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Determining whether the header file iosys-map.h is present in the kernel is currently determine by kernel version. However, for Linux v5.15, iosys-map.h has been backported in order to support simple-framebuffer for early display. Therefore, we cannot rely on the kernel version to indicate whether iosys-map is present. This is also true for 3rd party Linux kernels that backport changes as well. Fix this by adding a compile time flag, that will be set accordingly by the conftest script if this header is present. Bug 4119327 Bug 4228080 Change-Id: I303b1060643b18709a236be5e0268d39cf540054 Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2974081 (cherry picked from commit 41c1afb165122e98004005b8513d131b492269e9) Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2946965 Reviewed-by: Sagar Kamble <skamble@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>