linux-kernel - [PATCH v1] uml: make CONFIG_STATIC

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Date:   Tue, 10 Dec 2019 13:21:08 -0800
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     jdike@...toit.com, richard@....at, anton.ivanov@...bridgegreys.com
Cc:     johannes.berg@...el.com, linux-um@...ts.infradead.org,
        linux-kernel@...r.kernel.org, davidgow@...gle.com,
        Brendan Higgins <brendanhiggins@...gle.com>
Subject: [PATCH v1] uml: make CONFIG_STATIC_LINK actually static

Currently, CONFIG_STATIC_LINK can be enabled with options which cannot
be statically linked, namely UML_NET_VECTOR, UML_NET_VDE, and
UML_NET_PCAP; this is because glibc tries to load NSS which does not
support being statically linked. So make CONFIG_STATIC_LINK depend on
!UML_NET_VECTOR && !UML_NET_VDE && !UML_NET_PCAP.

Link: https://lore.kernel.org/lkml/f658f317-be54-ed75-8296-c373c2dcc697@cambridgegreys.com/#t
Signed-off-by: Brendan Higgins <brendanhiggins@...gle.com>
---
 arch/um/Kconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index 2a6d04fcb3e91..1ddc8745123f2 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -63,6 +63,7 @@ source "arch/$(HEADER_ARCH)/um/Kconfig"
 
 config STATIC_LINK
 	bool "Force a static link"
+	depends on !UML_NET_VECTOR && !UML_NET_VDE && !UML_NET_PCAP
 	default n
 	help
 	  This option gives you the ability to force a static link of UML.
@@ -72,6 +73,9 @@ config STATIC_LINK
 	  Additionally, this option enables using higher memory spaces (up to
 	  2.75G) for UML.
 
+	  NOTE: This option is incompatible with some networking features which
+	  depend on features that require being dynamically loaded (like NSS).
+
 config LD_SCRIPT_STATIC
 	bool
 	default y
-- 
2.24.0.525.g8f36a354ae-goog