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authorDavid Daney <ddaney@caviumnetworks.com>2009-07-13 11:15:19 -0700
committerRalf Baechle <ralf@linux-mips.org>2009-09-17 20:07:50 +0200
commitb791d1193af9772040e592d5aa161790f800b762 (patch)
tree6adad3d9cdf278a3a1a3418ae75a2864d0cc7f39 /arch/mips/include/asm/atomic.h
parentf7ade3c168e4f437c11f57be012992bbb0e3075c (diff)
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MIPS: Allow kernel use of LL/SC to be separate from the presence of LL/SC.
On some CPUs, it is more efficient to disable and enable interrupts in the kernel rather than use ll/sc for atomic operations. But if we were to set cpu_has_llsc to false, we would break the userspace futex interface (in asm/futex.h). We separate the two concepts, with a new predicate kernel_uses_llsc, that lets us disable the kernel's use of ll/sc while still allowing the futex code to use it. Also there were a couple of cases in bitops.h where we were using ll/sc unconditionally even if cpu_has_llsc were false. Signed-off-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm/atomic.h')
-rw-r--r--arch/mips/include/asm/atomic.h40
1 files changed, 20 insertions, 20 deletions
diff --git a/arch/mips/include/asm/atomic.h b/arch/mips/include/asm/atomic.h
index eb7f01cfd1a..dd75d673447 100644
--- a/arch/mips/include/asm/atomic.h
+++ b/arch/mips/include/asm/atomic.h
@@ -49,7 +49,7 @@
*/
static __inline__ void atomic_add(int i, atomic_t * v)
{
- if (cpu_has_llsc && R10000_LLSC_WAR) {
+ if (kernel_uses_llsc && R10000_LLSC_WAR) {
int temp;
__asm__ __volatile__(
@@ -61,7 +61,7 @@ static __inline__ void atomic_add(int i, atomic_t * v)
" .set mips0 \n"
: "=&r" (temp), "=m" (v->counter)
: "Ir" (i), "m" (v->counter));
- } else if (cpu_has_llsc) {
+ } else if (kernel_uses_llsc) {
int temp;
__asm__ __volatile__(
@@ -94,7 +94,7 @@ static __inline__ void atomic_add(int i, atomic_t * v)
*/
static __inline__ void atomic_sub(int i, atomic_t * v)
{
- if (cpu_has_llsc && R10000_LLSC_WAR) {
+ if (kernel_uses_llsc && R10000_LLSC_WAR) {
int temp;
__asm__ __volatile__(
@@ -106,7 +106,7 @@ static __inline__ void atomic_sub(int i, atomic_t * v)
" .set mips0 \n"
: "=&r" (temp), "=m" (v->counter)
: "Ir" (i), "m" (v->counter));
- } else if (cpu_has_llsc) {
+ } else if (kernel_uses_llsc) {
int temp;
__asm__ __volatile__(
@@ -139,7 +139,7 @@ static __inline__ int atomic_add_return(int i, atomic_t * v)
smp_llsc_mb();
- if (cpu_has_llsc && R10000_LLSC_WAR) {
+ if (kernel_uses_llsc && R10000_LLSC_WAR) {
int temp;
__asm__ __volatile__(
@@ -153,7 +153,7 @@ static __inline__ int atomic_add_return(int i, atomic_t * v)
: "=&r" (result), "=&r" (temp), "=m" (v->counter)
: "Ir" (i), "m" (v->counter)
: "memory");
- } else if (cpu_has_llsc) {
+ } else if (kernel_uses_llsc) {
int temp;
__asm__ __volatile__(
@@ -191,7 +191,7 @@ static __inline__ int atomic_sub_return(int i, atomic_t * v)
smp_llsc_mb();
- if (cpu_has_llsc && R10000_LLSC_WAR) {
+ if (kernel_uses_llsc && R10000_LLSC_WAR) {
int temp;
__asm__ __volatile__(
@@ -205,7 +205,7 @@ static __inline__ int atomic_sub_return(int i, atomic_t * v)
