ftrace: Synchronize the initialization of ftrace_opsgrafted

There's some internal state that ftrace_ops needs to have set, but since
it can be declared outside of the ftrace.c code, it calls
ftrace_ops_init() on the ops in every global function. The issue is that
if two tasks call it on the same ops at the same time it is possible to
have the initialization of one corrupt the initialization of the other
call.

Create a ops_mutex to use to synchronize every initialization of the
ftrace_ops. The mutex is taken within checking the ftrace_ops flag that
states it was initializied but the flag is checked again after the mutex
has been taken. Checking first outside the mutex allows it to shortcut
having to take the mutex. But then the check needs to be done again after
the mute is taken in case of races.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home
Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock")
Reported-by: sashiko-bot@kernel.org
Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 68 insertions, 0 deletions

diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile
new file mode 100644
index 000000000..d478743b5
--- /dev/null
+++ b/drivers/pci/controller/Makefile
@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_PCIE_CADENCE) += cadence/
+obj-$(CONFIG_PCI_FTPCI100) += pci-ftpci100.o
+obj-$(CONFIG_PCI_IXP4XX) += pci-ixp4xx.o
+obj-$(CONFIG_PCI_HYPERV) += pci-hyperv.o
+obj-$(CONFIG_PCI_HYPERV_INTERFACE) += pci-hyperv-intf.o
+obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
+obj-$(CONFIG_PCI_AARDVARK) += pci-aardvark.o
+obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
+obj-$(CONFIG_PCIE_TEGRA264) += pcie-tegra264.o
+obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o
+obj-$(CONFIG_PCIE_RCAR_HOST) += pcie-rcar.o pcie-rcar-host.o
+obj-$(CONFIG_PCIE_RCAR_EP) += pcie-rcar.o pcie-rcar-ep.o
+obj-$(CONFIG_PCIE_RENESAS_RZG3S_HOST) += pcie-rzg3s-host.o
+obj-$(CONFIG_PCI_HOST_COMMON) += pci-host-common.o
+obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o
+obj-$(CONFIG_PCI_HOST_THUNDER_ECAM) += pci-thunder-ecam.o
+obj-$(CONFIG_PCI_HOST_THUNDER_PEM) += pci-thunder-pem.o
+obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o
+obj-$(CONFIG_PCIE_XILINX_NWL) += pcie-xilinx-nwl.o
+obj-$(CONFIG_PCIE_XILINX_CPM) += pcie-xilinx-cpm.o
+obj-$(CONFIG_PCIE_XILINX_DMA_PL) += pcie-xilinx-dma-pl.o
+obj-$(CONFIG_PCI_V3_SEMI) += pci-v3-semi.o
+obj-$(CONFIG_PCI_XGENE) += pci-xgene.o
+obj-$(CONFIG_PCI_XGENE_MSI) += pci-xgene-msi.o
+obj-$(CONFIG_PCI_VERSATILE) += pci-versatile.o
+obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o
+obj-$(CONFIG_PCIE_IPROC_MSI) += pcie-iproc-msi.o
+obj-$(CONFIG_PCIE_IPROC_PLATFORM) += pcie-iproc-platform.o
+obj-$(CONFIG_PCIE_IPROC_BCMA) += pcie-iproc-bcma.o
+obj-$(CONFIG_PCIE_ALTERA) += pcie-altera.o
+obj-$(CONFIG_PCIE_ALTERA_MSI) += pcie-altera-msi.o
+obj-$(CONFIG_PCIE_ROCKCHIP) += pcie-rockchip.o
+obj-$(CONFIG_PCIE_ROCKCHIP_EP) += pcie-rockchip-ep.o
+obj-$(CONFIG_PCIE_ROCKCHIP_HOST) += pcie-rockchip-host.o
+obj-$(CONFIG_PCIE_MEDIATEK) += pcie-mediatek.o
+obj-$(CONFIG_PCIE_MEDIATEK_GEN3) += pcie-mediatek-gen3.o
+obj-$(CONFIG_VMD) += vmd.o
+obj-$(CONFIG_PCIE_BRCMSTB) += pcie-brcmstb.o
+obj-$(CONFIG_PCI_LOONGSON) += pci-loongson.o
+obj-$(CONFIG_PCIE_HISI_ERR) += pcie-hisi-error.o
+obj-$(CONFIG_PCIE_APPLE) += pcie-apple.o
+obj-$(CONFIG_PCIE_MT7621) += pcie-mt7621.o
+obj-$(CONFIG_PCIE_ASPEED) += pcie-aspeed.o
+
+# pcie-hisi.o quirks are needed even without CONFIG_PCIE_DW
+obj-y				+= dwc/
+obj-y				+= mobiveil/
+obj-y				+= plda/
+
+
+# The following drivers are for devices that use the generic ACPI
+# pci_root.c driver but don't support standard ECAM config access.
+# They contain MCFG quirks to replace the generic ECAM accessors with
+# device-specific ones that are shared with the DT driver.
+
+# The ACPI driver is generic and should not require driver-specific
+# config options to be enabled, so we always build these drivers on
+# ARM64 and use internal ifdefs to only build the pieces we need
+# depending on whether ACPI, the DT driver, or both are enabled.
+
+ifdef CONFIG_ACPI
+ifdef CONFIG_PCI_QUIRKS
+obj-$(CONFIG_ARM64) += pci-thunder-ecam.o
+obj-$(CONFIG_ARM64) += pci-thunder-pem.o
+obj-$(CONFIG_ARM64) += pci-xgene.o
+endif
+endif