From: Akinobu Mita <akinobu.mita@gmail.com>
To: linux-kernel@vger.kernel.org, akpm@linux-foundation.org
Cc: Akinobu Mita <akinobu.mita@gmail.com>,
David Airlie <airlied@linux.ie>,
dri-devel@lists.freedesktop.org
Subject: [PATCH] drm: use memchr_inv()
Date: Fri, 9 Nov 2012 21:10:42 +0900 [thread overview]
Message-ID: <1352463043-9408-2-git-send-email-akinobu.mita@gmail.com> (raw)
In-Reply-To: <1352463043-9408-1-git-send-email-akinobu.mita@gmail.com>
Use memchr_inv() to check the specified memory region is filled with zero.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
---
drivers/gpu/drm/drm_edid.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index fadcd44..59260bf 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -307,12 +307,9 @@ drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf,
static bool drm_edid_is_zero(u8 *in_edid, int length)
{
- int i;
- u32 *raw_edid = (u32 *)in_edid;
+ if (memchr_inv(in_edid, 0, length))
+ return false;
- for (i = 0; i < length / 4; i++)
- if (*(raw_edid + i) != 0)
- return false;
return true;
}
--
1.7.11.7
next prev parent reply other threads:[~2012-11-09 12:11 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-09 12:10 [PATCH] drm/radeon: Use hweight32 Akinobu Mita
2012-11-09 12:10 ` Akinobu Mita [this message]
2012-11-09 12:10 ` [PATCH] drm/ttm: remove unneeded preempt_disable/enable Akinobu Mita
2012-11-14 8:54 ` Thomas Hellstrom
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