KVM: Don't pre-reserve xarray entries when storing empty/NULL attributesgrafted

Skip the xarray reservation loop when clearing all memory attributes, as
storing NULL only erases the entry and never needs to allocate, so no
reservation (and no cleanup of a failed one) is required in that case.

Suggested-by: Sean Christopherson <seanjc@google.com>
Cc: David Ballesteros <davimaba.v@proton.me>
Signed-off-by: Zeng Chi <zengchi@kylinos.cn>
Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com
[sean: split to separate patch]
Signed-off-by: Sean Christopherson <seanjc@google.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/pinctrl/berlin/Kconfig b/drivers/pinctrl/berlin/Kconfig
new file mode 100644
index 000000000..9b1644d1d
--- /dev/null
+++ b/drivers/pinctrl/berlin/Kconfig
@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: GPL-2.0-only
+if (ARCH_BERLIN || COMPILE_TEST)
+
+config PINCTRL_BERLIN
+	bool
+	select PINMUX
+	select REGMAP_MMIO
+
+config PINCTRL_AS370
+	bool "Synaptics as370 pin controller driver"
+	depends on OF
+	select PINCTRL_BERLIN
+
+config PINCTRL_BERLIN_BG2
+	def_bool MACH_BERLIN_BG2
+	depends on OF
+	select PINCTRL_BERLIN
+
+config PINCTRL_BERLIN_BG2CD
+	def_bool MACH_BERLIN_BG2CD
+	depends on OF
+	select PINCTRL_BERLIN
+
+config PINCTRL_BERLIN_BG2Q
+	def_bool MACH_BERLIN_BG2Q
+	depends on OF
+	select PINCTRL_BERLIN
+
+config PINCTRL_BERLIN_BG4CT
+	bool "Marvell berlin4ct pin controller driver"
+	depends on OF
+	select PINCTRL_BERLIN
+
+endif