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powerpc fixes for 6.6 #5

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- Fix stale propagated yield_cpu in qspinlocks leading to lockups.
 
  - Fix broken hugepages on some configs due to ARCH_FORCE_MAX_ORDER.
 
  - Fix a spurious warning when copros are in use at exit time.
 
 Thanks to: Nicholas Piggin, Christophe Leroy, Nysal Jan K.A Sachin Sant,
 Shrikanth Hegde.
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Merge tag 'powerpc-6.6-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:

 - Fix stale propagated yield_cpu in qspinlocks leading to lockups

 - Fix broken hugepages on some configs due to ARCH_FORCE_MAX_ORDER

 - Fix a spurious warning when copros are in use at exit time

Thanks to Nicholas Piggin, Christophe Leroy, Nysal Jan K.A Sachin Sant,
and Shrikanth Hegde.

* tag 'powerpc-6.6-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/qspinlock: Fix stale propagated yield_cpu
  powerpc/64s/radix: Don't warn on copros in radix__tlb_flush()
  powerpc/mm: Allow ARCH_FORCE_MAX_ORDER up to 12
This commit is contained in:
Linus Torvalds 2023-10-21 18:46:47 -07:00
commit 1acfd2bd3f
3 changed files with 5 additions and 9 deletions
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2
arch/powerpc/Kconfig
View File

@ -910,7 +910,7 @@ config ARCH_FORCE_MAX_ORDER
default "6" if PPC32 && PPC_64K_PAGES
range 4 10 if PPC32 && PPC_256K_PAGES
default "4" if PPC32 && PPC_256K_PAGES
range 10 10
range 10 12
default "10"
help
The kernel page allocator limits the size of maximal physically

3
arch/powerpc/lib/qspinlock.c
View File

@ -406,6 +406,9 @@ static __always_inline bool yield_to_prev(struct qspinlock *lock, struct qnode *
if ((yield_count & 1) == 0)
goto yield_prev; /* owner vcpu is running */
if (get_owner_cpu(READ_ONCE(lock->val)) != yield_cpu)
goto yield_prev; /* re-sample lock owner */
spin_end();
preempted = true;

9
arch/powerpc/mm/book3s64/radix_tlb.c
View File

@ -1212,14 +1212,7 @@ void radix__tlb_flush(struct mmu_gather *tlb)
smp_mb(); /* see radix__flush_tlb_mm */
exit_flush_lazy_tlbs(mm);
_tlbiel_pid(mm->context.id, RIC_FLUSH_ALL);
/*
* It should not be possible to have coprocessors still
* attached here.
*/
if (WARN_ON_ONCE(atomic_read(&mm->context.copros) > 0))
__flush_all_mm(mm, true);
__flush_all_mm(mm, true);
preempt_enable();
} else {