linux-kernel - [PATCH v2 6/6] RISC-V: Implement keepinitrd kernel parameter

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Date:   Sat, 19 Jan 2019 13:28:59 +0000
From:   Anup Patel <Anup.Patel@....com>
To:     Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>
CC:     Atish Patra <Atish.Patra@....com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Christoph Hellwig <hch@...radead.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 6/6] RISC-V: Implement keepinitrd kernel parameter

This patch implements keepinitrd kernel parameter. By default,
keepinitrd=1 but users can pass "keepinitrd=0" to free-up
initrd memory at boot-time in free_initrd_mem() function.

The keepinitrd kernel parameter is already implemented by
unicore32, arm, and arm64 architectures and it is documented
at: Documentation/admin-guide/kernel-parameters.txt

Signed-off-by: Anup Patel <anup.patel@....com>
---
 arch/riscv/kernel/setup.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index 9cd583b6d1cd..46e547dd8245 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -97,8 +97,20 @@ static void __init setup_initrd(void)
 	initrd_end = 0;
 }
 
-void free_initrd_mem(unsigned long start, unsigned long end)
+static int keep_initrd __initdata;
+
+static int __init keepinitrd_setup(char *__unused)
+{
+	keep_initrd = 1;
+	return 1;
+}
+
+__setup("keepinitrd", keepinitrd_setup);
+
+void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
+	if (!keep_initrd)
+		memblock_free(__pa(start), end - start);
 }
 #endif /* CONFIG_BLK_DEV_INITRD */
 
-- 
2.17.1