Build errors on mainline kernel

[Kumar Gala]

On Aug 9, 2013, at 1:24 PM, Sukadev Bhattiprolu wrote:

> 
> I am tryng to compile clean mainline kernel with a few different config files
> and running into errors with some configs.
> 
> I am building on RHEL6.3 with following binaries:
> 
> 	gcc (GCC) 4.4.6 20120305 (Red Hat 4.4.6-4)
> 	GNU ld version 2.20.51.0.2-5.34.el6 20100205
> 	binutils-2.20.51.0.2-5.34.el6.ppc64
> 	binutils-devel-2.20.51.0.2-5.34.el6.ppc64
> 
> I am getting the error with several files and configs, but other configs 
> (eg: ppc64_defconfig, pmac32_defconfig) build fine.
> 
> For instance, with latest mainline kernel (commit 6c2580c) and ppc64_defconfig, I get:
> 
> 	make O=linux-obj mrproper
> 	make O=linux-obj ppc64e_defconfig
> 	make O=linux-obj arch/powerpc/platforms/85xx/smp.o
> 	  ...
> 
> 	CC      arch/powerpc/platforms/85xx/smp.o
> 	{standard input}: Assembler messages:
> 	{standard input}:240: Error: junk at end of line: `1'
> 	make[2]: *** [arch/powerpc/platforms/85xx/smp.o] Error 1
> 	make[1]: *** [arch/powerpc/platforms/85xx/smp.o] Error 2
> 
> Not sure if 240 is a line number in smp.c, but looking through the function
> containing line 240, I was able to compile the smp.c after commenting out
> the two WARN_ON() messages.
> 
> diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp
> index 5ced4f5..9705850 100644
> --- a/arch/powerpc/platforms/85xx/smp.c
> +++ b/arch/powerpc/platforms/85xx/smp.c
> @@ -151,8 +151,10 @@ static int smp_85xx_kick_cpu(int nr)
>        int ioremappable;
>        int ret = 0;
> 
> +#if 0
>        WARN_ON(nr < 0 || nr >= NR_CPUS);
>        WARN_ON(hw_cpu < 0 || hw_cpu >= NR_CPUS);
> +#endif
> 
>        pr_debug("smp_85xx_kick_cpu: kick CPU #%d\n", nr);
> 
> ---
> 
> The pre-processor output for the first WARN_ON() is:
> 
> ---
> ({ int __ret_warn_on = !!(nr < 0 || nr >= 32); if (__builtin_constant_p(__ret_warn_on)) { if (__ret_warn_on) do { __asm__ __volatile__( "1:    twi 31,0,0\n" ".section __bug_table,\"a\"\n" "2:\t" ".llong" " " "1b, %0\n" "\t.short %1, %2\n" ".org 2b+%3\n" ".previous\n" : : "i" ("/root/tmp/linux.git/arch/powerpc/platforms/85xx/smp.c"), "i" (154), "i" (((1 << 0) | ((9) << 8))), "i" (sizeof(struct bug_entry))); } while (0); } else { __asm__ __volatile__( "1:      ""tdnei" " ""   %4,0\n" ".section __bug_table,\"a\"\n" "2:\t" ".llong" " " "1b, %0\n" "\t.short %1, %2\n" ".org 2b+%3\n" ".previous\n" : : "i" ("/root/tmp/linux.git/arch/powerpc/platforms/85xx/smp.c"), "i" (154), "i" (((1 << 0) | ((9) << 8))), "i" (sizeof(struct bug_entry)), "r" (__ret_warn_on)); } __builtin_expect(!!(__ret_warn_on), 0); });
> 
> ---
> 
> 
> Should I be doing something different to build with these configs ?
> 

Hmm, that is odd.

How about doing:

$ make V=1

so we can see what compiler flags are being passed around.

- k