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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2015-01-07 00:41:46 +0300 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2015-01-19 16:14:07 +0300 |
| commit | 5ee07612e9e20817bb99256ab6cf1400fd5aa270 (patch) | |
| tree | 40ebd74b5149be78c6dca4e384f25709350874a3 /arch/powerpc/kvm/book3s_xics.c | |
| parent | b1940cd21c0f4abdce101253e860feff547291b0 (diff) | |
| download | linux-5ee07612e9e20817bb99256ab6cf1400fd5aa270.tar.xz | |
ppc/kvm: Replace ACCESS_ONCE with READ_ONCE
ACCESS_ONCE does not work reliably on non-scalar types. For
example gcc 4.6 and 4.7 might remove the volatile tag for such
accesses during the SRA (scalar replacement of aggregates) step
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145)
Change the ppc/kvm code to replace ACCESS_ONCE with READ_ONCE.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/book3s_xics.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_xics.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/arch/powerpc/kvm/book3s_xics.c b/arch/powerpc/kvm/book3s_xics.c index 807351f76f84..a4a8d9f0dcb7 100644 --- a/arch/powerpc/kvm/book3s_xics.c +++ b/arch/powerpc/kvm/book3s_xics.c @@ -327,7 +327,7 @@ static bool icp_try_to_deliver(struct kvmppc_icp *icp, u32 irq, u8 priority, icp->server_num); do { - old_state = new_state = ACCESS_ONCE(icp->state); + old_state = new_state = READ_ONCE(icp->state); *reject = 0; @@ -512,7 +512,7 @@ static void icp_down_cppr(struct kvmppc_xics *xics, struct kvmppc_icp *icp, * in virtual mode. */ do { - old_state = new_state = ACCESS_ONCE(icp->state); + old_state = new_state = READ_ONCE(icp->state); /* Down_CPPR */ new_state.cppr = new_cppr; @@ -567,7 +567,7 @@ static noinline unsigned long kvmppc_h_xirr(struct kvm_vcpu *vcpu) * pending priority */ do { - old_state = new_state = ACCESS_ONCE(icp->state); + old_state = new_state = READ_ONCE(icp->state); xirr = old_state.xisr | (((u32)old_state.cppr) << 24); if (!old_state.xisr) @@ -634,7 +634,7 @@ static noinline int kvmppc_h_ipi(struct kvm_vcpu *vcpu, unsigned long server, * whenever the MFRR is made less favored. */ do { - old_state = new_state = ACCESS_ONCE(icp->state); + old_state = new_state = READ_ONCE(icp->state); /* Set_MFRR */ new_state.mfrr = mfrr; @@ -679,7 +679,7 @@ static int kvmppc_h_ipoll(struct kvm_vcpu *vcpu, unsigned long server) if (!icp) return H_PARAMETER; } - state = ACCESS_ONCE(icp->state); + state = READ_ONCE(icp->state); kvmppc_set_gpr(vcpu, 4, ((u32)state.cppr << 24) | state.xisr); kvmppc_set_gpr(vcpu, 5, state.mfrr); return H_SUCCESS; @@ -721,7 +721,7 @@ static noinline void kvmppc_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr) BOOK3S_INTERRUPT_EXTERNAL_LEVEL); do { - old_state = new_state = ACCESS_ONCE(icp->state); + old_state = new_state = READ_ONCE(icp->state); reject = 0; new_state.cppr = cppr; @@ -885,7 +885,7 @@ static int xics_debug_show(struct seq_file *m, void *private) if (!icp) continue; - state.raw = ACCESS_ONCE(icp->state.raw); + state.raw = READ_ONCE(icp->state.raw); seq_printf(m, "cpu server %#lx XIRR:%#x PPRI:%#x CPPR:%#x MFRR:%#x OUT:%d NR:%d\n", icp->server_num, state.xisr, state.pending_pri, state.cppr, state.mfrr, @@ -1082,7 +1082,7 @@ int kvmppc_xics_set_icp(struct kvm_vcpu *vcpu, u64 icpval) * the ICS states before the ICP states. */ do { - old_state = ACCESS_ONCE(icp->state); + old_state = READ_ONCE(icp->state); if (new_state.mfrr <= old_state.mfrr) { resend = false; |