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| author | Peter Zijlstra <peterz@infradead.org> | 2020-08-06 15:35:11 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-08-06 17:13:13 +0300 |
| commit | 0cd39f4600ed4de859383018eb10f0f724900e1b (patch) | |
| tree | 9768dea08f4926b702926ef15699413e37932a7c /include/linux/mutex.h | |
| parent | b3545192e2b4647234254c5122f8cbfddbcbdaa0 (diff) | |
| download | linux-0cd39f4600ed4de859383018eb10f0f724900e1b.tar.xz | |
locking/seqlock, headers: Untangle the spaghetti monster
By using lockdep_assert_*() from seqlock.h, the spaghetti monster
attacked.
Attack back by reducing seqlock.h dependencies from two key high level headers:
- <linux/seqlock.h>: -Remove <linux/ww_mutex.h>
- <linux/time.h>: -Remove <linux/seqlock.h>
- <linux/sched.h>: +Add <linux/seqlock.h>
The price was to add it to sched.h ...
Core header fallout, we add direct header dependencies instead of gaining them
parasitically from higher level headers:
- <linux/dynamic_queue_limits.h>: +Add <asm/bug.h>
- <linux/hrtimer.h>: +Add <linux/seqlock.h>
- <linux/ktime.h>: +Add <asm/bug.h>
- <linux/lockdep.h>: +Add <linux/smp.h>
- <linux/sched.h>: +Add <linux/seqlock.h>
- <linux/videodev2.h>: +Add <linux/kernel.h>
Arch headers fallout:
- PARISC: <asm/timex.h>: +Add <asm/special_insns.h>
- SH: <asm/io.h>: +Add <asm/page.h>
- SPARC: <asm/timer_64.h>: +Add <uapi/asm/asi.h>
- SPARC: <asm/vvar.h>: +Add <asm/processor.h>, <asm/barrier.h>
-Remove <linux/seqlock.h>
- X86: <asm/fixmap.h>: +Add <asm/pgtable_types.h>
-Remove <asm/acpi.h>
There's also a bunch of parasitic header dependency fallout in .c files, not listed
separately.
[ mingo: Extended the changelog, split up & fixed the original patch. ]
Co-developed-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200804133438.GK2674@hirez.programming.kicks-ass.net
Diffstat (limited to 'include/linux/mutex.h')
| -rw-r--r-- | include/linux/mutex.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/mutex.h b/include/linux/mutex.h index ae197cc00cc8..dcd185cbfe79 100644 --- a/include/linux/mutex.h +++ b/include/linux/mutex.h @@ -65,6 +65,17 @@ struct mutex { #endif }; +struct ww_class; +struct ww_acquire_ctx; + +struct ww_mutex { + struct mutex base; + struct ww_acquire_ctx *ctx; +#ifdef CONFIG_DEBUG_MUTEXES + struct ww_class *ww_class; +#endif +}; + /* * This is the control structure for tasks blocked on mutex, * which resides on the blocked task's kernel stack: |