[PATCH 1/3] ARM: add support for the generic syscall.h interface

[Will Deacon]

Hi Wade,

On Wed, Feb 22, 2012 at 02:45:36PM +0000, Wade Farnsworth wrote:
> Supplying the asm-generic/syscall.h interface is a
> pre-requisite for HAVE_ARCH_TRACEHOOK
> 
> Signed-off-by: Steven Walter <stevenrwalter at gmail.com>
> Signed-off-by: Wade Farnsworth <wade_farnsworth at mentor.com>
> ---
>  arch/arm/include/asm/syscall.h |   93 ++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 93 insertions(+), 0 deletions(-)
>  create mode 100644 arch/arm/include/asm/syscall.h

[...]

> +
> +static inline void syscall_set_return_value(struct task_struct *task,
> +					    struct pt_regs *regs,
> +					    int error, long val)
> +{
> +	regs->ARM_r0 = (long) error ?: val;
> +}

This looks like far too much fun for kernel code, although I see that '?:'
does appear elsewhere in the kernel. Usually in perl regexs though :)

Will