Before invoking the arch specific handler, efi_mem_reserve() reserves
the given memory region through memblock.
efi_mem_reserve() can get called after mm_init() though -- through
efi_bgrt_init(), for example. After mm_init(), memblock is dead and should
not be used anymore.
Let efi_mem_reserve() check whether memblock is dead and not do the
reservation if so. Emit a warning from the generic efi_arch mem_reserve()
in this case: if the architecture doesn't provide any other means of
registering the region as reserved, the operation would be a nop.
Fixes: 4bc9f92e64c8 ("x86/efi-bgrt: Use efi_mem_reserve() to avoid copying image data")
Signed-off-by: Nicolai Stange <nicstange@xxxxxxxxx>
---
Changes to v1:
Change the if condition from slab_is_available() to !slab_is_available
as pointed out by Mika Penttilä at
http://lkml.kernel.org/r/c7bf34ba-56f0-8346-36d1-7069f2115dcf@xxxxxxxxxxxx
drivers/firmware/efi/efi.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 92914801e388..158a8df2f4af 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -403,7 +403,10 @@ u64 __init efi_mem_desc_end(efi_memory_desc_t *md)
return end;
}
-void __init __weak efi_arch_mem_reserve(phys_addr_t addr, u64 size) {}
+void __init __weak efi_arch_mem_reserve(phys_addr_t addr, u64 size)
+{
+ WARN(slab_is_available(), "efi_mem_reserve() has no effect");
+}
/**
* efi_mem_reserve - Reserve an EFI memory region
@@ -419,7 +422,7 @@ void __init __weak efi_arch_mem_reserve(phys_addr_t addr, u64 size) {}
*/
void __init efi_mem_reserve(phys_addr_t addr, u64 size)
{
- if (!memblock_is_region_reserved(addr, size))
+ if (!slab_is_available() && !memblock_is_region_reserved(addr, size))
memblock_reserve(addr, size);
/*
--
2.11.0
--
To unsubscribe from this list: send the line "unsubscribe linux-efi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
