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devlink: Use DIV_ROUND_UP_ULL in DEVLINK_HEALTH_SIZE_TO_BUFFERS

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When building this code on a 32-bit platform such as ARM, there is a
link time error (lld error shown, happpens with ld.bfd too):

ld.lld: error: undefined symbol: __aeabi_uldivmod
>>> referenced by devlink.c
>>>               net/core/devlink.o:(devlink_health_buffers_create) in archive built-in.a

This happens when using a regular division symbol with a u64 dividend.
Use DIV_ROUND_UP_ULL, which wraps do_div, to avoid this situation.

Fixes: cb5ccfbe73 ("devlink: Add health buffer support")
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nathan Chancellor 2019-01-21 21:23:01 -07:00 committed by David S. Miller
parent 8bbe833a65
commit 33a0efa4ba
1 changed files with 1 additions and 1 deletions
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2
net/core/devlink.c
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@ -3599,7 +3599,7 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
#define DEVLINK_HEALTH_BUFFER_SIZE (4096 - GENL_HDRLEN) #define DEVLINK_HEALTH_BUFFER_SIZE (4096 - GENL_HDRLEN)
#define DEVLINK_HEALTH_BUFFER_DATA_SIZE (DEVLINK_HEALTH_BUFFER_SIZE / 2) #define DEVLINK_HEALTH_BUFFER_DATA_SIZE (DEVLINK_HEALTH_BUFFER_SIZE / 2)
#define DEVLINK_HEALTH_SIZE_TO_BUFFERS(size) DIV_ROUND_UP(size, DEVLINK_HEALTH_BUFFER_DATA_SIZE) #define DEVLINK_HEALTH_SIZE_TO_BUFFERS(size) DIV_ROUND_UP_ULL(size, DEVLINK_HEALTH_BUFFER_DATA_SIZE)
#define DEVLINK_HEALTH_BUFFER_MAX_CHUNK 1024 #define DEVLINK_HEALTH_BUFFER_MAX_CHUNK 1024
struct devlink_health_buffer { struct devlink_health_buffer {