Re: [head tinderbox] failure on sparc64/sun4v

Wed, Jun 03, 2009 at 09:25:38AM +0400, Eygene Ryabinkin wrote:
> Tue, Jun 02, 2009 at 06:24:45PM -0400, FreeBSD Tinderbox wrote:
> > cc -c -O2 -pipe -fno-strict-aliasing  -std=c99  -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef -Wno-pointer-sign -fformat-extensions -nostdinc  -I. -I/src/sys -I/src/sys/contrib/altq -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h -fno-common -finline-limit=15000 --param inline-unit-growth=100 --param large-function-growth=1000 -fno-builtin -mcmodel=medany -msoft-float -ffreestanding -fstack-protector -Werror  /src/sys/sun4v/sun4v/machdep.c
> > /src/sys/sun4v/sun4v/machdep.c:192: error: size of array '__assert192' is negative
> > *** Error code 1
> > 
> > Stop in /obj/sun4v/src/sys/LINT.
> 
> This seems to be related to the recent NETISR changes, namely, the
> addition of the pc_netisr member to the struct pcpu:
>   http://svn.freebsd.org/viewvc/base/head/sys/sys/pcpu.h?r1=187679&r2=193219&diff_format=u
> 
> I am not sure how large (void *) is on sun4v, but it seems to me
> that it is 4 bytes long, so PCPU_MD_FIELDS_PAD inside sun4v/include/pcpu.h
             ^^^^^^^^^^^^
Sorry, eight bytes long: wrote 4, but really meant 8 ;))

> should be compensated for this change.  Something like
> -----
> #ifdef KTR
> #define	PCPU_MD_FIELDS_PAD	(3 - (PCPU_NAME_LEN + 7) / 8)
> #else
> #define	PCPU_MD_FIELDS_PAD	3
> #endif
> -----
> though I am not very sure about KTR's case.

KTR's case seems to be wrong for PCPU_NAME_LEN larger than 24 bytes.
Just now we won't be able to reach this with the current definition
for PCPU_NAME_LEN, but some day (N - (PCPU_NAME_LEN + 7)/8) can
become negative and that's bad.

The attached patch should fix this (although I have no sun4v to test
on, so take it with a grain of salt).

By the way, having looked at sys/sys/pcpu.h, I see that there are parts
of 'struct pcpu' that depend on the KTR_PERCPU being defined and they
are never compensated with padding in PCPU_MD_FIELDS for sun4v.  Is
KTR_PERCPU constant for sun4v (inexisting or defined everytime) or I am
missing something?

Thanks.
-- 
Eygene
 _                ___       _.--.   #
 \`.|\..----...-'`   `-._.-'_.-'`   #  Remember that it is hard
 /  ' `         ,       __.--'      #  to read the on-line manual
 )/' _/     \   `-_,   /            #  while single-stepping the kernel.
 `-'" `"\_  ,_.-;_.-\_ ',  fsc/as   #
     _.-'_./   {_.'   ; /           #    -- FreeBSD Developers handbook
    {_.-``-'         {_/            #