Scott Long 69e5b2a38c gpu: nvgpu: container_of() changes to mm code ...

The container_of() macro used in nvgpu produces the following
set of MISRA required rule violations:

 * Rule 11.3 : A cast shall not be performed between a pointer to
               object type and a pointer to a different object type.

 * Rule 11.8 : A cast shall not remove any const or volatile
               qualification from the type pointed to be a pointer.

 * Rule 20.7 : Expressions resulting from the expansion of macro
               parameters shall be enclosed in parentheses

Using the same modified implementation of container_of() as that
used in the nvgpu_list_node/nvgpu_rbtree_node routines eliminates
the Rule 11.8 and Rule 20.7 violations and exchanges the Rule 11.3
violation with an advisory Rule 11.4 violation.

This patch uses that same equivalent implementation in two new
(static) functions that are used to replace references to
container_of() references in vm.c:

 * nvgpu_mapped_buf_from_ref
 * vm_gk20a_from_ref

The implementation of the following routine has also been updated
using the same approach to eliminate the direct reference to
container_of():

* gk20a_from_as

It should be noted that replacement functions still contain
potentially dangerous (and non-MISRA compliant code) and that it is
expected that deviation requests will be filed for the new advisory
rule violations accordingly.

JIRA NVGPU-782

Change-Id: I530f8d0cbe37445535b82578953eb5193ccf682c
Signed-off-by: Scott Long <scottl@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1989570
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Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com>
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Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Adeel Raza <araza@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
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Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2019-01-11 16:15:03 -08:00

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