On Fri, Jul 21, 2017 at 2:00 PM, Tom Rini trini@konsulko.com wrote:
On Fri, Jul 21, 2017 at 07:28:42PM +0300, Denis Pynkin wrote:
PXE boot is broken with GCC 7.1 due option '-fstore-merging' enabled by default for '-O2':
BOOTP broadcast 1 data abort pc : [<8ff8bb30>] lr : [<00004f1f>] reloc pc : [<17832b30>] lr : [<878abf1f>] sp : 8f558bc0 ip : 00000000 fp : 8ffef5a4 r10: 8ffed248 r9 : 8f558ee0 r8 : 8ffef594 r7 : 0000000e r6 : 8ffed700 r5 : 00000000 r4 : 8ffed74e r3 : 00060101 r2 : 8ffed230 r1 : 8ffed706 r0 : 00000ddd Flags: nzcv IRQs off FIQs off Mode SVC_32 Resetting CPU ...
Core reason is usage of structures for network headers without packed attribute.
Reviewed-by: Yauheni Kaliuta yauheni.kaliuta@redhat.com Signed-off-by: Denis Pynkin denis.pynkin@collabora.com
include/net.h | 14 +++++++------- net/bootp.h | 2 +- net/dns.h | 2 +- net/nfs.h | 2 +- net/sntp.h | 2 +- 5 files changed, 11 insertions(+), 11 deletions(-)
So, what I've been wondering, and others have poked me about (who can chime in if they like), how is the kernel not also tripping over this?
Great question.