linux-kernel - [PATCH v2] RISC-V: Add fragmented config for debug options

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Date:   Thu, 5 Dec 2019 17:49:18 +0000
From:   Anup Patel <Anup.Patel@....com>
To:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>
CC:     Atish Patra <Atish.Patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        Christoph Hellwig <hch@....de>,
        Anup Patel <anup@...infault.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Anup Patel <Anup.Patel@....com>
Subject: [PATCH v2] RISC-V: Add fragmented config for debug options

Various Linux kernel DEBUG options have big performance impact so
these should not be enabled in RISC-V normal defconfigs.

Instead we should have separate RISC-V fragmented config for enabling
these DEBUG options. This way Linux RISC-V kernel can be built for
both non-debug and debug purposes using same defconfig.

This patch moves additional DEBUG options to extra_debug.config.

To configure a non-debug RV64 kernel, we use our normal defconfig:
   $ make O=<linux_build_directory> defconfig
Wherease to configure a debug RV64 kernel, we use extra_debug.config:
   $ make O=<linux_build_directory> defconfig extra_debug.config

Signed-off-by: Anup Patel <anup.patel@....com>
---
Changes since v1:
 - Use fragmented .config instead of separate debug defconfigs.
---
 arch/riscv/configs/defconfig          | 23 -----------------------
 arch/riscv/configs/extra_debug.config | 21 +++++++++++++++++++++
 arch/riscv/configs/rv32_defconfig     | 23 -----------------------
 3 files changed, 21 insertions(+), 46 deletions(-)
 create mode 100644 arch/riscv/configs/extra_debug.config

diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig
index e2ff95cb3390..f0710d8f50cc 100644
--- a/arch/riscv/configs/defconfig
+++ b/arch/riscv/configs/defconfig
@@ -101,27 +101,4 @@ CONFIG_CRYPTO_USER_API_HASH=y
 CONFIG_CRYPTO_DEV_VIRTIO=y
 CONFIG_PRINTK_TIME=y
 CONFIG_DEBUG_FS=y
-CONFIG_DEBUG_PAGEALLOC=y
-CONFIG_DEBUG_VM=y
-CONFIG_DEBUG_VM_PGFLAGS=y
-CONFIG_DEBUG_MEMORY_INIT=y
-CONFIG_DEBUG_PER_CPU_MAPS=y
-CONFIG_SOFTLOCKUP_DETECTOR=y
-CONFIG_WQ_WATCHDOG=y
-CONFIG_SCHED_STACK_END_CHECK=y
-CONFIG_DEBUG_TIMEKEEPING=y
-CONFIG_DEBUG_RT_MUTEXES=y
-CONFIG_DEBUG_SPINLOCK=y
-CONFIG_DEBUG_MUTEXES=y
-CONFIG_DEBUG_RWSEMS=y
-CONFIG_DEBUG_ATOMIC_SLEEP=y
-CONFIG_STACKTRACE=y
-CONFIG_DEBUG_LIST=y
-CONFIG_DEBUG_PLIST=y
-CONFIG_DEBUG_SG=y
 # CONFIG_RCU_TRACE is not set
-CONFIG_RCU_EQS_DEBUG=y
-CONFIG_DEBUG_BLOCK_EXT_DEVT=y
-# CONFIG_FTRACE is not set
-# CONFIG_RUNTIME_TESTING_MENU is not set
-CONFIG_MEMTEST=y
diff --git a/arch/riscv/configs/extra_debug.config b/arch/riscv/configs/extra_debug.config
new file mode 100644
index 000000000000..66c58bb645a4
--- /dev/null
+++ b/arch/riscv/configs/extra_debug.config
@@ -0,0 +1,21 @@
+CONFIG_DEBUG_PAGEALLOC=y
+CONFIG_DEBUG_VM=y
+CONFIG_DEBUG_VM_PGFLAGS=y
+CONFIG_DEBUG_MEMORY_INIT=y
+CONFIG_DEBUG_PER_CPU_MAPS=y
+CONFIG_SOFTLOCKUP_DETECTOR=y
+CONFIG_WQ_WATCHDOG=y
+CONFIG_SCHED_STACK_END_CHECK=y
+CONFIG_DEBUG_TIMEKEEPING=y
+CONFIG_DEBUG_RT_MUTEXES=y
+CONFIG_DEBUG_SPINLOCK=y
+CONFIG_DEBUG_MUTEXES=y
+CONFIG_DEBUG_RWSEMS=y
+CONFIG_DEBUG_ATOMIC_SLEEP=y
+CONFIG_STACKTRACE=y
+CONFIG_DEBUG_LIST=y
+CONFIG_DEBUG_PLIST=y
+CONFIG_DEBUG_SG=y
+CONFIG_RCU_EQS_DEBUG=y
+CONFIG_DEBUG_BLOCK_EXT_DEVT=y
+CONFIG_MEMTEST=y
diff --git a/arch/riscv/configs/rv32_defconfig b/arch/riscv/configs/rv32_defconfig
index eb519407c841..bdec58e6c5f7 100644
--- a/arch/riscv/configs/rv32_defconfig
+++ b/arch/riscv/configs/rv32_defconfig
@@ -98,27 +98,4 @@ CONFIG_CRYPTO_USER_API_HASH=y
 CONFIG_CRYPTO_DEV_VIRTIO=y
 CONFIG_PRINTK_TIME=y
 CONFIG_DEBUG_FS=y
-CONFIG_DEBUG_PAGEALLOC=y
-CONFIG_DEBUG_VM=y
-CONFIG_DEBUG_VM_PGFLAGS=y
-CONFIG_DEBUG_MEMORY_INIT=y
-CONFIG_DEBUG_PER_CPU_MAPS=y
-CONFIG_SOFTLOCKUP_DETECTOR=y
-CONFIG_WQ_WATCHDOG=y
-CONFIG_SCHED_STACK_END_CHECK=y
-CONFIG_DEBUG_TIMEKEEPING=y
-CONFIG_DEBUG_RT_MUTEXES=y
-CONFIG_DEBUG_SPINLOCK=y
-CONFIG_DEBUG_MUTEXES=y
-CONFIG_DEBUG_RWSEMS=y
-CONFIG_DEBUG_ATOMIC_SLEEP=y
-CONFIG_STACKTRACE=y
-CONFIG_DEBUG_LIST=y
-CONFIG_DEBUG_PLIST=y
-CONFIG_DEBUG_SG=y
 # CONFIG_RCU_TRACE is not set
-CONFIG_RCU_EQS_DEBUG=y
-CONFIG_DEBUG_BLOCK_EXT_DEVT=y
-# CONFIG_FTRACE is not set
-# CONFIG_RUNTIME_TESTING_MENU is not set
-CONFIG_MEMTEST=y
-- 
2.17.1