On Sat, 27 Jun 2009, [email protected] wrote:
>
> The patch titled
> alpha: fix percpu build breakage
> has been added to the -mm tree. Its filename is
> alpha-fix-percpu-build-breakage.patch
>
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>
> ------------------------------------------------------
> Subject: alpha: fix percpu build breakage
> From: Tejun Heo <[email protected]>
>
> alpha percpu access requires custom SHIFT_PERCPU_PTR() definition for
> modules to work around addressing range limitation. This is done via
> generating inline assembly using C preprocessing which forces the
> assembler to generate external reference. This happens behind the
> compiler's back and makes the compiler think that static percpu variables
> in modules are unused.
>
> This used to be worked around by using __unused attribute for percpu
> variables which prevent the compiler from omitting the variable; however,
> recent declare/definition attribute unification change broke this as
> __used can't be used for declaration. Also, in the process,
> PER_CPU_ATTRIBUTES definition in alpha percpu.h got broken.
>
> This patch adds PER_CPU_DEF_ATTRIBUTES which is only used for definitions
> and make alpha use it to add __used for percpu variables in modules. This
> also fixes the PER_CPU_ATTRIBUTES double definition bug.
>
> Signed-off-by: Tejun Heo <[email protected]>
> Cc: maximilian attems <[email protected]>
> Cc: Ivan Kokshaysky <[email protected]>
> Cc: Richard Henderson <[email protected]>
> Signed-off-by: Andrew Morton <[email protected]>
> ---
>
> arch/alpha/include/asm/percpu.h | 6 +++---
> include/asm-generic/percpu.h | 4 ++++
> include/linux/percpu-defs.h | 3 ++-
> 3 files changed, 9 insertions(+), 4 deletions(-)
verified that all Debian alpha images build fine with aboves patch.
thanks.