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lib: disable usbfs zero-copy support by default

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Although we added a detection mechanism for the presence of the Kernel
bug earlier, reading from the incorrectly mapped memory might cause a
bus error on some ARM systems.

With the overall performance benefit being rather minimal for the
data rates of rtl-sdr, disable zero-copy by default.
This commit is contained in:
Steve Markgraf
2019-07-16 23:45:57 +02:00
parent be1d1206bf
commit 81833a1cf6
3 changed files with 15 additions and 1 deletions
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8
CMakeLists.txt
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@@ -126,6 +126,14 @@ else (DETACH_KERNEL_DRIVER)
message (STATUS "Building with kernel driver detaching disabled, use -DDETACH_KERNEL_DRIVER=ON to enable")
endif (DETACH_KERNEL_DRIVER)
option(ENABLE_ZEROCOPY "Enable usbfs zero-copy support" OFF)
if (ENABLE_ZEROCOPY)
message (STATUS "Building with usbfs zero-copy support enabled")
add_definitions(-DENABLE_ZEROCOPY=1)
else (ENABLE_ZEROCOPY)
message (STATUS "Building with usbfs zero-copy support disabled, use -DENABLE_ZEROCOPY=ON to enable")
endif (ENABLE_ZEROCOPY)
########################################################################
# Add subdirectories
########################################################################