Reviewed-by: Richard Lyu <[email protected]>
On 2025/11/21 14:36, Thomas Zimmermann wrote:
> Replace usage of global screen_info with local pointers. This will
> later reduce churn when screen_info is being moved.
>
> Signed-off-by: Thomas Zimmermann <[email protected]>
> ---
> drivers/firmware/efi/earlycon.c | 40 ++++++++++++++++-----------------
> 1 file changed, 20 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/firmware/efi/earlycon.c b/drivers/firmware/efi/earlycon.c
> index d18a1a5de144..fac3a295c57f 100644
> --- a/drivers/firmware/efi/earlycon.c
> +++ b/drivers/firmware/efi/earlycon.c
> @@ -32,12 +32,13 @@ static void *efi_fb;
> */
> static int __init efi_earlycon_remap_fb(void)
> {
> + const struct screen_info *si = &screen_info;
> +
> /* bail if there is no bootconsole or it was unregistered already */
> if (!earlycon_console || !console_is_registered(earlycon_console))
> return 0;
>
> - efi_fb = memremap(fb_base, screen_info.lfb_size,
> - fb_wb ? MEMREMAP_WB : MEMREMAP_WC);
> + efi_fb = memremap(fb_base, si->lfb_size, fb_wb ? MEMREMAP_WB :
> MEMREMAP_WC);
>
> return efi_fb ? 0 : -ENOMEM;
> }
> @@ -71,12 +72,12 @@ static __ref void efi_earlycon_unmap(void *addr, unsigned
> long len)
> early_memunmap(addr, len);
> }
>
> -static void efi_earlycon_clear_scanline(unsigned int y)
> +static void efi_earlycon_clear_scanline(unsigned int y, const struct
> screen_info *si)
> {
> unsigned long *dst;
> u16 len;
>
> - len = screen_info.lfb_linelength;
> + len = si->lfb_linelength;
> dst = efi_earlycon_map(y*len, len);
> if (!dst)
> return;
> @@ -85,7 +86,7 @@ static void efi_earlycon_clear_scanline(unsigned int y)
> efi_earlycon_unmap(dst, len);
> }
>
> -static void efi_earlycon_scroll_up(void)
> +static void efi_earlycon_scroll_up(const struct screen_info *si)
> {
> unsigned long *dst, *src;
> u16 maxlen = 0;
> @@ -99,8 +100,8 @@ static void efi_earlycon_scroll_up(void)
> }
> maxlen *= 4;
>
> - len = screen_info.lfb_linelength;
> - height = screen_info.lfb_height;
> + len = si->lfb_linelength;
> + height = si->lfb_height;
>
> for (i = 0; i < height - font->height; i++) {
> dst = efi_earlycon_map(i*len, len);
> @@ -120,7 +121,8 @@ static void efi_earlycon_scroll_up(void)
> }
> }
>
> -static void efi_earlycon_write_char(u32 *dst, unsigned char c, unsigned int
> h)
> +static void efi_earlycon_write_char(u32 *dst, unsigned char c, unsigned int
> h,
> + const struct screen_info *si)
> {
> const u32 color_black = 0x00000000;
> const u32 color_white = 0x00ffffff;
> @@ -145,13 +147,12 @@ static void efi_earlycon_write_char(u32 *dst, unsigned
> char c, unsigned int h)
> static void
> efi_earlycon_write(struct console *con, const char *str, unsigned int num)
> {
> - struct screen_info *si;
> + const struct screen_info *si = &screen_info;
> u32 cur_efi_x = efi_x;
> unsigned int len;
> const char *s;
> void *dst;
>
> - si = &screen_info;
> len = si->lfb_linelength;
>
> while (num) {
> @@ -174,7 +175,7 @@ efi_earlycon_write(struct console *con, const char *str,
> unsigned int num)
> x = efi_x;
>
> while (n-- > 0) {
> - efi_earlycon_write_char(dst + x*4, *s, h);
> + efi_earlycon_write_char(dst + x*4, *s, h, si);
> x += font->width;
> s++;
> }
> @@ -207,10 +208,10 @@ efi_earlycon_write(struct console *con, const char
> *str, unsigned int num)
> cur_line_y = (cur_line_y + 1) % max_line_y;
>
> efi_y -= font->height;
> - efi_earlycon_scroll_up();
> + efi_earlycon_scroll_up(si);
>
> for (i = 0; i < font->height; i++)
> - efi_earlycon_clear_scanline(efi_y + i);
> + efi_earlycon_clear_scanline(efi_y + i, si);
> }
> }
> }
> @@ -226,22 +227,21 @@ void __init efi_earlycon_reprobe(void)
> static int __init efi_earlycon_setup(struct earlycon_device *device,
> const char *opt)
> {
> - struct screen_info *si;
> + const struct screen_info *si = &screen_info;
> u16 xres, yres;
> u32 i;
>
> fb_wb = opt && !strcmp(opt, "ram");
>
> - if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) {
> + if (si->orig_video_isVGA != VIDEO_TYPE_EFI) {
> fb_probed = true;
> return -ENODEV;
> }
>
> - fb_base = screen_info.lfb_base;
> - if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
> - fb_base |= (u64)screen_info.ext_lfb_base << 32;
> + fb_base = si->lfb_base;
> + if (si->capabilities & VIDEO_CAPABILITY_64BIT_BASE)
> + fb_base |= (u64)si->ext_lfb_base << 32;
>
> - si = &screen_info;
> xres = si->lfb_width;
> yres = si->lfb_height;
>
> @@ -266,7 +266,7 @@ static int __init efi_earlycon_setup(struct
> earlycon_device *device,
>
> efi_y -= font->height;
> for (i = 0; i < (yres - efi_y) / font->height; i++)
> - efi_earlycon_scroll_up();
> + efi_earlycon_scroll_up(si);
>
> device->con->write = efi_earlycon_write;
> earlycon_console = device->con;
> --
> 2.51.1
>
>
