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| author | Arnd Bergmann <arnd@arndb.de> | 2017-03-20 10:40:28 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2017-03-21 11:22:42 +0100 |
| commit | 272bce17cc3ef4629e28c38324d81ca72a862115 (patch) | |
| tree | 3dcb276aafa7b76bbaedc19c971afa23990d00bb /drivers/gpu/drm/i915/selftests | |
| parent | drm/i915: intel_engine_init_global_seqno() requires atomic kmap (diff) | |
| download | linux-272bce17cc3ef4629e28c38324d81ca72a862115.tar.xz linux-272bce17cc3ef4629e28c38324d81ca72a862115.zip | |
drm/i915: split out check for noncontiguous pfn range
We get a warning with gcc-7 about a pointless comparison when
using a linear memmap:
drivers/gpu/drm/i915/selftests/scatterlist.c: In function 'alloc_table':
drivers/gpu/drm/i915/selftests/scatterlist.c:219:66: error: self-comparison always evaluates to false [-Werror=tautological-compare]
Splitting out the comparison into a separate function avoids the warning
and makes it slightly more obvious what happens.
Fixes: 935a2f776aa5 ("drm/i915: Add some selftests for sg_table manipulation")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: http://patchwork.freedesktop.org/patch/msgid/20170320094335.1266306-2-arnd@arndb.de
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'drivers/gpu/drm/i915/selftests')
| -rw-r--r-- | drivers/gpu/drm/i915/selftests/scatterlist.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/selftests/scatterlist.c b/drivers/gpu/drm/i915/selftests/scatterlist.c index eb2cda8e2b9f..1cc5d2931753 100644 --- a/drivers/gpu/drm/i915/selftests/scatterlist.c +++ b/drivers/gpu/drm/i915/selftests/scatterlist.c @@ -189,6 +189,13 @@ static unsigned int random(unsigned long n, return 1 + (prandom_u32_state(rnd) % 1024); } +static inline bool page_contiguous(struct page *first, + struct page *last, + unsigned long npages) +{ + return first + npages == last; +} + static int alloc_table(struct pfn_table *pt, unsigned long count, unsigned long max, npages_fn_t npages_fn, @@ -216,7 +223,9 @@ static int alloc_table(struct pfn_table *pt, unsigned long npages = npages_fn(n, count, rnd); /* Nobody expects the Sparse Memmap! */ - if (pfn_to_page(pfn + npages) != pfn_to_page(pfn) + npages) { + if (!page_contiguous(pfn_to_page(pfn), + pfn_to_page(pfn + npages), + npages)) { sg_free_table(&pt->st); return -ENOSPC; } |