From 82bdfde43e0334138c6888f74533728dc124fef5 Mon Sep 17 00:00:00 2001 From: Denis Pynkin Date: Fri, 21 Jul 2017 19:28:42 +0300 Subject: net: Use packed structures for networking 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 Signed-off-by: Denis Pynkin Acked-by: Joe Hershberger (cherry picked from commit 704f3acfcf55343043bbed01c5fb0a0094a68e8a) Signed-off-by: Joel Stanley --- net/bootp.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/bootp.h') diff --git a/net/bootp.h b/net/bootp.h index fcb0a64e61..567340ec5d 100644 --- a/net/bootp.h +++ b/net/bootp.h @@ -49,7 +49,7 @@ struct bootp_hdr { char bp_sname[64]; /* Server host name */ char bp_file[128]; /* Boot file name */ char bp_vend[OPT_FIELD_SIZE]; /* Vendor information */ -}; +} __attribute__((packed)); #define BOOTP_HDR_SIZE sizeof(struct bootp_hdr) -- cgit v1.2.1