Re: PCI Express support for 2.4 kernel

[Tomas Szepe <szepe@pinerecords.com>]

On Dec-16 2003, Tue, 05:16 +1100
Keith Owens <kaos@ocs.com.au> wrote:

> Does gcc 3.3.2 handle sections correctly when it optimizes zero
> assignments to use bss?  With just this line in x.c
> 
> static int __attribute__ ((__section__ (".init.data"))) a1 = 0;
> 
> what does objdump -h report?  If bss is 4 bytes then gcc 3.3.2 is
> breaking the kernel's use of init data.  If bss is 0 and .init.data is
> 4 then we are OK.

$ gcc --version| grep GCC
gcc (GCC) 3.3.2
$ cat x.c
static int __attribute__ ((__section__ (".init.data"))) a1 = 0;
$ gcc -c -o x.o x.c
$ objdump -h x.o

x.o:     file format elf32-i386

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         00000000  00000000  00000000  00000034  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  1 .data         00000000  00000000  00000000  00000034  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  2 .bss          00000000  00000000  00000000  00000034  2**2
                  ALLOC
  3 .init.data    00000004  00000000  00000000  00000034  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  4 .comment      00000012  00000000  00000000  00000038  2**0
                  CONTENTS, READONLY

Good.

-- 
Tomas Szepe <szepe@pinerecords.com>