diff options
| author | Stephen Warren <swarren@nvidia.com> | 2012-05-10 16:14:33 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-05-10 15:36:59 -0700 |
| commit | f8450fca6ecdea38b5a882fdf6cd097e3ec8651c (patch) | |
| tree | bd304f4638508c8a6879798384199b994cbb6c04 /kernel/printk.c | |
| parent | af4681097b23fe9c63a03d774de7c742fa3a920e (diff) | |
| download | linux-f8450fca6ecdea38b5a882fdf6cd097e3ec8651c.tar.bz2 | |
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>
Diffstat (limited to 'kernel/printk.c')
| -rw-r--r-- | kernel/printk.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/kernel/printk.c b/kernel/printk.c index 572941d7e5f7..8b027bdf4606 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -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, |