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[PATCH] RAID6 Altivec fix

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This patch fixes a signedness bug with RAID6 for Altivec, and makes the
Altivec code testable in userspace.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
H. Peter Anvin 2005-09-16 19:27:29 -07:00 committed by Linus Torvalds
parent 0d0fc3a2d6
commit d7e70ba45f
4 changed files with 40 additions and 10 deletions
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4
drivers/md/raid6.h
View file

@ -69,9 +69,13 @@ extern const char raid6_empty_zero_page[PAGE_SIZE];
#define __init #define __init
#define __exit #define __exit
#define __attribute_const__ __attribute__((const)) #define __attribute_const__ __attribute__((const))
#define noinline __attribute__((noinline))
#define preempt_enable() #define preempt_enable()
#define preempt_disable() #define preempt_disable()
#define cpu_has_feature(x) 1
#define enable_kernel_altivec()
#define disable_kernel_altivec()
#endif /* __KERNEL__ */ #endif /* __KERNEL__ */

1
drivers/md/raid6algos.c
View file

@ -19,6 +19,7 @@
#include "raid6.h" #include "raid6.h"
#ifndef __KERNEL__ #ifndef __KERNEL__
#include <sys/mman.h> #include <sys/mman.h>
#include <stdio.h>
#endif #endif
struct raid6_calls raid6_call; struct raid6_calls raid6_call;

18
drivers/md/raid6altivec.uc
View file

@ -27,16 +27,20 @@
#ifdef CONFIG_ALTIVEC #ifdef CONFIG_ALTIVEC
#include <altivec.h> #include <altivec.h>
#include <asm/system.h> #ifdef __KERNEL__
#include <asm/cputable.h> # include <asm/system.h>
# include <asm/cputable.h>
#endif
/* /*
* This is the C data type to use * This is the C data type to use. We use a vector of
* signed char so vec_cmpgt() will generate the right
* instruction.
*/ */
typedef vector unsigned char unative_t; typedef vector signed char unative_t;
#define NBYTES(x) ((vector unsigned char) {x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x}) #define NBYTES(x) ((vector signed char) {x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x})
#define NSIZE sizeof(unative_t) #define NSIZE sizeof(unative_t)
/* /*
@ -108,7 +112,11 @@ int raid6_have_altivec(void);
int raid6_have_altivec(void) int raid6_have_altivec(void)
{ {
/* This assumes either all CPUs have Altivec or none does */ /* This assumes either all CPUs have Altivec or none does */
# ifdef __KERNEL__
return cpu_has_feature(CPU_FTR_ALTIVEC); return cpu_has_feature(CPU_FTR_ALTIVEC);
# else
return 1;
# endif
} }
#endif #endif

27
drivers/md/raid6test/Makefile
View file

@ -8,6 +8,8 @@ OPTFLAGS = -O2 # Adjust as desired
CFLAGS = -I.. -g $(OPTFLAGS) CFLAGS = -I.. -g $(OPTFLAGS)
LD = ld LD = ld
PERL = perl PERL = perl
AR = ar
RANLIB = ranlib
.c.o: .c.o:
$(CC) $(CFLAGS) -c -o $@ $< $(CC) $(CFLAGS) -c -o $@ $<
@ -18,18 +20,33 @@ PERL = perl
%.uc: ../%.uc %.uc: ../%.uc
cp -f $< $@ cp -f $< $@
all: raid6.o raid6test all: raid6.a raid6test
raid6.o: raid6int1.o raid6int2.o raid6int4.o raid6int8.o raid6int16.o \ raid6.a: raid6int1.o raid6int2.o raid6int4.o raid6int8.o raid6int16.o \
raid6int32.o \ raid6int32.o \
raid6mmx.o raid6sse1.o raid6sse2.o \ raid6mmx.o raid6sse1.o raid6sse2.o \
raid6altivec1.o raid6altivec2.o raid6altivec4.o raid6altivec8.o \
raid6recov.o raid6algos.o \ raid6recov.o raid6algos.o \
raid6tables.o raid6tables.o
$(LD) -r -o $@ $^ rm -f $@
$(AR) cq $@ $^
$(RANLIB) $@
raid6test: raid6.o test.c raid6test: test.c raid6.a
$(CC) $(CFLAGS) -o raid6test $^ $(CC) $(CFLAGS) -o raid6test $^
raid6altivec1.c: raid6altivec.uc ../unroll.pl
$(PERL) ../unroll.pl 1 < raid6altivec.uc > $@
raid6altivec2.c: raid6altivec.uc ../unroll.pl
$(PERL) ../unroll.pl 2 < raid6altivec.uc > $@
raid6altivec4.c: raid6altivec.uc ../unroll.pl
$(PERL) ../unroll.pl 4 < raid6altivec.uc > $@
raid6altivec8.c: raid6altivec.uc ../unroll.pl
$(PERL) ../unroll.pl 8 < raid6altivec.uc > $@
raid6int1.c: raid6int.uc ../unroll.pl raid6int1.c: raid6int.uc ../unroll.pl
$(PERL) ../unroll.pl 1 < raid6int.uc > $@ $(PERL) ../unroll.pl 1 < raid6int.uc > $@
@ -52,7 +69,7 @@ raid6tables.c: mktables
./mktables > raid6tables.c ./mktables > raid6tables.c
clean: clean:
rm -f *.o mktables mktables.c raid6int.uc raid6*.c raid6test rm -f *.o *.a mktables mktables.c raid6int.uc raid6*.c raid6test
spotless: clean spotless: clean
rm -f *~ rm -f *~