Sorry if I'm not the first guy talking about this.
I had to do the following patch after upgrading to gcc-2.8.1 (from 2.7.2.3)
-------------------
diff -urp linux-2.0.33/arch/i386/kernel/ioport.c linux/arch/i386/kernel/ioport.c
--- linux-2.0.33/arch/i386/kernel/ioport.c Wed Jan 11 22:10:53 1995
+++ linux/arch/i386/kernel/ioport.c Wed Apr 1 11:07:56 1998
@@ -76,7 +76,7 @@ unsigned int *stack;
asmlinkage int sys_iopl(long ebx,long ecx,long edx,
long esi, long edi, long ebp, long eax, long ds,
long es, long fs, long gs, long orig_eax,
- long eip,long cs,long eflags,long esp,long ss)
+ long eip,long cs,volatile long eflags,long esp,long ss)
{
unsigned int level = ebx;
--------------------
Reason: sys_iopl() has `*(&eflags)=...' at the end, and gcc-2.8.1
optimizes this to absolutely nothing, unless eflags is volatile.
On my system, this caused an X server to crash at probing the videocard.
Sergei
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