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[S390] Bogomips calculation for 64 bit.

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The bogomips calculation triggered via reading from /proc/cpuinfo
can return incorrect values if the qrnnd assembly is called with a
pointer in %r2 with any of the upper 32 bits set.
Fix this by using 64 bit division / remainder operation provided by
gcc instead of calling the assembly.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2007-07-10 11:24:14 +02:00
parent 285f67227b
commit 8a88367088
3 changed files with 16 additions and 5 deletions
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4
arch/s390/lib/Makefile
View File

@ -4,7 +4,7 @@
EXTRA_AFLAGS := -traditional
lib-y += delay.o string.o uaccess_std.o uaccess_pt.o qrnnd.o
obj-$(CONFIG_32BIT) += div64.o
lib-y += delay.o string.o uaccess_std.o uaccess_pt.o
obj-$(CONFIG_32BIT) += div64.o qrnnd.o
lib-$(CONFIG_64BIT) += uaccess_mvcos.o
lib-$(CONFIG_SMP) += spinlock.o

6
include/asm-s390/sfp-machine.h
View File

@ -27,9 +27,9 @@
#define _FP_W_TYPE_SIZE 32
#define _FP_W_TYPE unsigned long
#define _FP_WS_TYPE signed long
#define _FP_I_TYPE long
#define _FP_W_TYPE unsigned int
#define _FP_WS_TYPE signed int
#define _FP_I_TYPE int
#define _FP_MUL_MEAT_S(R,X,Y) \
_FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)

11
include/asm-s390/sfp-util.h
View File

@ -51,6 +51,16 @@
wl = __wl; \
})
#ifdef __s390x__
#define udiv_qrnnd(q, r, n1, n0, d) \
do { unsigned long __n; \
unsigned int __r, __d; \
__n = ((unsigned long)(n1) << 32) + n0; \
__d = (d); \
(q) = __n / __d; \
(r) = __n % __d; \
} while (0)
#else
#define udiv_qrnnd(q, r, n1, n0, d) \
do { unsigned int __r; \
(q) = __udiv_qrnnd (&__r, (n1), (n0), (d)); \
@ -58,6 +68,7 @@
} while (0)
extern unsigned long __udiv_qrnnd (unsigned int *, unsigned int,
unsigned int , unsigned int);
#endif
#define UDIV_NEEDS_NORMALIZATION 0