lkml.org 
[lkml]   [2020]   [Mar]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5.4 070/123] drm/i915: be more solid in checking the alignment
Date
From: Matthew Auld <matthew.auld@intel.com>

commit 1d61c5d711a2dc0b978ae905535edee9601f9449 upstream.

The alignment is u64, and yet is_power_of_2() assumes unsigned long,
which might give different results between 32b and 64b kernel.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200305203534.210466-1-matthew.auld@intel.com
Cc: stable@vger.kernel.org
(cherry picked from commit 2920516b2f719546f55079bc39a7fe409d9e80ab)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 3 ++-
drivers/gpu/drm/i915/i915_utils.h | 5 +++++
2 files changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -439,7 +439,8 @@ eb_validate_vma(struct i915_execbuffer *
if (unlikely(entry->flags & eb->invalid_flags))
return -EINVAL;

- if (unlikely(entry->alignment && !is_power_of_2(entry->alignment)))
+ if (unlikely(entry->alignment &&
+ !is_power_of_2_u64(entry->alignment)))
return -EINVAL;

/*
--- a/drivers/gpu/drm/i915/i915_utils.h
+++ b/drivers/gpu/drm/i915/i915_utils.h
@@ -233,6 +233,11 @@ static inline u64 ptr_to_u64(const void
__idx; \
})

+static inline bool is_power_of_2_u64(u64 n)
+{
+ return (n != 0 && ((n & (n - 1)) == 0));
+}
+
static inline void __list_del_many(struct list_head *head,
struct list_head *first)
{

\
 
 \ /
  Last update: 2020-03-17 12:20    [W:1.521 / U:0.072 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site