Re: gcc 4.5.1 / as 2.20.51.0.11 miscompiling drivers/char/i8k.c ?

[Jim]

On 11/09/2010 02:57 PM, Andreas Schwab wrote:
> Andi Kleen <andi@xxxxxxxxxxxxxx> writes:
> 
>> @@ -142,7 +142,7 @@ static int i8k_smm(struct smm_regs *regs)
>>  		"lahf\n\t"
>>  		"shrl $8,%%eax\n\t"
>>  		"andl $1,%%eax\n"
>> -		:"=a"(rc)
>> +		:"=a"(rc), "=m" (*regs)
> 
> I think this should be "+m".
> 
> Andreas.
> 

Just tested Andi's patch with Andreas' suggestion to make it +m,
i.e. like attached and can confirm it solves the issue.

Thanks guys,
   Jim Bos


--- i8k.c.ORIG	2010-08-02 17:20:46.000000000 +0200
+++ i8k.c	2010-11-09 17:31:29.000000000 +0100
@@ -141,7 +141,7 @@
 		"lahf\n\t"
 		"shrl $8,%%eax\n\t"
 		"andl $1,%%eax\n"
-		:"=a"(rc)
+		:"=a"(rc), "+m" (*regs)
 		:    "a"(regs)
 		:    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
 #else
@@ -166,7 +166,7 @@
 	    "movl %%edx,0(%%eax)\n\t"
 	    "lahf\n\t"
 	    "shrl $8,%%eax\n\t"
-	    "andl $1,%%eax\n":"=a"(rc)
+	    "andl $1,%%eax\n":"=a"(rc), "+m" (*regs)
 	    :    "a"(regs)
 	    :    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
 #endif