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| author | John Ogness <john.ogness@linutronix.de> | 2020-09-14 14:33:50 +0200 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2020-09-15 15:44:49 +0200 |
| commit | e3bc0401c1de2feb15601685b85b4dea45130386 (patch) | |
| tree | 4382d0415d7f72a7fb9a9cde0ebe4f80573e871e /kernel/printk | |
| parent | printk: ringbuffer: relocate get_data() (diff) | |
| download | linux-e3bc0401c1de2feb15601685b85b4dea45130386.tar.xz linux-e3bc0401c1de2feb15601685b85b4dea45130386.zip | |
printk: ringbuffer: add BLK_DATALESS() macro
Rather than continually needing to explicitly check @begin and @next
to identify a dataless block, introduce and use a BLK_DATALESS()
macro.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20200914123354.832-3-john.ogness@linutronix.de
Diffstat (limited to 'kernel/printk')
| -rw-r--r-- | kernel/printk/printk_ringbuffer.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/printk/printk_ringbuffer.c b/kernel/printk/printk_ringbuffer.c index 664552cb931c..195e6f4d4df6 100644 --- a/kernel/printk/printk_ringbuffer.c +++ b/kernel/printk/printk_ringbuffer.c @@ -266,6 +266,8 @@ /* Determine if a logical position refers to a data-less block. */ #define LPOS_DATALESS(lpos) ((lpos) & 1UL) +#define BLK_DATALESS(blk) (LPOS_DATALESS((blk)->begin) && \ + LPOS_DATALESS((blk)->next)) /* Get the logical position at index 0 of the current wrap. */ #define DATA_THIS_WRAP_START_LPOS(data_ring, lpos) \ @@ -1038,7 +1040,7 @@ static unsigned int space_used(struct prb_data_ring *data_ring, struct prb_data_blk_lpos *blk_lpos) { /* Data-less blocks take no space. */ - if (LPOS_DATALESS(blk_lpos->begin)) + if (BLK_DATALESS(blk_lpos)) return 0; if (DATA_WRAPS(data_ring, blk_lpos->begin) == DATA_WRAPS(data_ring, blk_lpos->next)) { @@ -1071,7 +1073,7 @@ static const char *get_data(struct prb_data_ring *data_ring, struct prb_data_block *db; /* Data-less data block description. */ - if (LPOS_DATALESS(blk_lpos->begin) && LPOS_DATALESS(blk_lpos->next)) { + if (BLK_DATALESS(blk_lpos)) { if (blk_lpos->begin == NO_LPOS && blk_lpos->next == NO_LPOS) { *data_size = 0; return ""; |