linux-kernel - Re: mmotm 2009-04-24-18-14 uploaded

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Date:	Fri, 24 Apr 2009 23:06:40 -0400
From:	Valdis.Kletnieks@...edu
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>
Cc:	linux-kernel@...r.kernel.org, mm-commits@...r.kernel.org
Subject: Re: mmotm 2009-04-24-18-14 uploaded - NVidia indigestion

On Fri, 24 Apr 2009 18:14:22 PDT, akpm@...ux-foundation.org said:
> The mm-of-the-moment snapshot 2009-04-24-18-14 has been uploaded to
> 
>    http://userweb.kernel.org/~akpm/mmotm/

This jumped out and asked if I wanted SLQB as the default allocator (even
though I've had SLAB defined for ages).  I said to myself "what the heck"
and accepted the change...

Tried to build the NVidia binary, and it choked during config on something
that will likely give a *lot* of programs indigestion.

The test program:

#include <linux/autoconf.h>
    #if defined(CONFIG_XEN) &&         defined(CONFIG_XEN_INTERFACE_VERSION) &&  !defined(__XEN_INTERFACE_VERSION__)
    #define __XEN_INTERFACE_VERSION__ CONFIG_XEN_INTERFACE_VERSION
    #endif
            #include <linux/version.h>
            #include <linux/utsname.h>
            int main() {
              if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)) {
                return 0;
              } else {
                return 1;
              }
            }

The command line:

cc -D__KERNEL__ -DKBUILD_BASENAME="#conftest23112" -DKBUILD_MODNAME="#conftest23112" -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.4.0/include -I/lib/modules/2.6.30-rc3-mmotm0424/source/include/asm-x86_64/mach-default -I/lib/modules/2.6.30-rc3-mmotm0424/source/include/asm-x86/mach-default -I/lib/modules/2.6.30-rc3-mmotm0424/source/arch/x86/include/asm/mach-default -I/lib/modules/2.6.30-rc3-mmotm0424/build/include2 -I/lib/modules/2.6.30-rc3-mmotm0424/build/include -I/lib/modules/2.6.30-rc3-mmotm0424/source/include -I/lib/modules/2.6.30-rc3-mmotm0424/source/arch/x86/include -o conftest23112 conftest23112.c

and the joy it got me:

In file included from /lib/modules/2.6.30-rc3-mmotm0424/build/include/linux/slab.h:161,
                 from /lib/modules/2.6.30-rc3-mmotm0424/build/include/linux/percpu.h:5,
                 from /lib/modules/2.6.30-rc3-mmotm0424/build/include/linux/sched.h:76,
                 from /lib/modules/2.6.30-rc3-mmotm0424/build/include/linux/utsname.h:35,
                 from conftest2465.c:6:
/lib/modules/2.6.30-rc3-mmotm0424/build/include/linux/slqb_def.h: In function ‘kmalloc_slab’:
/lib/modules/2.6.30-rc3-mmotm0424/build/include/linux/slqb_def.h:240: error: size of array ‘type name’ is negative

Why does utsname.h care about SLAB versus SLUB?  (Looks to me like somebody
forgot to add a #include to slqb_def.h for all the headers it needed, and
it choked.  Interestingly enough, line 240 reads:

        BUILD_BUG_ON(!__builtin_constant_p(size));

but I didn't think this was the way BUILD_BUG_ON worked?

Changed back to SLAB, and things built just fine after that...

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