Even with this commit, kern/54994 still critically affects other archs
with __HAVE_CPU_UAREA_ROUTINES, i.e., alpha, mips, powerpc/{oea,booke},
and riscv.

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