i am a new linux user. i want to download linux kernel source code for understanding about system calls. At http://www.kernel.org/ i am getting several things. i am not getting what to download. i want entry.s file. can any one help me??

If you can't get it from kernel.org (normally), you're looking for the wrong thing.
*Which* entry.S (note the capital) would you be looking for ?. And what did you download ?.

Perhaps you are jumping in the deep end.

i am looking for this path...

linux/arch/i386/kernel/entry.S

i could not find i386.. actually, i have to add a new system call. i want help in that. whatever i studied till now, i found that i have to add number in unistd.h and in entry.S system calls table..( like this "ENTRY(sys_call_table)", i have to make another entry for my own system call. so, i want "entry.S".(its capital only). and, i read here only that for entry.S, i will need kernel source code. thats what, i want.. i am a new linux user. so, please, tell me what to do in detail. thatk you

Moved: This thread is more suitable in <Linux - Kernel> and has been moved accordingly to help your thread/question get the exposure it deserves.

@www.kernel.org in the home page, look for stable releases (currently they are 3.0.4, 2.6.39.4, 2.6.38.8, 2.6.37.6), click on Full Source and you can start to download the tarball. If you need older releases, look for longterm versions in the same page or check in the kernel archives here: ftp://ftp.kernel.org/pub/linux/kernel/v2.6/.

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The closest I can find is linux/arch/x86/kernel/entry_32.S. Perhaps that?

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The source trees for the x86 environments were merged some time back.
Blindly following some (apparently now outdated) document will get you nowhere. You need to be able to keep up (and adapt) as the kernel changes - which it does constantly.

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As pointed by syg00 things might have changed from the time the document you are referring to was written, try out a few things and see what works.

i want to make a new system call. i have edited all the files like
L/arch/x86/kernel/syscall_table_32.S
L/linux/include/asm-x86/unistd_32.h
L/include/linux/syscalls.h
i have changed the kernel makefile too
this is my system call
asmlinkage long sys_sysSum (int a, int b)
{
printk("calling sysSum\n");
return a+b;
}
bt, i am getting error
error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘long’
what to do?? plz help..

i have now compiled the kernel source code with my system call.
but, it is returning -1
please help me

i got to know that, it is error no 38, function not implemented. can you please tell me in detail, what can be the cause? what is the problem??