linux-kernel - [PATCH 4.19 073/114] Revert "powerpc/vcpu: Assume dedicated processors as non-preempt"

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Message-Id: <20200102220036.470720283@linuxfoundation.org>
Date:   Thu,  2 Jan 2020 23:07:25 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        Parth Shah <parth@...ux.ibm.com>,
        Ihor Pasichnyk <Ihor.Pasichnyk@....com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Waiman Long <longman@...hat.com>,
        "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Phil Auld <pauld@...hat.com>,
        Vaidyanathan Srinivasan <svaidy@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.19 073/114] Revert "powerpc/vcpu: Assume dedicated processors as non-preempt"

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

This reverts commit 4ba32bdbd8c66d9c7822aea8dcf4e51410df84a8 which is
commit 14c73bd344da60abaf7da3ea2e7733ddda35bbac upstream.

It breaks the build.

Cc: Guenter Roeck <linux@...ck-us.net>
Cc: Parth Shah <parth@...ux.ibm.com>
Cc: Ihor Pasichnyk <Ihor.Pasichnyk@....com>
Cc: Juri Lelli <juri.lelli@...hat.com>
Cc: Waiman Long <longman@...hat.com>
Cc: Gautham R. Shenoy <ego@...ux.vnet.ibm.com>
Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: Phil Auld <pauld@...hat.com>
Cc: Vaidyanathan Srinivasan <svaidy@...ux.ibm.com>
Cc: Parth Shah <parth@...ux.ibm.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -53,12 +53,10 @@
 #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
@@ -75,9 +75,6 @@
 #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);
@@ -764,10 +761,6 @@ 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