Bit spinlocks are problematic if PREEMPT_RT is enabled, because they disable preemption, which is undesired for latency reasons and breaks when regular spinlocks are taken within the bit_spinlock locked region because regular spinlocks are converted to 'sleeping spinlocks' on RT. PREEMPT_RT replaced the bit spinlocks with regular spinlocks to avoid this problem. The replacement was done conditionaly at compile time, but Christoph requested to do an unconditional conversion. Jan suggested to move the spinlock into a existing padding hole which avoids a size increase of struct buffer_head on production kernels. As a benefit the lock gains lockdep coverage. [ bigeasy: Remove the wrapper and use always spinlock_t and move it into the padding hole ]
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| @@ -22,9 +22,6 @@ enum bh_state_bits { · 21 unmodified lines | ||
| 22 | 22 | BH_Dirty, /* Is dirty */ |
| 23 | 23 | BH_Lock, /* Is locked */ |
| 24 | 24 | BH_Req, /* Has been submitted for I/O */ |
| 25 | − BH_Uptodate_Lock,/* Used by the first bh in a page, to serialise | |
| 26 | − * IO completion of other buffers in the page | |
| 27 | − */ | |
| 28 | 25 | |
| 29 | 26 | BH_Mapped, /* Has a disk mapping */ |
| 30 | 27 | BH_New, /* Disk mapping was newly created by get_block */ |
| @@ -76,6 +73,9 @@ struct buffer_head { · 45 unmodified lines | ||
| 76 | 73 | struct address_space *b_assoc_map; /* mapping this buffer is |
| 77 | 74 | associated with */ |
| 78 | 75 | atomic_t b_count; /* users using this buffer_head */ |
| 76 | + spinlock_t b_uptodate_lock; /* Used by the first bh in a page, to | |
| 77 | + * serialise IO completion of other | |
| 78 | + * buffers in the page */ | |
| 79 | 79 | }; |
| 80 | 80 | |
| 81 | 81 | /* |