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author | Matthias Kaehlcke <mka@chromium.org> | 2017-05-02 01:47:41 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-27 18:07:59 +0300 |
commit | ee43aaa95604334e35dba586bbf5910984498d7d (patch) | |
tree | 466e06fc4f7d8bd147d178994fc49812b8e2dfbd /scripts/Kbuild.include | |
parent | 5039cea07546571f364b6edaefbe86213b593dd8 (diff) | |
download | linux-ee43aaa95604334e35dba586bbf5910984498d7d.tar.xz |
x86/mm/kaslr: Use the _ASM_MUL macro for multiplication to work around Clang incompatibility
commit 121843eb02a6e2fa30aefab64bfe183c97230c75 upstream.
The constraint "rm" allows the compiler to put mix_const into memory.
When the input operand is a memory location then MUL needs an operand
size suffix, since Clang can't infer the multiplication width from the
operand.
Add and use the _ASM_MUL macro which determines the operand size and
resolves to the NUL instruction with the corresponding suffix.
This fixes the following error when building with clang:
CC arch/x86/lib/kaslr.o
/tmp/kaslr-dfe1ad.s: Assembler messages:
/tmp/kaslr-dfe1ad.s:182: Error: no instruction mnemonic suffix given and no register operands; can't size instruction
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Cc: Grant Grundler <grundler@chromium.org>
Cc: Greg Hackmann <ghackmann@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Davidson <md@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170501224741.133938-1-mka@chromium.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
[nc: Apply to aslr.c in get_random_long as the kaslr shift didn't happen
until 4.8 in commit d899a7d146a2]
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'scripts/Kbuild.include')
0 files changed, 0 insertions, 0 deletions