[Xen-devel] [PATCH 0/3] irqsave/restore improvements

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

This series contains two independent but related fixes to do with
irqsave/restore semantics.

The first patch prevents local_irq_restore() from corrupting system flags.

The second was constructed using the compile errors from the third patch,
separated for clarity and reordered to prevent bisection problems.

The third patch uses a BUILD_BUG_ON() to ensure that the flags parameter to
spin_lock_irqsave is wide enough to not trucate the result from
local_irq_save().

I have not compile tested on arm, so request that one of the maintainers
explicitly acks the final patch.  Any compile failures will almost certainly
be fixed with an int->unsigned long conversion on the affected variable(s).

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Keir Fraser <keir@xxxxxxx>
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Ian Campbell <ian.campbell@xxxxxxxxxx>
CC: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
CC: Tim Deegan <tim@xxxxxxx>
CC: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

--
1.7.10.4


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