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Merge "Update the kernel header documentation."

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Christopher Ferris 2016-07-08 22:31:14 +00:00 committed by Gerrit Code Review
commit 4580ea4f16
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30
libc/kernel/README.TXT
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@ -1,3 +1,6 @@
Bionic Kernel Header Files
==========================
Bionic comes with a processed set of all of the uapi Linux kernel headers that
can safely be included by userland applications and libraries.
@ -43,19 +46,34 @@ The tools to get/parse the headers:
Automatically update all clean headers from the content of
'external/kernel-headers/original'.
HOW TO UPDATE THE HEADERS WHEN NEEDED:
======================================
How To Update The Headers
=========================
IMPORTANT IMPORTANT:
WHEN UPDATING THE HEADERS, ALWAYS CHECK THAT THE NEW CLEAN HEADERS DO
NOT BREAK THE KERNEL <-> USER ABI, FOR EXAMPLE BY CHANGING THE SIZE
OF A GIVEN TYPE. THIS TASK CANNOT BE EASILY AUTOMATED AT THE MOMENT
OF A GIVEN TYPE. THIS TASK CANNOT BE EASILY AUTOMATED AT THE MOMENT.
Grab the latest headers from the android kernel by running this command:
Download the Linux kernel source code:
bionic/libc/kernel/tools/generate_uapi_headers.sh --download-kernel
> mkdir kernel_src
> cd kernel_src
kernel_src> git clone git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
Then checkout the stable tag for the new kernel headers to import:
kernel_src> cd linux-stable
kernel_src/linux-stable> git checkout tags/vXXX
Before running the command to import the headers, make sure that you have
done a lunch TARGET. The script uses a variable set by the lunch command
to determine which directory to use as the destination directory.
After running lunch, run this command to import the headers into the android
source tree:
bionic/libc/kernel/tools/generate_uapi_headers.sh --use-kernel-dir kernel_src
Next, run this command to copy the parsed files to bionic/libc/kernel/uapi: