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From:   Anup Patel <Anup.Patel@wdc.com>
To:     Palmer Dabbelt <palmer@sifive.com>,
        Albert Ou <aou@eecs.berkeley.edu>
CC:     Atish Patra <Atish.Patra@wdc.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Christoph Hellwig <hch@infradead.org>,
        "linux-riscv@lists.infradead.org" <linux-riscv@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Anup Patel <Anup.Patel@wdc.com>
Subject: [PATCH v2 6/6] RISC-V: Implement keepinitrd kernel parameter
Thread-Topic: [PATCH v2 6/6] RISC-V: Implement keepinitrd kernel parameter
Thread-Index: AQHUr/rvNlD18fFOHEuGvgVx64rC4Q==
Date:   Sat, 19 Jan 2019 13:28:59 +0000
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This patch implements keepinitrd kernel parameter. By default,
keepinitrd=3D1 but users can pass "keepinitrd=3D0" 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@wdc.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 =3D 0;
 }
=20
-void free_initrd_mem(unsigned long start, unsigned long end)
+static int keep_initrd __initdata;
+
+static int __init keepinitrd_setup(char *__unused)
+{
+	keep_initrd =3D 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 */
=20
--=20
2.17.1