[C/R ARM v2][PATCH 1/3] ARM: Rudimentary syscall interfaces

Roland McGrath roland at redhat.com
Wed Apr 28 17:08:08 PDT 2010

> + * syscalls.h - Linux syscall interfaces for ARM


> +static inline int get_swi_instruction(struct task_struct *task,
> +				      struct pt_regs *regs,
> +				      unsigned long *instr)
> +{

Why doesn't this just use access_process_vm?

> +/*
> + * This function essentially duplicates the logic from vector_swi in
> + * arch/arm/kernel/entry-common.S. However, that code is in the
> + * critical path for system calls and is hard to factor out without
> + * compromising performance. 
> + */

No clue about the ARM details, not reviewing that.  I think this is too big
to be an inline and should be in some arch/arm/kernel/*.c place instead.
Of course, if (config_aeabi && !config_oabi) is true at compile time, it's
not large at all.  So perhaps just move the compelx cases to a function
and leave the "Pure EABI" fork in the inline.


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