linux-kernel - [PATCH] ARM: imx_v6_v7_defconfig: Explicitly restore CONFIG_DEBUG

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Message-ID: <49b2579b9ad2e5ce0a7c4b163dffb5a885ac7dae.1495797565.git.leonard.crestez@nxp.com>
Date:   Fri, 26 May 2017 14:26:06 +0300
From:   Leonard Crestez <leonard.crestez@....com>
To:     Shawn Guo <shawnguo@...nel.org>
CC:     Fabio Estevam <fabio.estevam@....com>,
        Dong Aisheng <aisheng.dong@....com>,
        <linux-arm-kernel@...ts.infradead.org>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Octavian Purdila <octavian.purdila@....com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] ARM: imx_v6_v7_defconfig: Explicitly restore CONFIG_DEBUG_FS

This option was removed by "make savedefconfig" in
commit c5054a98bce4 ("ARM: imx_v6_v7_defconfig: Select SMSC_PHY")

This happened because CONFIG_DEBUG_FS was implicitly selected by
CONFIG_TREE_RCU_TRACE which defaulted to true because CONFIG_RCU_TRACE
was enabled by default by commit 961518259b3b ("rcu: Enable RCU
tracepoints by default to aid in debugging")

Recently however CONFIG_RCU_TRACE was completely removed by
commit 6e74c237c410 ("rcu: Remove debugfs tracing")

The result is that imx_v6_v7_defconfig no longer includes DEBUG_FS on
linux-next since next-20170517. This is bad, DEBUG_FS is extremely
useful for kernel introspection and testing.

Signed-off-by: Leonard Crestez <leonard.crestez@....com>
---

Patch is against next-20170526. Applying it to shawnguo/imx/defconfig
and cycling via savedefconfig makes this diff go away.

Alternatively maybe DEBUG_FS itself could be made "default y if DEBUG_KERNEL"
or similar?

 arch/arm/configs/imx_v6_v7_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/configs/imx_v6_v7_defconfig b/arch/arm/configs/imx_v6_v7_defconfig
index bf1e7e3..51ca814 100644
--- a/arch/arm/configs/imx_v6_v7_defconfig
+++ b/arch/arm/configs/imx_v6_v7_defconfig
@@ -381,6 +381,7 @@ CONFIG_NLS_ISO8859_1=y
 CONFIG_NLS_ISO8859_15=m
 CONFIG_NLS_UTF8=y
 CONFIG_PRINTK_TIME=y
+CONFIG_DEBUG_FS=y
 CONFIG_MAGIC_SYSRQ=y
 # CONFIG_SCHED_DEBUG is not set
 CONFIG_PROVE_LOCKING=y
-- 
2.7.4