Hi

Am 02.02.24 um 19:00 schrieb Sui Jingfeng:

Hi,


On 2024/2/2 19:58, Thomas Zimmermann wrote:

quoted

+static inline void __screen_info_set_lfb_base(struct screen_info 
*si, u64 lfb_base)
+{
+    si->lfb_base = lfb_base & GENMASK_ULL(31, 0);
+    si->ext_lfb_base = (lfb_base & GENMASK_ULL(63, 32)) >> 32;

I want to ask a trivial question: why not simply write it like below?

si->lfb_base = (u32)lfb_base;

si->ext_lfb_base = lfb_base >> 32;

I'm asking because I feel it is a little bit complicated.

Admittedly it's a bit verbose. I've written it like this so that it's 
clear which bits go where.

Best regards
Thomas

quoted

+    if (si->ext_lfb_base)
+        si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
+    else
+        si->capabilities &= ~VIDEO_CAPABILITY_64BIT_BASE;
+}
+

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)