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authorMichael Ellerman <michael@ellerman.id.au>2005-11-04 12:09:42 +1100
committerMichael Ellerman <michael@ellerman.id.au>2005-11-04 12:09:42 +1100
commitb8f510219edc719d4c305918e16edc578bcfc16f (patch)
tree7f0303abf4ce15d1f35516ee36fc8aebc270db6d /arch
parent40765d2b8b86446b4ac8ec880cf4fdf56ce4ae7e (diff)
powerpc: Implement smp_release_cpus() in C not asm
There's no reason for smp_release_cpus() to be asm, and most people can make more sense of C code. Add an extern declaration to smp.h and remove the custom one in machine_kexec.c Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kernel/head_64.S18
-rw-r--r--arch/powerpc/kernel/setup_64.c23
-rw-r--r--arch/ppc64/kernel/head.S18
-rw-r--r--arch/ppc64/kernel/machine_kexec.c1
4 files changed, 21 insertions, 39 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index ba30e3177b0..45d81976987 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -1914,24 +1914,6 @@ _GLOBAL(hmt_start_secondary)
blr
#endif
-#if defined(CONFIG_KEXEC) || defined(CONFIG_SMP)
-_GLOBAL(smp_release_cpus)
- /* All secondary cpus are spinning on a common
- * spinloop, release them all now so they can start
- * to spin on their individual paca spinloops.
- * For non SMP kernels, the secondary cpus never
- * get out of the common spinloop.
- * XXX This does nothing useful on iSeries, secondaries are
- * already waiting on their paca.
- */
- li r3,1
- LOADADDR(r5,__secondary_hold_spinloop)
- std r3,0(r5)
- sync
- blr
-#endif /* CONFIG_SMP */
-
-
/*
* We put a few things here that have to be page-aligned.
* This stuff goes at the beginning of the bss, which is page-aligned.
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index d4a3c5dd1a2..275d86ddd61 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -103,8 +103,6 @@ extern void htab_initialize(void);
extern void early_init_devtree(void *flat_dt);
extern void unflatten_device_tree(void);
-extern void smp_release_cpus(void);
-
int have_of = 1;
int boot_cpuid = 0;
int boot_cpuid_phys = 0;
@@ -400,6 +398,27 @@ void __init early_setup(unsigned long dt_ptr)
}
+#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
+void smp_release_cpus(void)
+{
+ extern unsigned long __secondary_hold_spinloop;
+
+ DBG(" -> smp_release_cpus()\n");
+
+ /* All secondary cpus are spinning on a common spinloop, release them
+ * all now so they can start to spin on their individual paca
+ * spinloops. For non SMP kernels, the secondary cpus never get out
+ * of the common spinloop.
+ * This is useless but harmless on iSeries, secondaries are already
+ * waiting on their paca spinloops. */
+
+ __secondary_hold_spinloop = 1;
+ mb();
+
+ DBG(" <- smp_release_cpus()\n");
+}
+#endif /* CONFIG_SMP || CONFIG_KEXEC */
+
/*
* Initialize some remaining members of the ppc64_caches and systemcfg structures
* (at least until we get rid of them completely). This is mostly some
diff --git a/arch/ppc64/kernel/head.S b/arch/ppc64/kernel/head.S
index 0b65efe1682..db1cf397be2 100644
--- a/arch/ppc64/kernel/head.S
+++ b/arch/ppc64/kernel/head.S
@@ -1914,24 +1914,6 @@ _GLOBAL(hmt_start_secondary)
blr
#endif
-#if defined(CONFIG_KEXEC) || defined(CONFIG_SMP)
-_GLOBAL(smp_release_cpus)
- /* All secondary cpus are spinning on a common
- * spinloop, release them all now so they can start
- * to spin on their individual paca spinloops.
- * For non SMP kernels, the secondary cpus never
- * get out of the common spinloop.
- * XXX This does nothing useful on iSeries, secondaries are
- * already waiting on their paca.
- */
- li r3,1
- LOADADDR(r5,__secondary_hold_spinloop)
- std r3,0(r5)
- sync
- blr
-#endif /* CONFIG_SMP */
-
-
/*
* We put a few things here that have to be page-aligned.
* This stuff goes at the beginning of the bss, which is page-aligned.
diff --git a/arch/ppc64/kernel/machine_kexec.c b/arch/ppc64/kernel/machine_kexec.c
index bf7cc4f8210..ff8679f260f 100644
--- a/arch/ppc64/kernel/machine_kexec.c
+++ b/arch/ppc64/kernel/machine_kexec.c
@@ -244,7 +244,6 @@ static void kexec_prepare_cpus(void)
static void kexec_prepare_cpus(void)
{
- extern void smp_release_cpus(void);
/*
* move the secondarys to us so that we can copy
* the new kernel 0-0x100 safely