Re: [PATCH v2 02/16] sparc/compat: Provide an accurate in_compat_syscall implementation

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From: Andy Lutomirski <luto@xxxxxxxxxx>
Date: Mon, 25 Jan 2016 14:24:16 -0800

> On sparc64 compat-enabled kernels, any task can make 32-bit and
> 64-bit syscalls.  is_compat_task returns true in 32-bit tasks, which
> does not necessarily imply that the current syscall is 32-bit.
> 
> Provide an in_compat_syscall implementation that checks whether the
> current syscall is compat.
> 
> As far as I know, sparc is the only architecture on which
> is_compat_task checks the compat status of the task and on which the
> compat status of a syscall can differ from the compat status of the
> task.  On x86, is_compat_task checks the syscall type, not the task
> type.
> 
> Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>

Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>
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