On Thu, 24 Jan 2008, Avi Kivity wrote:
>
> make -C user test_cases
> user/kvmctl user/test/x86/bootstrap user/test/x86/access.flat
Ah, thanks!
> > - smp_init(ac_test_run);
> > + smp_init((void (*)(void))ac_test_run);
>
> Better to add a wrapper that conforms to the expected signature, and makes
> sure the return value of ac_test_run() is not lost.
>
> Haven't run access.flat on smp for a long while; the results should be
> interesting after the page fault scaling work.
On my E6850, running 2.6.24-rc7-ish x86_64 kernel with kvm-59,
user/kvmctl -s2 user/test/x86/bootstrap user/test/x86x/(tried all).flat
just hangs without any output, kvmctl consuming 100% of one core.
I could try with kvm-60 at a later time.
Since that means that I can't test any fix I would be able to do along
your suggestion, I removed that hunk from the patch to keep the warning.
> > - unsigned long tmp;
> > + unsigned long tmp = 0;
>
> I'm needlessly pedantic, but the correct fix is to pass the constraint
> "=&r"(tmp) in the write section. This tells gcc the register is clobbered
> ("=") and not to pass any inputs in it ("&").
I ran the test case now, and interestingly, the testcase appeared indeed
broken here (kernel modules were still kvm-59), and the change above didn't
change that behaviour:
ser/kvmctl user/test/x86/bootstrap user/test/x86/emulator.flat
GUEST: paging enabled
GUEST: PASS: mov reg, r/m (1)
GUEST: PASS: repe/cmpsb (1)
GUEST: PASS: repe/cmpsw (1)
GUEST: PASS: repe/cmpll (1)
GUEST: PASS: repe/cmpsq (1)
GUEST: PASS: repe/cmpsb (2)
GUEST: PASS: repe/cmpsw (2)
GUEST: PASS: repe/cmpll (2)
GUEST: PASS: repe/cmpsq (2)
(command hung here, no further output)
Using "=&r"(tmp) fixed this (gcc only accepted this after moving the tmp operand
to the input operands section, but then, only having "=r"(tmp) - (the '=' was
demanded
by gcc in the input section)only fixes it so far as this:
GUEST: paging enabled
GUEST: PASS: mov reg, r/m (1)
GUEST: PASS: repe/cmpsb (1)
GUEST: PASS: repe/cmpsw (1)
GUEST: PASS: repe/cmpll (1)
GUEST: PASS: repe/cmpsq (1)
GUEST: PASS: repe/cmpsb (2)
GUEST: PASS: repe/cmpsw (2)
GUEST: PASS: repe/cmpll (2)
GUEST: PASS: repe/cmpsq (2)
GUEST: PASS: push $imm8
GUEST: PASS: push %reg
GUEST: FAIL: push mem
GUEST: PASS: mov %cr8
GUEST:
GUEST: SUMMARY: 13 tests, 1 failures
and using "=&r"(tmp) all the test work:
GUEST: paging enabled
GUEST: PASS: mov reg, r/m (1)
GUEST: PASS: repe/cmpsb (1)
GUEST: PASS: repe/cmpsw (1)
GUEST: PASS: repe/cmpll (1)
GUEST: PASS: repe/cmpsq (1)
GUEST: PASS: repe/cmpsb (2)
GUEST: PASS: repe/cmpsw (2)
GUEST: PASS: repe/cmpll (2)
GUEST: PASS: repe/cmpsq (2)
GUEST: PASS: push $imm8
GUEST: PASS: push %reg
GUEST: PASS: push mem
GUEST: PASS: mov %cr8
GUEST:
GUEST: SUMMARY: 13 tests, 0 failures
Please find the updated patch below,
Bernhard
This patch fixes user/test/x86/emulator.flat on kvm-59 with x86_64/E6850
and three other warnings:
test/x86/access.c: In function 'ac_test_exec':
test/x86/access.c:541: warning: implicit declaration of function 'strcat'
test/x86/emulator.c: In function 'test_cmps':
test/x86/emulator.c:26: warning: unused variable 'i'
test/x86/emulator.c: In function 'test_push':
test/x86/emulator.c:115: warning: 'tmp' is used uninitialized in this function
test/x86/lib/printf.c: In function 'vsnprintf':
test/x86/lib/printf.c:95: warning: unused variable 'n'
Signed-off-by: Bernhard Kaindl <[EMAIL PROTECTED]>
--- kvm-60/user/test/x86/access.c
+++ kvm-60/user/test/x86/access.c
@@ -1,6 +1,7 @@
#include "smp.h"
#include "printf.h"
+#include "string.h"
#define true 1
#define false 0
--- kvm-60/user/test/x86/emulator.c
+++ kvm-60/user/test/x86/emulator.c
@@ -23,7 +23,6 @@
unsigned char m3[1024];
void *rsi, *rdi;
long rcx, tmp;
- int i;
for (int i = 0; i < 100; ++i)
m1[i] = m2[i] = m3[i] = i;
@@ -119,8 +118,8 @@
"pushq (%[mem]) \n\t"
"mov %%rsp, %[new_stack_top] \n\t"
"mov %[tmp], %%rsp"
- : [new_stack_top]"=r"(new_stack_top)
- : [tmp]"r"(tmp), [stack_top]"r"(stack_top),
+ : [tmp]"=&r"(tmp), [new_stack_top]"=r"(new_stack_top)
+ : [stack_top]"r"(stack_top),
[reg]"r"(-17l), [mem]"r"(&memw)
: "memory");
--- kvm-60/user/test/x86/lib/printf.c
+++ kvm-60/user/test/x86/lib/printf.c 2008/01/24 15:10:35
@@ -92,7 +92,6 @@
int vsnprintf(char *buf, int size, const char *fmt, va_list va)
{
- int n;
pstream_t s;
s.buffer = buf;
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