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SubjectRe: Linux 2.4.10-pre11
Date
Hi,

You are fast. Was just going report this one...
Using debian sid with gcc 2.95.4. Both before and after
appling the patch below I get:

ld -m elf_i386 -T /usr/src/linux/arch/i386/vmlinux.lds -e stext arch/i386/kernel/head.o arch/i386/kernel/init_task.o init/main.o init/version.o \
--start-group \
arch/i386/kernel/kernel.o arch/i386/mm/mm.o kernel/kernel.o mm/mm.o fs/fs.o ipc/ipc.o \ drivers/char/char.o drivers/block/block.o drivers/misc/misc.o drivers/net/net.o drivers/media/media.o drivers/char/drm/drm.o drivers/ide/idedriver.o drivers/cdrom/driver.o drivers/pci/driver.o drivers/video/video.o drivers/usb/usbdrv.o drivers/md/mddev.o \
net/network.o \
/usr/src/linux/arch/i386/lib/lib.a /usr/src/linux/lib/lib.a /usr/src/linux/arch/i386/lib/lib.a \
--end-group \
-o vmlinux
mm/mm.o: In function `kmem_cache_alloc':
mm/mm.o(.text+0x8154): undefined reference to `__builtin_expect'
mm/mm.o(.text+0x8173): undefined reference to `__builtin_expect'
mm/mm.o(.text+0x81cc): undefined reference to `__builtin_expect'
mm/mm.o: In function `kmalloc':
mm/mm.o(.text+0x8294): undefined reference to `__builtin_expect'
mm/mm.o(.text+0x82b3): undefined reference to `__builtin_expect'
mm/mm.o(.text+0x830c): more undefined references to `__builtin_expect' follow
make: *** [vmlinux] Error 1

Impling the patch below is incomplete?

TIA
Ed Tomlinson

Andrea Arcangeli wrote:

> ah I just got a (verbose) report about one compilation trouble with old
> kernels, the 00_rwsem patch that includes this backwards compatibility
> hunk wasn't applied. This is a very very minor issue. Please Linus
> include this patch to fix the compilation troubles with the old
> compilers:
>
> diff -urN 2.4.10pre10/include/linux/compiler.h rwsem/include/linux/compiler.h
> --- 2.4.10pre10/include/linux/compiler.h Thu Jan 1 01:00:00 1970
> +++ rwsem/include/linux/compiler.h Tue Sep 18 02:02:08 2001
> @@ -0,0 +1,13 @@
> +#ifndef __LINUX_COMPILER_H
> +#define __LINUX_COMPILER_H
> +
> +/* Somewhere in the middle of the GCC 2.96 development cycle, we implemented
> + a mechanism by which the user can annotate likely branch directions and
> + expect the blocks to be reordered appropriately. Define __builtin_expect
> + to nothing for earlier compilers. */
> +
> +#if __GNUC__ == 2 && __GNUC_MINOR__ < 96ld -m elf_i386 -T /usr/src/linux/arch/i386/vmlinux.lds -e stext arch/i386/kernel/head.o arch/i386/kernel/init_task.o init/main.o init/version.o \
--start-group \
arch/i386/kernel/kernel.o arch/i386/mm/mm.o kernel/kernel.o mm/mm.o fs/fs.o ipc/ipc.o \ drivers/char/char.o drivers/block/block.o drivers/misc/misc.o drivers/net/net.o drivers/media/media.o drivers/char/drm/drm.o drivers/ide/idedriver.o drivers/cdrom/driver.o drivers/pci/driver.o drivers/video/video.o drivers/usb/usbdrv.o drivers/md/mddev.o \
net/network.o \
/usr/src/linux/arch/i386/lib/lib.a /usr/src/linux/lib/lib.a /usr/src/linux/arch/i386/lib/lib.a \
--end-group \
-o vmlinux
mm/mm.o: In function `kmem_cache_alloc':
mm/mm.o(.text+0x8154): undefined reference to `__builtin_expect'
mm/mm.o(.text+0x8173): undefined reference to `__builtin_expect'
mm/mm.o(.text+0x81cc): undefined reference to `__builtin_expect'
mm/mm.o: In function `kmalloc':
mm/mm.o(.text+0x8294): undefined reference to `__builtin_expect'
mm/mm.o(.text+0x82b3): undefined reference to `__builtin_expect'
mm/mm.o(.text+0x830c): more undefined references to `__builtin_expect' follow
make: *** [vmlinux] Error 1
> +#define __builtin_expect(x, expected_value) (x)
> +#endif
> +
> +#endif /* __LINUX_COMPILER_H */
>
> Then you need to simply include <linux/compile.h> from the files that
> doesn't compile, this second patch is untested but it should do the
> trick (00_rwsem-?? was including compile.h from the rwsem includes that
> were in turn included by those files implicitly so I didn't need to add
> compile.h in each file):
>
> --- 2.4.10pre11/mm/slab.c.~1~ Tue Sep 18 02:43:04 2001
> +++ 2.4.10pre11/mm/slab.c Tue Sep 18 04:00:30 2001
> @@ -72,6 +72,7 @@
> #include <linux/slab.h>
> #include <linux/interrupt.h>
> #include <linux/init.h>
> +#include <linux/compile.h>
> #include <asm/uaccess.h>
>
> /*
> --- 2.4.10pre11/mm/page_alloc.c.~1~ Tue Sep 18 02:43:04 2001
> +++ 2.4.10pre11/mm/page_alloc.c Tue Sep 18 04:00:20 2001
> @@ -17,6 +17,7 @@
> #include <linux/pagemap.h>
> #include <linux/bootmem.h>
> #include <linux/slab.h>
> +#include <linux/compile.h>
>
> int nr_swap_pages;
> int nr_active_pages;
> --- 2.4.10pre11/mm/vmscan.c.~1~ Tue Sep 18 02:43:04 2001
> +++ 2.4.10pre11/mm/vmscan.c Tue Sep 18 04:00:47 2001
> @@ -21,6 +21,7 @@
> #include <linux/init.h>
> #include <linux/highmem.h>
> #include <linux/file.h>
> +#include <linux/compile.h>
>
> #include <asm/pgalloc.h>
>
>
> Andrea
-
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