[PATCH 5.4 130/191] Revert "powerpc/vcpu: Assume dedicated processors as non-preempt"

Greg Kroah-Hartman
2020-01-02T22:58:01Z

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

This reverts commit 8332dbe5157a0056d8ab409957dfa89930066d87 which is
commit 14c73bd344da60abaf7da3ea2e7733ddda35bbac upstream.

It breaks the build.

Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Parth Shah <parth@linux.ibm.com>
Cc: Ihor Pasichnyk <Ihor.Pasichnyk@ibm.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Waiman Long <longman@redhat.com>
Cc: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Phil Auld <pauld@redhat.com>
Cc: Vaidyanathan Srinivasan <svaidy@linux.ibm.com>
Cc: Parth Shah <parth@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/powerpc/include/asm/spinlock.h | 4 +---
arch/powerpc/platforms/pseries/setup.c | 7 -------
2 files changed, 1 insertion(+), 10 deletions(-)

--- a/arch/powerpc/include/asm/spinlock.h
+++ b/arch/powerpc/include/asm/spinlock.h
@@ -36,12 +36,10 @@
#endif

#ifdef CONFIG_PPC_PSERIES
-DECLARE_STATIC_KEY_FALSE(shared_processor);
-
#define vcpu_is_preempted vcpu_is_preempted
static inline bool vcpu_is_preempted(int cpu)
{
- if (!static_branch_unlikely(&shared_processor))
+ if (!firmware_has_feature(FW_FEATURE_SPLPAR))
return false;
return !!(be32_to_cpu(lppaca_of(cpu).yield_count) & 1);
}
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -74,9 +74,6 @@
#include "pseries.h"
#include "../../../../drivers/pci/pci.h"

-DEFINE_STATIC_KEY_FALSE(shared_processor);
-EXPORT_SYMBOL_GPL(shared_processor);
-
int CMO_PrPSP = -1;
int CMO_SecPSP = -1;
unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K);
@@ -761,10 +758,6 @@ static void __init pSeries_setup_arch(vo

if (firmware_has_feature(FW_FEATURE_LPAR)) {
vpa_init(boot_cpuid);
-
- if (lppaca_shared_proc(get_lppaca()))
- static_branch_enable(&shared_processor);
-
ppc_md.power_save = pseries_lpar_idle;
ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
#ifdef CONFIG_PCI_IOV