Please help: question about inline ASM in local_bh_enable

[Lei Luo <lluo@xxxxxxxxxxxxxx>]

Hi,

I have a question about the inline assembly in local_bh_enable, which is 
in asm-i386/softirq.h.
       .....
       "2: pushl %%eax; pushl %%ecx; pushl %%edx;"     \
       "call %c1;"                                     \
                 ^^^
        .....                                                   \
: /* no output */                                       \
: "r" (ptr), "i" (do_softirq)                           \
/* no registers clobbered */ );                         \

I don't understand why it uses "call %c1" instead of "call %1". I 
searched some online tutorials about inline assembly, but none of them 
mentioned this. I wrote a small test code to try it and it works. Is it 
a special syntax for "call"? Can someone give an explanation?

Thanks so much!


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