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RISC-V: smb_mb() fix for 4.16-rc4 

This week we have a single fix: replacing smp_mb() with __smp_mb().  We
 were the only architecture with smp_mb() and it appears to just be
 clearly wrong, so I think this is a pretty safe patch for an RC.
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Merge tag 'riscv-for-linus-4.16-rc4_smp_mb' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux

Pull RISC-V fix from Palmer Dabbelt:
 "This week we have a single fix: replacing smp_mb() with __smp_mb().

  We were the only architecture with smp_mb() and it appears to just be
  clearly wrong, so I think this is a pretty safe patch for an RC"

* tag 'riscv-for-linus-4.16-rc4_smp_mb' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux:
  riscv/barrier: Define __smp_{mb,rmb,wmb}
This commit is contained in:
Linus Torvalds 2018-02-28 14:55:07 -08:00
parent 3499de32fa ab4af60534
commit b5e792f11a
1 changed files with 3 additions and 3 deletions
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6
arch/riscv/include/asm/barrier.h
View File

@ -34,9 +34,9 @@
#define wmb() RISCV_FENCE(ow,ow)
/* These barriers do not need to enforce ordering on devices, just memory. */
#define smp_mb() RISCV_FENCE(rw,rw)
#define smp_rmb() RISCV_FENCE(r,r)
#define smp_wmb() RISCV_FENCE(w,w)
#define __smp_mb() RISCV_FENCE(rw,rw)
#define __smp_rmb() RISCV_FENCE(r,r)
#define __smp_wmb() RISCV_FENCE(w,w)
/*
* This is a very specific barrier: it's currently only used in two places in