This is a note to let you know that I've just added the patch titled Revert "powerpc/vcpu: Assume dedicated processors as non-preempt" to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: revert-powerpc-vcpu-assume-dedicated-processors-as-non-preempt.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 40cd4c96d96eb82d9481ccb4ad7e2304e7f82a93 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Date: Wed, 1 Jan 2020 17:24:32 +0100 Subject: Revert "powerpc/vcpu: Assume dedicated processors as non-preempt" From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> This reverts commit 4ba32bdbd8c66d9c7822aea8dcf4e51410df84a8 which is commit 14c73bd344da60abaf7da3ea2e7733ddda35bbac upstream. It breaks the build. Cc: Guenter Roeck <linux@xxxxxxxxxxxx> Cc: Parth Shah <parth@xxxxxxxxxxxxx> Cc: Ihor Pasichnyk <Ihor.Pasichnyk@xxxxxxx> Cc: Juri Lelli <juri.lelli@xxxxxxxxxx> Cc: Waiman Long <longman@xxxxxxxxxx> Cc: Gautham R. Shenoy <ego@xxxxxxxxxxxxxxxxxx> Cc: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx> Cc: Phil Auld <pauld@xxxxxxxxxx> Cc: Vaidyanathan Srinivasan <svaidy@xxxxxxxxxxxxx> Cc: Parth Shah <parth@xxxxxxxxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 Patches currently in stable-queue which might be from gregkh@xxxxxxxxxxxxxxxxxxx are queue-4.19/revert-powerpc-vcpu-assume-dedicated-processors-as-non-preempt.patch