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author | Jeremy Kerr <jk@ozlabs.org> | 2017-02-16 05:24:09 +0100 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2017-02-16 15:32:19 +0100 |
commit | 5d4bac9a5f4ef24b2482529bda6661a58e5b5b65 (patch) | |
tree | 1148ff3f04d9b22f1cb859829b0472b32fa75001 /drivers/irqchip/irq-st.c | |
parent | genirq/msi: Add stubs for get_cached_msi_msg/pci_write_msi_msg (diff) | |
download | linux-5d4bac9a5f4ef24b2482529bda6661a58e5b5b65.tar.xz linux-5d4bac9a5f4ef24b2482529bda6661a58e5b5b65.zip |
genirq: Clarify logic calculating bogus irqreturn_t values
Although irqreturn_t is an enum, we treat it (and its enumeration
constants) as a bitmask.
However, bad_action_ret() uses a less-than operator to determine whether
an irqreturn_t falls within allowable bit values, which means we need to
know the signededness of an enum type to read the logic, which is
implementation-dependent.
This change explicitly uses an unsigned type for the comparison. We do
this instead of changing to a bitwise test, as the latter compiles to
increased instructions in this hot path.
It looks like we get the correct behaviour currently (bad_action_ret(-1)
returns 1), so this is purely a readability fix.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Link: http://lkml.kernel.org/r/1487219049-4061-1-git-send-email-jk@ozlabs.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/irqchip/irq-st.c')
0 files changed, 0 insertions, 0 deletions