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| author | Andrew Lunn <andrew@lunn.ch> | 2012-06-05 08:52:34 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-12 16:20:17 -0700 |
| commit | 6ebb017de9d59a18c3ff9648270e8f6abaa93438 (patch) | |
| tree | 771410dbbeec9cba3629b27336b2eb4af30b58b1 | |
| parent | bcc2c9c3fff859e0eb019fe6fec26f9b8eba795c (diff) | |
| download | linux-6ebb017de9d59a18c3ff9648270e8f6abaa93438.tar.bz2 | |
printk: Fix alignment of buf causing crash on ARM EABI
Commit 7ff9554bb578ba02166071d2d487b7fc7d860d62, printk: convert
byte-buffer to variable-length record buffer, causes systems using
EABI to crash very early in the boot cycle. The first entry in struct
log is a u64, which for EABI must be 8 byte aligned.
Make use of __alignof__() so the compiler to decide the alignment, but
allow it to be overridden using CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS,
for systems which can perform unaligned access and want to save
a few bytes of space.
Tested on Orion5x and Kirkwood.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: Kay Sievers <kay@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/printk.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/printk.c b/kernel/printk.c index 32462d2b364a..f205c25c37e2 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -227,10 +227,10 @@ static u32 clear_idx; #define LOG_LINE_MAX 1024 /* record buffer */ -#if !defined(CONFIG_64BIT) || defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) +#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) #define LOG_ALIGN 4 #else -#define LOG_ALIGN 8 +#define LOG_ALIGN __alignof__(struct log) #endif #define __LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT) static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN); |