From: Jim Bos Date: Sat, 13 Nov 2010 11:13:53 +0000 (+0100) Subject: i8k: Tell gcc that *regs gets clobbered X-Git-Tag: v2.6.33.13~10 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f0d610fe2700397bc58fe9f255fa2186bf3b0b9b;p=karo-tx-linux.git i8k: Tell gcc that *regs gets clobbered commit 6b4e81db2552bad04100e7d5ddeed7e848f53b48 upstream. More recent GCC caused the i8k driver to stop working, on Slackware compiler was upgraded from gcc-4.4.4 to gcc-4.5.1 after which it didn't work anymore, meaning the driver didn't load or gave total nonsensical output. As it turned out the asm(..) statement forgot to mention it modifies the *regs variable. Credits to Andi Kleen and Andreas Schwab for providing the fix. Signed-off-by: Jim Bos Cc: Andi Kleen Cc: Andreas Schwab Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c index fc8cf7ac7f2b..828fd24cdbf5 100644 --- a/drivers/char/i8k.c +++ b/drivers/char/i8k.c @@ -141,7 +141,7 @@ 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) : "a"(regs) : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); #else @@ -166,7 +166,8 @@ static int i8k_smm(struct smm_regs *regs) "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