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, 19 insertions, 0 deletions

diff --git a/drivers/zorro/Kconfig b/drivers/zorro/Kconfig
new file mode 100644
index 000000000..41475ad46
--- /dev/null
+++ b/drivers/zorro/Kconfig
@@ -0,0 +1,19 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Zorro configuration
+#
+config ZORRO_NAMES
+	bool "Zorro device name database"
+	depends on ZORRO
+	help
+	  By default, the kernel contains a database of all known Zorro device
+	  names to make the information in /proc/iomem comprehensible to the
+	  user. This database increases the size of the kernel image by about
+	  15KB, but it gets freed after the system boots up, so it doesn't
+	  take up kernel memory. Anyway, if you are building an installation
+	  floppy or kernel for an embedded system where kernel image size
+	  really matters, you can disable this feature and you'll get device
+	  ID numbers instead of names.
+
+	  When in doubt, say Y.
+