* Linux 2.4.4-ac3, asm problem in asm-i386/rwsem.h using gcc 3.0 CVS
@ 2001-05-02 16:13 Christian Iseli
2001-05-03 16:14 ` Mike Black
0 siblings, 1 reply; 4+ messages in thread
From: Christian Iseli @ 2001-05-02 16:13 UTC (permalink / raw)
To: linux-kernel
Hi folks,
I currently fail to compile the 2.4.4-ac3 kernel using latest GCC 3.0 from CVS:
gcc -D__KERNEL__ -I/usr/src/linux/include -Wall -Wstrict-prototypes
-O2 -fomit-frame-pointer -fno-strict-aliasing -pipe
-mpreferred-stack-boundary=2 -march=i686 -DEXPORT_SYMTAB -c sys.c
sys.c: In function `sys_gethostname':
/usr/src/linux/include/asm/rwsem.h:152:
inconsistent operand constraints in an `asm'
Here is the code exerpt:
/*
* unlock after reading
*/
static inline void __up_read(struct rw_semaphore *sem)
{
__s32 tmp = -RWSEM_ACTIVE_READ_BIAS;
__asm__ __volatile__(
"# beginning __up_read\n\t"
LOCK_PREFIX " xadd %%edx,(%%eax)\n\t" /* subtracts 1, returns the old value */
" js 2f\n\t" /* jump if the lock is being waited upon */
"1:\n\t"
".section .text.lock,\"ax\"\n"
"2:\n\t"
" decw %%dx\n\t" /* do nothing if still outstanding active readers */
" jnz 1b\n\t"
" pushl %%ecx\n\t"
" call rwsem_wake\n\t"
" popl %%ecx\n\t"
" jmp 1b\n"
".previous\n"
"# ending __up_read\n"
: "+m"(sem->count), "+d"(tmp)
: "a"(sem)
: "memory", "cc");
}
I'm afraid I know zilch about asm constraints...
Can anybody spot the trouble (and fix it :) ?
Thanks,
Christian
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Linux 2.4.4-ac3, asm problem in asm-i386/rwsem.h using gcc 3.0 CVS
2001-05-02 16:13 Linux 2.4.4-ac3, asm problem in asm-i386/rwsem.h using gcc 3.0 CVS Christian Iseli
@ 2001-05-03 16:14 ` Mike Black
2001-05-04 13:16 ` Christian Iseli
0 siblings, 1 reply; 4+ messages in thread
From: Mike Black @ 2001-05-03 16:14 UTC (permalink / raw)
To: linux-kernel, Christian Iseli
Looks like if you remove the "inline" from the function definition this
compiles OK.
________________________________________
Michael D. Black Principal Engineer
mblack@csihq.com 321-676-2923,x203
http://www.csihq.com Computer Science Innovations
http://www.csihq.com/~mike My home page
FAX 321-676-2355
----- Original Message -----
From: "Christian Iseli" <chris@ludwig-alpha.unil.ch>
To: <linux-kernel@vger.kernel.org>
Sent: Wednesday, May 02, 2001 12:13 PM
Subject: Linux 2.4.4-ac3, asm problem in asm-i386/rwsem.h using gcc 3.0 CVS
Hi folks,
I currently fail to compile the 2.4.4-ac3 kernel using latest GCC 3.0 from
CVS:
gcc -D__KERNEL__ -I/usr/src/linux/include -Wall -Wstrict-prototypes
-O2 -fomit-frame-pointer -fno-strict-aliasing -pipe
-mpreferred-stack-boundary=2 -march=i686 -DEXPORT_SYMTAB -c sys.c
sys.c: In function `sys_gethostname':
/usr/src/linux/include/asm/rwsem.h:152:
inconsistent operand constraints in an `asm'
Here is the code exerpt:
/*
* unlock after reading
*/
static inline void __up_read(struct rw_semaphore *sem)
{
__s32 tmp = -RWSEM_ACTIVE_READ_BIAS;
__asm__ __volatile__(
"# beginning __up_read\n\t"
LOCK_PREFIX " xadd %%edx,(%%eax)\n\t" /* subtracts 1, returns the
old value */
" js 2f\n\t" /* jump if the lock is being waited
upon */
"1:\n\t"
".section .text.lock,\"ax\"\n"
"2:\n\t"
" decw %%dx\n\t" /* do nothing if still outstanding
active readers */
" jnz 1b\n\t"
" pushl %%ecx\n\t"
" call rwsem_wake\n\t"
" popl %%ecx\n\t"
" jmp 1b\n"
".previous\n"
"# ending __up_read\n"
: "+m"(sem->count), "+d"(tmp)
: "a"(sem)
: "memory", "cc");
}
I'm afraid I know zilch about asm constraints...
Can anybody spot the trouble (and fix it :) ?
Thanks,
Christian
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Linux 2.4.4-ac3, asm problem in asm-i386/rwsem.h using gcc 3.0 CVS
2001-05-03 16:14 ` Mike Black
@ 2001-05-04 13:16 ` Christian Iseli
0 siblings, 0 replies; 4+ messages in thread
From: Christian Iseli @ 2001-05-04 13:16 UTC (permalink / raw)
To: Mike Black; +Cc: linux-kernel
mblack@csihq.com said:
> Looks like if you remove the "inline" from the function definition
> this compiles OK.
Yup, looks like a compiler bug. I submitted a bug report to GCC-gnats.
Cheers,
Christian
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Linux 2.4.4-ac3, asm problem in asm-i386/rwsem.h using gcc 3.0 CVS
[not found] <org0em8zhu.fsf@guarana.lsd.ic.unicamp.br>
@ 2001-05-03 12:11 ` Christian Iseli
0 siblings, 0 replies; 4+ messages in thread
From: Christian Iseli @ 2001-05-03 12:11 UTC (permalink / raw)
To: Alexandre Oliva; +Cc: gcc, linux-kernel
Hi,
aoliva@redhat.com said:
> I believe we'd need at least the source code of this function to be
> able to duplicate the problem with GCC. Would you please submit a
> full bug report, following the guidelines at <URL:http://gcc.gnu.org/
> bugs.html>? Thanks in advance,
Ok, I filed a bug report to gcc-gnats, with pre-processed sources: `c/2728'
BTW, it is possible to compile sys.c with -O instead of -O2, and the problem
is not triggered...
Cheers,
Christian
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2001-05-04 13:16 UTC | newest]
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2001-05-02 16:13 Linux 2.4.4-ac3, asm problem in asm-i386/rwsem.h using gcc 3.0 CVS Christian Iseli
2001-05-03 16:14 ` Mike Black
2001-05-04 13:16 ` Christian Iseli
[not found] <org0em8zhu.fsf@guarana.lsd.ic.unicamp.br>
2001-05-03 12:11 ` Christian Iseli
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