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printk: correctly align __log_buf 

__log_buf must be aligned, because a 64-bit value is written directly
to it as part of struct log. Alignment of the log entries is typically
handled by log_store(), but this only triggers for subsequent entries,
not the very first (or wrapped) entries.

Cc: Kay Sievers <kay@vrfy.org>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Warren 2012-05-10 16:14:33 -06:00 committed by Greg Kroah-Hartman
parent af4681097b
commit f8450fca6e
1 changed files with 6 additions and 7 deletions
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13
kernel/printk.c
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@ -227,8 +227,13 @@ static u32 clear_idx;
#define LOG_LINE_MAX 1024
/* record buffer */
#if !defined(CONFIG_64BIT) || defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
#define LOG_ALIGN 4
#else
#define LOG_ALIGN 8
#endif
#define __LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT)
static char __log_buf[__LOG_BUF_LEN];
static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN);
static char *log_buf = __log_buf;
static u32 log_buf_len = __LOG_BUF_LEN;
@ -279,12 +284,6 @@ static u32 log_next(u32 idx)
return idx + msg->len;
}
#if !defined(CONFIG_64BIT) || defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
#define LOG_ALIGN 4
#else
#define LOG_ALIGN 8
#endif
/* insert record into the buffer, discard old ones, update heads */
static void log_store(int facility, int level,
const char *dict, u16 dict_len,