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firmware: arm_scmi/perf: Replace zero-length array with flexible-array member

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The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:

struct foo {
        int stuff;
        struct boo array[];
};

By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertenly introduced[3] to the codebase from now on.

This issue was found with the help of Coccinelle.

[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")

Replace the zero-length member "opp" in scmi_msg_resp_perf_describe_levels
structure with flexible-array.

Link: https://lore.kernel.org/r/20200211231252.GA14830@embeddedor
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Gustavo A. R. Silva 2020-02-11 17:12:52 -06:00 committed by Sudeep Holla
parent 4ddfb4af07
commit 8694548ae1
1 changed files with 1 additions and 1 deletions
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2
drivers/firmware/arm_scmi/perf.c
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@ -89,7 +89,7 @@ struct scmi_msg_resp_perf_describe_levels {
__le32 power;
__le16 transition_latency_us;
__le16 reserved;
} opp[0];
} opp[];
};
struct scmi_perf_get_fc_info {