On Thu, Jul 23, 2015 at 07:54:36PM +0200, Borislav Petkov wrote:
> On Thu, Jul 23, 2015 at 07:08:11PM +0200, Peter Zijlstra wrote:
> > That would be bad, how can we force it to emit 5 bytes?
>
> .byte 0xe9 like we used to do in static_cpu_has_safe().
Like so then?
static __always_inline bool arch_static_branch_jump(struct static_key *key,
bool inv)
{
unsigned long kval = (unsigned long)key + inv;
asm_volatile_goto("1:"
".byte 0xe9\n\t .long %l[l_yes]\n\t"
".pushsection __jump_table, \"aw\" \n\t"
_ASM_ALIGN "\n\t"
_ASM_PTR "1b, %l[l_yes], %c0 \n\t"
".popsection \n\t"
: : "i" (kval) : : l_yes);
return false;
l_yes:
return true;
}
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