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x86/ioremap: Fix CONFIG_EFI=n build

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commit 870b4333a62e45b0b2000d14b301b7b8b8cad9da upstream.

In order to use efi_mem_type(), one needs CONFIG_EFI enabled. Otherwise
that function is undefined. Use IS_ENABLED() to check and avoid the
ifdeffery as the compiler optimizes away the following unreachable code
then.

Fixes: 985e537a4082 ("x86/ioremap: Map EFI runtime services data as encrypted for SEV")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/7561e981-0d9b-d62c-0ef2-ce6007aff1ab@infradead.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Borislav Petkov 2020-03-18 19:27:48 +01:00 • committed by Greg Kroah-Hartman
commit 94a4104bf1
1 changed files with 3 additions and 0 deletions
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3
arch/x86/mm/ioremap.c
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@ -115,6 +115,9 @@ static void __ioremap_check_other(resource_size_t addr, struct ioremap_desc *des
if (!sev_active())
return;
if (!IS_ENABLED(CONFIG_EFI))
return;
if (efi_mem_type(addr) == EFI_RUNTIME_SERVICES_DATA)
desc->flags |= IORES_MAP_ENCRYPTED;
}