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[PATCH] vmx: Fix register constraint in launch code

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Both "=r" and "=g" breaks my build on i386:

  $ make
    CC [M]  drivers/kvm/vmx.o
  {standard input}: Assembler messages:
  {standard input}:3318: Error: bad register name `%sil'
  make[1]: *** [drivers/kvm/vmx.o] Error 1
  make: *** [_module_drivers/kvm] Error 2

The reason is that setbe requires an 8-bit register but "=r" does not
constrain the target register to be one that has an 8-bit version on
i386.

According to

	http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10153

the correct constraint is "=q".

Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Herbert Xu 2007-01-23 14:10:00 +11:00 • committed by Linus Torvalds
commit e001548911
1 changed files with 1 additions and 1 deletions
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2
drivers/kvm/vmx.c
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@ -1824,7 +1824,7 @@ again:
#endif
"setbe %0 \n\t"
"popf \n\t"
: "=g" (fail)
: "=q" (fail)
: "r"(vcpu->launched), "d"((unsigned long)HOST_RSP),
"c"(vcpu),
[rax]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RAX])),