80 lines
3.3 KiB
Diff
80 lines
3.3 KiB
Diff
From 7217f43a5aaf863ebd4df662f4d2453562c8721a Mon Sep 17 00:00:00 2001
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Message-Id: <7217f43a5aaf863ebd4df662f4d2453562c8721a.1601675151.git.zanussi@kernel.org>
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In-Reply-To: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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References: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Wed, 14 Dec 2011 01:03:49 +0100
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Subject: [PATCH 037/333] cpumask: Disable CONFIG_CPUMASK_OFFSTACK for RT
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.148-rt64.tar.xz
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There are "valid" GFP_ATOMIC allocations such as
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|BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:931
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|in_atomic(): 1, irqs_disabled(): 0, pid: 2130, name: tar
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|1 lock held by tar/2130:
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| #0: (&mm->mmap_sem){++++++}, at: [<ffffffff811d4e89>] SyS_brk+0x39/0x190
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|Preemption disabled at:[<ffffffff81063048>] flush_tlb_mm_range+0x28/0x350
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|CPU: 1 PID: 2130 Comm: tar Tainted: G W 4.8.2-rt2+ #747
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|Call Trace:
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| [<ffffffff814d52dc>] dump_stack+0x86/0xca
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| [<ffffffff810a26fb>] ___might_sleep+0x14b/0x240
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| [<ffffffff819bc1d4>] rt_spin_lock+0x24/0x60
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| [<ffffffff81194fba>] get_page_from_freelist+0x83a/0x11b0
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| [<ffffffff81195e8b>] __alloc_pages_nodemask+0x15b/0x1190
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| [<ffffffff811f0b81>] alloc_pages_current+0xa1/0x1f0
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| [<ffffffff811f7df5>] new_slab+0x3e5/0x690
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| [<ffffffff811fb0d5>] ___slab_alloc+0x495/0x660
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| [<ffffffff811fb311>] __slab_alloc.isra.79+0x71/0xc0
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| [<ffffffff811fb447>] __kmalloc_node+0xe7/0x240
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| [<ffffffff814d4ee0>] alloc_cpumask_var_node+0x20/0x50
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| [<ffffffff814d4f3e>] alloc_cpumask_var+0xe/0x10
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| [<ffffffff810430c1>] native_send_call_func_ipi+0x21/0x130
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| [<ffffffff8111c13f>] smp_call_function_many+0x22f/0x370
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| [<ffffffff81062b64>] native_flush_tlb_others+0x1a4/0x3a0
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| [<ffffffff8106309b>] flush_tlb_mm_range+0x7b/0x350
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| [<ffffffff811c88e2>] tlb_flush_mmu_tlbonly+0x62/0xd0
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| [<ffffffff811c9af4>] tlb_finish_mmu+0x14/0x50
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| [<ffffffff811d1c84>] unmap_region+0xe4/0x110
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| [<ffffffff811d3db3>] do_munmap+0x293/0x470
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| [<ffffffff811d4f8c>] SyS_brk+0x13c/0x190
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| [<ffffffff810032e2>] do_fast_syscall_32+0xb2/0x2f0
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| [<ffffffff819be181>] entry_SYSENTER_compat+0x51/0x60
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which forbid allocations at run-time.
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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arch/x86/Kconfig | 2 +-
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lib/Kconfig | 1 +
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2 files changed, 2 insertions(+), 1 deletion(-)
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diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
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index af35f5caadbe..e40ba59efe7f 100644
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--- a/arch/x86/Kconfig
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+++ b/arch/x86/Kconfig
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@@ -934,7 +934,7 @@ config CALGARY_IOMMU_ENABLED_BY_DEFAULT
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config MAXSMP
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bool "Enable Maximum number of SMP Processors and NUMA Nodes"
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depends on X86_64 && SMP && DEBUG_KERNEL
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- select CPUMASK_OFFSTACK
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+ select CPUMASK_OFFSTACK if !PREEMPT_RT_FULL
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---help---
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Enable maximum number of CPUS and NUMA Nodes for this architecture.
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If unsure, say N.
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diff --git a/lib/Kconfig b/lib/Kconfig
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index a3928d4438b5..a50b2158f7cd 100644
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--- a/lib/Kconfig
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+++ b/lib/Kconfig
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@@ -441,6 +441,7 @@ config CHECK_SIGNATURE
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config CPUMASK_OFFSTACK
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bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
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+ depends on !PREEMPT_RT_FULL
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help
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Use dynamic allocation for cpumask_var_t, instead of putting
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them on the stack. This is a bit more expensive, but avoids
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--
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2.17.1
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