diff options
| author | Stefan Wahren <stefan.wahren@i2se.com> | 2022-01-23 21:02:08 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-25 16:30:15 +0100 |
| commit | 9c78a73a5fd3aff694ddcaeefdae4ec78a3573be (patch) | |
| tree | 3cac11ff20e8e0f737479c3be48643851c6efb05 /drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c | |
| parent | e1a17ce82f1808182338707be5aa5eda6a6144f3 (diff) | |
staging: vchiq_arm: introduce is_adjacent_block
The check for an adjacent block is hard to read. So move it into a separate
inline function.
Reviewed-by: Nicolas Saenz Julienne <nsaenz@kernel.org>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://lore.kernel.org/r/1642968143-19281-4-git-send-email-stefan.wahren@i2se.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c')
| -rw-r--r-- | drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c index 6759a6261500..974804447935 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c @@ -189,6 +189,20 @@ cleanup_pagelistinfo(struct vchiq_pagelist_info *pagelistinfo) pagelistinfo->pagelist, pagelistinfo->dma_addr); } +static inline bool +is_adjacent_block(u32 *addrs, u32 addr, unsigned int k) +{ + u32 tmp; + + if (!k) + return false; + + tmp = (addrs[k - 1] & PAGE_MASK) + + (((addrs[k - 1] & ~PAGE_MASK) + 1) << PAGE_SHIFT); + + return tmp == (addr & PAGE_MASK); +} + /* There is a potential problem with partial cache lines (pages?) * at the ends of the block when reading. If the CPU accessed anything in * the same line (page?) then it may have pulled old data into the cache, @@ -349,10 +363,7 @@ create_pagelist(char *buf, char __user *ubuf, WARN_ON(len == 0); WARN_ON(i && (i != (dma_buffers - 1)) && (len & ~PAGE_MASK)); WARN_ON(i && (addr & ~PAGE_MASK)); - if (k > 0 && - ((addrs[k - 1] & PAGE_MASK) + - (((addrs[k - 1] & ~PAGE_MASK) + 1) << PAGE_SHIFT)) - == (addr & PAGE_MASK)) + if (is_adjacent_block(addrs, addr, k)) addrs[k - 1] += ((len + PAGE_SIZE - 1) >> PAGE_SHIFT); else addrs[k++] = (addr & PAGE_MASK) | |