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05 April 2024, 19:05:47 UTC
Revision 20c6c189045539d29f4854d92b7ea9c329e1edfc authored by Matthias Kaehlcke on 25 July 2017, 21:50:53 UTC, committed by Ingo Molnar on 28 July 2017, 06:39:08 UTC 
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>
1 parent 4ecf719
Raw File
Tip revision: 20c6c189045539d29f4854d92b7ea9c329e1edfc authored by Matthias Kaehlcke on 25 July 2017, 21:50:53 UTC
x86/boot: Disable the address-of-packed-member compiler warning
Tip revision: 20c6c18
headers_install.sh 
#!/bin/sh

if [ $# -lt 2 ]
then
	echo "Usage: headers_install.sh OUTDIR SRCDIR [FILES...]"
	echo
	echo "Prepares kernel header files for use by user space, by removing"
	echo "all compiler.h definitions and #includes, removing any"
	echo "#ifdef __KERNEL__ sections, and putting __underscores__ around"
	echo "asm/inline/volatile keywords."
	echo
	echo "OUTDIR: directory to write each userspace header FILE to."
	echo "SRCDIR: source directory where files are picked."
	echo "FILES:  list of header files to operate on."

	exit 1
fi

# Grab arguments

OUTDIR="$1"
shift
SRCDIR="$1"
shift

# Iterate through files listed on command line

FILE=
trap 'rm -f "$OUTDIR/$FILE" "$OUTDIR/$FILE.sed"' EXIT
for i in "$@"
do
	FILE="$(basename "$i")"
	sed -r \
		-e 's/([ \t(])(__user|__force|__iomem)[ \t]/\1/g' \
		-e 's/__attribute_const__([ \t]|$)/\1/g' \
		-e 's@^#include <linux/compiler.h>@@' \
		-e 's/(^|[^a-zA-Z0-9])__packed([^a-zA-Z0-9_]|$)/\1__attribute__((packed))\2/g' \
		-e 's/(^|[ \t(])(inline|asm|volatile)([ \t(]|$)/\1__\2__\3/g' \
		-e 's@#(ifndef|define|endif[ \t]*/[*])[ \t]*_UAPI@#\1 @' \
		"$SRCDIR/$i" > "$OUTDIR/$FILE.sed" || exit 1
	scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__ "$OUTDIR/$FILE.sed" \
		> "$OUTDIR/$FILE"
	[ $? -gt 1 ] && exit 1
	rm -f "$OUTDIR/$FILE.sed"
done
trap - EXIT
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