linux-kernel - [RFC v1 1/2] kbuild: add arch specific dependency for BTF support

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Message-Id: <20200127193549.187419-2-brendanhiggins@google.com>
Date:   Mon, 27 Jan 2020 11:35:48 -0800
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     jdike@...toit.com, richard@....at, anton.ivanov@...bridgegreys.com,
        akpm@...ux-foundation.org, changbin.du@...el.com,
        yamada.masahiro@...ionext.com, rdunlap@...radead.org,
        keescook@...omium.org, andriy.shevchenko@...ux.intel.com
Cc:     linux-um@...ts.infradead.org, linux-kernel@...r.kernel.org,
        davidgow@...gle.com, heidifahim@...gle.com,
        Brendan Higgins <brendanhiggins@...gle.com>
Subject: [RFC v1 1/2] kbuild: add arch specific dependency for BTF support

Some archs (like UM) do not build with CONFIG_DEBUG_INFO_BTF=y, so add
an options for archs to select to opt-in or out of BTF typeinfo support.

Signed-off-by: Brendan Higgins <brendanhiggins@...gle.com>
---
 lib/Kconfig.debug | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index e4676b992eae9..f5bcb391f1b7d 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -238,9 +238,12 @@ config DEBUG_INFO_DWARF4
 	  But it significantly improves the success of resolving
 	  variables in gdb on optimized code.
 
+config ARCH_NO_BTF_TYPEINFO
+	bool
+
 config DEBUG_INFO_BTF
 	bool "Generate BTF typeinfo"
-	depends on DEBUG_INFO
+	depends on DEBUG_INFO && !ARCH_NO_BTF_TYPEINFO
 	help
 	  Generate deduplicated BTF type information from DWARF debug info.
 	  Turning this on expects presence of pahole tool, which will convert
-- 
2.25.0.341.g760bfbb309-goog