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    SubjectRe: [PATCH v2] compat: fixes to allow working with tile arch
    On Monday 09 May 2011, Chris Metcalf wrote:
    > The existing <asm-generic/unistd.h> mechanism doesn't really provide
    > enough to create the 64-bit "compat" ABI properly in a generic way,
    > since the compat ABI is a mix of things were you can re-use the 64-bit
    > versions of syscalls and things where you need a compat wrapper.
    > To provide this in the most direct way possible, I added two new macros
    > to go along with the existing __SYSCALL and __SC_3264 macros: __SC_COMP
    > and SC_COMP_3264. These macros take an additional argument, typically a
    > "compat_sys_xxx" function, which is passed to __SYSCALL if you define
    > __SYSCALL_COMPAT when including the header, resulting in a pointer to
    > the compat function being placed in the generated syscall table.
    > The change also adds some missing definitions to <linux/compat.h> so that
    > it actually has declarations for all the compat syscalls, since the
    > "[nr] = ##call" approach requires proper C declarations for all the
    > functions included in the syscall table.
    > Finally, compat.c defines compat_sys_sigpending() and
    > compat_sys_sigprocmask() even if the underlying architecture doesn't
    > request it, which tries to pull in undefined compat_old_sigset_t defines.
    > We need to guard those compat syscall definitions with appropriate
    > __ARCH_WANT_SYS_xxx ifdefs.
    > Signed-off-by: Chris Metcalf <>
    > ---
    > Arnd - let me know if this matches what you had in mind. Thanks!

    Looks good to me, yes. It's not exactly what I would have done, but
    it absolutely makes sense and I can't see any specific disadvantage
    over the other slightly different approaches.

    Acked-by: Arnd Bergmann <>

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      Last update: 2011-05-11 23:13    [W:0.027 / U:68.064 seconds]
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