On Fri 2014-04-18 20:26:59, Ley Foon Tan wrote:
> This patch adds support for system calls from userspaces. It uses the
> asm-generic/unistd.h definitions with architecture spcific syscall. The
> sys_call_table
> is just an array defined in a C file and it contains pointers to the syscall
> functions.
>
> Signed-off-by: Ley Foon Tan <lf...@altera.com>
> +/* Additional Nios II specific syscalls. */
> +#define __NR_cacheflush (__NR_arch_specific_syscall)
> +__SYSCALL(__NR_cacheflush, sys_cacheflush)
I guess you should Cc: Michael Kerrisk on this one.
Also... explanation why you need this syscall while other
architectures live happily without it would be nice.
> +/* sys_cacheflush -- flush the processor cache. */
> +asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len,
> + unsigned int op)
> +{
> + struct vm_area_struct *vma;
> +
> + if (len == 0)
> + return 0;
op is being ignored? You should remove it... or if (op) return -EINVAL
if you want future extensions.
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