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x86/of: Unconditionally call unflatten_and_copy_device_tree()

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Call this function unconditionally so that we can populate an empty DTB
on platforms that don't boot with a firmware provided or builtin DTB.
There's no harm in calling unflatten_device_tree() unconditionally here.
If there isn't a non-NULL 'initial_boot_params' pointer then
unflatten_device_tree() returns early.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: x86@kernel.org
Cc: H. Peter Anvin <hpa@zytor.com>
Tested-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20240217010557.2381548-5-sboyd@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Stephen Boyd 2024-02-16 17:05:53 -08:00 committed by Rob Herring
parent 221a819aa3
commit 40f18dbbb4
1 changed files with 13 additions and 11 deletions
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24
arch/x86/kernel/devicetree.c
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@ -283,22 +283,24 @@ void __init x86_flattree_get_config(void)
u32 size, map_len;
void *dt;
if (!initial_dtb)
return;
if (initial_dtb) {
map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
dt = early_memremap(initial_dtb, map_len);
size = fdt_totalsize(dt);
if (map_len < size) {
early_memunmap(dt, map_len);
dt = early_memremap(initial_dtb, size);
map_len = size;
}
dt = early_memremap(initial_dtb, map_len);
size = fdt_totalsize(dt);
if (map_len < size) {
early_memunmap(dt, map_len);
dt = early_memremap(initial_dtb, size);
map_len = size;
early_init_dt_verify(dt);
}
early_init_dt_verify(dt);
unflatten_and_copy_device_tree();
early_memunmap(dt, map_len);
if (initial_dtb)
early_memunmap(dt, map_len);
}
#endif