> Hi, all. I've just grabbed 2.3.30-pre4 (and -pre5 and -pre3) and got
> the following rude shock:
> gcc -D__KERNEL__ -I/home/kernel/v2.3/linux/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -D__SMP__ -pipe -fno-strength-reduce -DCPU=586 -c -o time.o time.c
> time.c: In function `do_gettimeofday':
> time.c:262: fixed or forbidden register was spilled.
> This may be due to a compiler bug or to impossible asm
> statements or clauses.
> cpp: output pipe has been closed
> make[1]: *** [time.o] Error 1
> make[1]: Leaving directory `/home/kernel/v2.3/linux-2.3.30-pre5+devfs/arch/i386/kernel'
> make: *** [_dir_arch/i386/kernel] Error 2
>
> Relevant config section appended. I'm using gcc 2.7.2.f.1 (I've been
> using this compiler for years). The problem appears in pre3 through
> pre5. I didn't check earlier pre-patches. 2.3.28 doesn't have this
> problem.
Yes, gcc-2.7.2.3 and gcc-2.8.1 also get into trouble. With the below,
it will _compile_. (danger: I don't have an smp box to find out if it
will actually _work_ too) Newer compilers don't have a problem with
the original register selection.
-Mike
--- include/asm-i386/rwlock.h.org Fri Dec 3 07:55:43 1999
+++ include/asm-i386/rwlock.h Fri Dec 3 07:54:19 1999
@@ -31,7 +31,7 @@
"2:\tcall " helper "\n\t" \
"jmp 1b\n" \
".previous" \
- ::"a" (rw) : "memory")
+ ::"r" (rw) : "memory")
#define __build_read_lock_const(rw, helper) \
asm volatile(LOCK "subl $1,%0\n\t" \
@@ -61,7 +61,7 @@
"2:\tcall " helper "\n\t" \
"jmp 1b\n" \
".previous" \
- ::"a" (rw) : "memory")
+ ::"r" (rw) : "memory")
#define __build_write_lock_const(rw, helper) \
asm volatile(LOCK "subl $" RW_LOCK_BIAS_STR ",(%0)\n\t" \
-
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