On Sat, Jan 08, Linux Kernel Mailing List wrote:

ChangeSet 1.2347, 2005/01/08 14:02:27-08:00, hpa@zytor.com

	[PATCH] raid6: altivec support
	
	This patch adds Altivec support for RAID-6, if appropriately configured on
	the ppc or ppc64 architectures.  Note that it changes the compile flags for
	ppc64 in order to handle -maltivec correctly; this change was vetted on the
	ppc64 mailing list and OK'd by paulus.

This fails to compile on ppc, enable_kernel_altivec() is an exported but
undeclared function. cpu_features is also missing.

drivers/md/raid6altivec1.c: In function `raid6_altivec1_gen_syndrome':
drivers/md/raid6altivec1.c:99: warning: implicit declaration of function `enable_kernel_altivec'
drivers/md/raid6altivec1.c: In function `raid6_have_altivec':
drivers/md/raid6altivec1.c:111: error: request for member `cpu_features' in something not a structure or union
drivers/md/raid6altivec2.c: In function `raid6_altivec2_gen_syndrome':
drivers/md/raid6altivec2.c:110: warning: implicit declaration of function `enable_kernel_altivec'

There are a few more exported symbols without declaration:
__ashldi3
__ashrdi3
__lshrdi3
enable_kernel_spe
fec_register_ph
fec_unregister_ph
idma_pci9_read
idma_pci9_read_le
local_irq_disable_end
local_irq_enable_end
local_irq_restore_end
local_save_flags_ptr_end
ocp_bus_type
ppc4xx_set_dma_addr


I'm not sure if the EXPORT_SYMBOL should be dropped for them, they have
no users in the current kernel.

--- ../linux-2.6.10-bk12/include/asm-ppc/system.h	2004-12-24 22:34:32.000000000 +0100
+++ ./include/asm-ppc/system.h	2005-01-09 15:53:32.338569809 +0100

@@ -76,6 +76,7 @@ extern void giveup_fpu(struct task_struc
 extern void enable_kernel_fp(void);
 extern void giveup_altivec(struct task_struct *);
 extern void load_up_altivec(struct task_struct *);
+extern void enable_kernel_altivec(void);
 extern void giveup_spe(struct task_struct *);
 extern void load_up_spe(struct task_struct *);
 extern int fix_alignment(struct pt_regs *);