On 2017-08-31 21:32:30 [+0200], Thomas Gleixner wrote: > > zram_lock_table() is bit_spin_lock() on !RT and spin_lock(&table->lock); > > on RT. So this is done. > > !RT has this running in a kmap_atomic() section so they have no > > preemption there. > > zcomp_stream_get() returns a per-CPU object which is protected with a > > spinlock and only accessed locked. > > So when we are inside a spinlocked section, why is this_cpu_ptr() not > working? That does not make sense.
zram_decompress_page() invokes zcomp_stream_get() within a spin_lock section (zram_lock_table()). This is fine. zram_bvec_write() does not invoke zcomp_stream_get() within a spin_lock section. > Thanks, > > tglx Sebastian
