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| author | Andy Lutomirski <luto@kernel.org> | 2016-09-13 14:29:24 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-09-15 08:25:13 +0200 |
| commit | c65eacbe290b8141554c71b2c94489e73ade8c8d (patch) | |
| tree | 001c2aa33a3dded758550c659ced4b70e341e03e /init/Kconfig | |
| parent | d896fa20a70c9e596438728561e058a74ed3196b (diff) | |
| download | lwn-c65eacbe290b8141554c71b2c94489e73ade8c8d.tar.gz lwn-c65eacbe290b8141554c71b2c94489e73ade8c8d.zip | |
sched/core: Allow putting thread_info into task_struct
If an arch opts in by setting CONFIG_THREAD_INFO_IN_TASK_STRUCT,
then thread_info is defined as a single 'u32 flags' and is the first
entry of task_struct. thread_info::task is removed (it serves no
purpose if thread_info is embedded in task_struct), and
thread_info::cpu gets its own slot in task_struct.
This is heavily based on a patch written by Linus.
Originally-from: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jann Horn <jann@thejh.net>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/a0898196f0476195ca02713691a5037a14f2aac5.1473801993.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'init/Kconfig')
| -rw-r--r-- | init/Kconfig | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index cac3f096050d..ec8d43894b02 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -26,6 +26,13 @@ config IRQ_WORK config BUILDTIME_EXTABLE_SORT bool +config THREAD_INFO_IN_TASK + bool + help + Select this to move thread_info off the stack into task_struct. To + make this work, an arch will need to remove all thread_info fields + except flags and fix any runtime bugs. + menu "General setup" config BROKEN |