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linux-user: Don't use CMSG_ALIGN(sizeof struct cmsghdr)

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The Linux struct cmsghdr is already guaranteed to be sufficiently
aligned that CMSG_ALIGN(sizeof struct cmsghdr) is always equal
to sizeof struct cmsghdr. Stop doing the unnecessary alignment
arithmetic for host and target cmsghdr.

This follows kernel commit 1ff8cebf49ed9e9ca2 and brings our
TARGET_CMSG_* macros back into line with the kernel ones,
as well as making them easier to understand.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <1513345976-22958-3-git-send-email-peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Peter Maydell 2017-12-15 13:52:56 +00:00 committed by Laurent Vivier
parent 7174970a94
commit ad762b990f
2 changed files with 5 additions and 5 deletions
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4
linux-user/syscall.c
View file

@ -1692,7 +1692,7 @@ static inline abi_long target_to_host_cmsg(struct msghdr *msgh,
void *target_data = TARGET_CMSG_DATA(target_cmsg);
int len = tswapal(target_cmsg->cmsg_len)
- TARGET_CMSG_ALIGN(sizeof (struct target_cmsghdr));
- sizeof(struct target_cmsghdr);
space += CMSG_SPACE(len);
if (space > msgh->msg_controllen) {
@ -1773,7 +1773,7 @@ static inline abi_long host_to_target_cmsg(struct target_msghdr *target_msgh,
void *data = CMSG_DATA(cmsg);
void *target_data = TARGET_CMSG_DATA(target_cmsg);
int len = cmsg->cmsg_len - CMSG_ALIGN(sizeof (struct cmsghdr));
int len = cmsg->cmsg_len - sizeof(struct cmsghdr);
int tgt_len, tgt_space;
/* We never copy a half-header but may copy half-data;

6
linux-user/syscall_defs.h
View file

@ -303,9 +303,9 @@ struct target_cmsghdr {
__target_cmsg_nxthdr(mhdr, cmsg, cmsg_start)
#define TARGET_CMSG_ALIGN(len) (((len) + sizeof (abi_long) - 1) \
& (size_t) ~(sizeof (abi_long) - 1))
#define TARGET_CMSG_SPACE(len) (TARGET_CMSG_ALIGN (len) \
+ TARGET_CMSG_ALIGN (sizeof (struct target_cmsghdr)))
#define TARGET_CMSG_LEN(len) (TARGET_CMSG_ALIGN (sizeof (struct target_cmsghdr)) + (len))
#define TARGET_CMSG_SPACE(len) (sizeof(struct target_cmsghdr) + \
TARGET_CMSG_ALIGN(len))
#define TARGET_CMSG_LEN(len) (sizeof(struct target_cmsghdr) + (len))
static __inline__ struct target_cmsghdr *
__target_cmsg_nxthdr(struct target_msghdr *__mhdr,