: "=&r" (result), "=&r" (temp), "=m" (v->counter)
: "Ir" (i), "m" (v->counter)
: "memory");
- } else if (cpu_has_llsc) {
+ } else if (kernel_uses_llsc) {
int temp;
__asm__ __volatile__(
@@ -251,7 +251,7 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
smp_llsc_mb();
- if (cpu_has_llsc && R10000_LLSC_WAR) {
+ if (kernel_uses_llsc && R10000_LLSC_WAR) {
int temp;
__asm__ __volatile__(
@@ -269,7 +269,7 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
: "=&r" (result), "=&r" (temp), "=m" (v->counter)
: "Ir" (i), "m" (v->counter)
: "memory");
- } else if (cpu_has_llsc) {
+ } else if (kernel_uses_llsc) {
int temp;
__asm__ __volatile__(
@@ -428,7 +428,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
*/
static __inline__ void atomic64_add(long i, atomic64_t * v)
{
- if (cpu_has_llsc && R10000_LLSC_WAR) {
+ if (kernel_uses_llsc && R10000_LLSC_WAR) {
long temp;
__asm__ __volatile__(
@@ -440,7 +440,7 @@ static __inline__ void atomic64_add(long i, atomic64_t * v)
" .set mips0 \n"
: "=&r" (temp), "=m" (v->counter)
: "Ir" (i), "m" (v->counter));
- } else if (cpu_has_llsc) {
+ } else if (kernel_uses_llsc) {
long temp;
__asm__ __volatile__(
@@ -473,7 +473,7 @@ static __inline__ void atomic64_add(long i, atomic64_t * v)
*/
static __inline__ void atomic64_sub(long i, atomic64_t * v)
{
- if (cpu_has_llsc && R10000_LLSC_WAR) {
+ if (kernel_uses_llsc && R10000_LLSC_WAR) {
long temp;
__asm__ __volatile__(
@@ -485,7 +485,7 @@ static __inline__ void atomic64_sub(long i, atomic64_t * v)
" .set mips0 \n"
: "=&r" (temp), "=m" (v->counter)
: "Ir" (i), "m" (v->counter));
- } else if (cpu_has_llsc) {
+ } else if (kernel_uses_llsc) {
long temp;
__asm__ __volatile__(
@@ -518,7 +518,7 @@ static __inline__ long atomic64_add_return(long i, atomic64_t * v)
smp_llsc_mb();
- if (cpu_has_llsc && R10000_LLSC_WAR) {
+ if (kernel_uses_llsc && R10000_LLSC_WAR) {
long temp;
__asm__ __volatile__(
@@ -532,7 +532,7 @@ static __inline__ long atomic64_add_return(long i, atomic64_t * v)
: "=&r" (result), "=&r" (temp), "=m" (v->counter)
: "Ir" (i), "m" (v->counter)
: "memory");
- } else if (cpu_has_llsc) {
+ } else if (kernel_uses_llsc) {
long temp;
__asm__ __volatile__(
@@ -570,7 +570,7 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t * v)
smp_llsc_mb();
- if (cpu_has_llsc && R10000_LLSC_WAR) {
+ if (kernel_uses_llsc && R10000_LLSC_WAR) {
long temp;
__asm__ __volatile__(
@@ -584,7 +584,7 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t * v)
: "=&r" (result), "=&r" (temp), "=m" (v->counter)
: "Ir" (i), "m" (v->counter)
: "memory");
- } else if (cpu_has_llsc) {
+ } else if (kernel_uses_llsc) {
long temp;
__asm__ __volatile__(
@@ -630,7 +630,7 @@ static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v)
smp_llsc_mb();
- if (cpu_has_llsc && R10000_LLSC_WAR) {
+ if (kernel_uses_llsc && R10000_LLSC_WAR) {
long temp;
__asm__ __volatile__(
@@ -648,7 +648,7 @@ static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v)
: "=&r" (result), "=&r" (temp), "=m" (v->counter)
: "Ir" (i), "m" (v->counter)
: "memory");
- } else if (cpu_has_llsc) {
+ } else if (kernel_uses_llsc) {
long temp;
__asm__ __volatile__(