Ignored return value of __clear_user in fs/binfmt_elf.c?

[Horst von Brand]

Machine is sparc64, bk of today, gcc-3.4.2-6.fc3 (Aurora Corona). First 2.6
I try to build here, so it might be something known.

Build fails due to -Werror with:

include/asm/uaccess.h: In function `load_elf_binary':
arch/sparc64/kernel/../../../fs/binfmt_elf.c:811: warning: ignoring return value of `__clear_user', declared with attribute warn_unused_result

Around line 811 of fs/binfmt_elf.c I see:

                             /*
                              * This bss-zeroing can fail if the ELF file
                              * specifies odd protections.  So we don't check                                * the return value
                              */
                              (void)clear_user((void __user *)elf_bss +
                                                      load_bias, nbyte);

so presumably this discarding is OK here...

I wonder why an explicit (void) cast is not considered "use" by the
compiler. But then again, explicitly throwing away isn't really "use"...
-- 
Dr. Horst H. von Brand                   User #22616 counter.li.org
Departamento de Informatica                     Fono: +56 32 654431
Universidad Tecnica Federico Santa Maria              +56 32 654239
Casilla 110-V, Valparaiso, Chile                Fax:  +56 32 797513
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