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SubjectRe: Linux 2.4.4-ac3, asm problem in asm-i386/rwsem.h using gcc 3.0 CVS
Date
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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