In preparation for removing smp_read_barrier_depends() altogether, move the Alpha code over to using smp_rmb() and smp_mb() directly.
Acked-by: Paul E. McKenney <paul...@kernel.org> Signed-off-by: Will Deacon <w...@kernel.org> --- arch/alpha/include/asm/atomic.h | 16 ++++++++-------- arch/alpha/include/asm/pgtable.h | 10 +++++----- mm/memory.c | 2 +- 3 files changed, 14 insertions(+), 14 deletions(-) diff --git a/arch/alpha/include/asm/atomic.h b/arch/alpha/include/asm/atomic.h index 2144530d1428..2f8f7e54792f 100644 --- a/arch/alpha/include/asm/atomic.h +++ b/arch/alpha/include/asm/atomic.h @@ -16,10 +16,10 @@ /* * To ensure dependency ordering is preserved for the _relaxed and - * _release atomics, an smp_read_barrier_depends() is unconditionally - * inserted into the _relaxed variants, which are used to build the - * barriered versions. Avoid redundant back-to-back fences in the - * _acquire and _fence versions. + * _release atomics, an smp_mb() is unconditionally inserted into the + * _relaxed variants, which are used to build the barriered versions. + * Avoid redundant back-to-back fences in the _acquire and _fence + * versions. */ #define __atomic_acquire_fence() #define __atomic_post_full_fence() @@ -70,7 +70,7 @@ static inline int atomic_##op##_return_relaxed(int i, atomic_t *v) \ ".previous" \ :"=&r" (temp), "=m" (v->counter), "=&r" (result) \ :"Ir" (i), "m" (v->counter) : "memory"); \ - smp_read_barrier_depends(); \ + smp_mb(); \ return result; \ } @@ -88,7 +88,7 @@ static inline int atomic_fetch_##op##_relaxed(int i, atomic_t *v) \ ".previous" \ :"=&r" (temp), "=m" (v->counter), "=&r" (result) \ :"Ir" (i), "m" (v->counter) : "memory"); \ - smp_read_barrier_depends(); \ + smp_mb(); \ return result; \ } @@ -123,7 +123,7 @@ static __inline__ s64 atomic64_##op##_return_relaxed(s64 i, atomic64_t * v) \ ".previous" \ :"=&r" (temp), "=m" (v->counter), "=&r" (result) \ :"Ir" (i), "m" (v->counter) : "memory"); \ - smp_read_barrier_depends(); \ + smp_mb(); \ return result; \ } @@ -141,7 +141,7 @@ static __inline__ s64 atomic64_fetch_##op##_relaxed(s64 i, atomic64_t * v) \ ".previous" \ :"=&r" (temp), "=m" (v->counter), "=&r" (result) \ :"Ir" (i), "m" (v->counter) : "memory"); \ - smp_read_barrier_depends(); \ + smp_mb(); \ return result; \ } diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h index 162c17b2631f..660b14ce1317 100644 --- a/arch/alpha/include/asm/pgtable.h +++ b/arch/alpha/include/asm/pgtable.h @@ -277,9 +277,9 @@ extern inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= __DIRTY_BITS; retur extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= __ACCESS_BITS; return pte; } /* - * The smp_read_barrier_depends() in the following functions are required to - * order the load of *dir (the pointer in the top level page table) with any - * subsequent load of the returned pmd_t *ret (ret is data dependent on *dir). + * The smp_rmb() in the following functions are required to order the load of + * *dir (the pointer in the top level page table) with any subsequent load of + * the returned pmd_t *ret (ret is data dependent on *dir). * * If this ordering is not enforced, the CPU might load an older value of * *ret, which may be uninitialized data. See mm/memory.c:__pte_alloc for @@ -293,7 +293,7 @@ extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= __ACCESS_BITS; retu extern inline pmd_t * pmd_offset(pud_t * dir, unsigned long address) { pmd_t *ret = (pmd_t *) pud_page_vaddr(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1)); - smp_read_barrier_depends(); /* see above */ + smp_rmb(); /* see above */ return ret; } #define pmd_offset pmd_offset @@ -303,7 +303,7 @@ extern inline pte_t * pte_offset_kernel(pmd_t * dir, unsigned long address) { pte_t *ret = (pte_t *) pmd_page_vaddr(*dir) + ((address >> PAGE_SHIFT) & (PTRS_PER_PAGE - 1)); - smp_read_barrier_depends(); /* see above */ + smp_rmb(); /* see above */ return ret; } #define pte_offset_kernel pte_offset_kernel diff --git a/mm/memory.c b/mm/memory.c index 87ec87cdc1ff..e1f2c730d8bb 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -437,7 +437,7 @@ int __pte_alloc(struct mm_struct *mm, pmd_t *pmd) * of a chain of data-dependent loads, meaning most CPUs (alpha * being the notable exception) will already guarantee loads are * seen in-order. See the alpha page table accessors for the - * smp_read_barrier_depends() barriers in page table walking code. + * smp_rmb() barriers in page table walking code. */ smp_wmb(); /* Could be smp_wmb__xxx(before|after)_spin_lock */ -- 2.27.0.212.ge8ba1cc988-goog _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization