On Tue, 20 Feb 2018 05:50:43 PST (-0800), s...@shealevy.com wrote:
Signed-off-by: Shea Levy <s...@shealevy.com>
---
 arch/riscv/mm/init.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index c77df8142be2..1c832b541e95 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -66,5 +66,11 @@ void free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
+       if (start == initrd_start)
+               start = round_down(start, PAGE_SIZE);
+       if (end == initrd_end)
+               end = round_up(end, PAGE_SIZE);
+
+       free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 #endif /* CONFIG_BLK_DEV_INITRD */

It looks like everyone is doing something slightly different here:

* arm64 doesn't round to a page size, and has keep_initrd.
* arm calls poison_init_mem(), and has keep_initrd.
* sparc64 doesn't round, and doesn't have a keep_initrd.
* mips doesn't round, and doesn't have a keep_initrd.
* x86 rounds end to a page size but not start, and doesn't have a keep_initrd.

It feels like this should be something generic. I'm adding linux-kernel to see what people think.

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