Commit e60a1fec authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Will Deacon

ARM: kvm: implement replacement for ld's LOG2CEIL()

Commit 06f75a1f ("ARM, arm64: kvm: get rid of the bounce
page") uses ld's builtin function LOG2CEIL() to align the
KVM init code to a log2 upper bound of its size. However,
this function turns out to be a fairly recent addition to
binutils, which breaks the build for older toolchains.

So instead, implement a replacement LOG2_ROUNDUP() using
the C preprocessor.
Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 06f75a1f
......@@ -12,6 +12,26 @@
#include <asm/pgtable.h>
#endif
/*
* Poor man's version of LOG2CEIL(), which is
* not available in binutils before v2.24.
*/
#define LOG2_ROUNDUP(size) ( \
__LOG2_ROUNDUP(size, 2) \
__LOG2_ROUNDUP(size, 3) \
__LOG2_ROUNDUP(size, 4) \
__LOG2_ROUNDUP(size, 5) \
__LOG2_ROUNDUP(size, 6) \
__LOG2_ROUNDUP(size, 7) \
__LOG2_ROUNDUP(size, 8) \
__LOG2_ROUNDUP(size, 9) \
__LOG2_ROUNDUP(size, 10) \
__LOG2_ROUNDUP(size, 11) \
12)
#define __LOG2_ROUNDUP(size, order) \
(size) <= (1 << order) ? order :
#define PROC_INFO \
. = ALIGN(4); \
VMLINUX_SYMBOL(__proc_info_begin) = .; \
......@@ -23,7 +43,7 @@
VMLINUX_SYMBOL(__idmap_text_start) = .; \
*(.idmap.text) \
VMLINUX_SYMBOL(__idmap_text_end) = .; \
. = ALIGN(1 << LOG2CEIL(__hyp_idmap_size)); \
. = ALIGN(1 << LOG2_ROUNDUP(__hyp_idmap_size)); \
VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \
*(.hyp.idmap.text) \
VMLINUX_SYMBOL(__hyp_idmap_text_end) = .;
......
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