x86/boot: Disable the address-of-packed-member compiler warning
authorMatthias Kaehlcke <mka@chromium.org>
Tue, 25 Jul 2017 21:50:53 +0000 (14:50 -0700)
committerIngo Molnar <mingo@kernel.org>
Fri, 28 Jul 2017 06:39:08 +0000 (08:39 +0200)
commit20c6c189045539d29f4854d92b7ea9c329e1edfc
treed18ca4fe4d06006495b047f1d763bc4fe943bdf0
parent4ecf7191fdcc5686c1eb2b06d7f93ce29d636cf0
x86/boot: Disable the address-of-packed-member compiler warning

The clang warning 'address-of-packed-member' is disabled for the general
kernel code, also disable it for the x86 boot code.

This suppresses a bunch of warnings like this when building with clang:

./arch/x86/include/asm/processor.h:535:30: warning: taking address of
  packed member 'sp0' of class or structure 'x86_hw_tss' may result in an
  unaligned pointer value [-Waddress-of-packed-member]
    return this_cpu_read_stable(cpu_tss.x86_tss.sp0);
                                ^~~~~~~~~~~~~~~~~~~
./arch/x86/include/asm/percpu.h:391:59: note: expanded from macro
  'this_cpu_read_stable'
    #define this_cpu_read_stable(var)       percpu_stable_op("mov", var)
                                                                    ^~~
./arch/x86/include/asm/percpu.h:228:16: note: expanded from macro
  'percpu_stable_op'
    : "p" (&(var)));
             ^~~

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Cc: Doug Anderson <dianders@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170725215053.135586-1-mka@chromium.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/boot/compressed/Makefile