[PATCH] x86: remove superfluous initialisation in boot code.

From: Alexander van Heukelum
Date: Sun Apr 06 2008 - 08:48:13 EST


x86: remove superfluous initialisation in boot code.

In arch/x86/boot/compressed/misc.c, the variable vidmem is
the only variable that ends up in de data segment. It's also
superfluous, because the first thing the code does is:

if (RM_SCREEN_INFO.orig_video_mode == 7) {
vidmem = (char *) 0xb0000;
vidport = 0x3b4;
} else {
vidmem = (char *) 0xb8000;
vidport = 0x3d4;
}

This patch removes the initialisation.

---

Tested on qemu (i386 and x86_64). The boot messages still
appear as usual:

Decompressing Linux... Parsing ELF... done.
Booting the kernel.

Greetings,
Alexander

arch/x86/boot/compressed/misc.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 9470a05..dad4e69 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -223,7 +223,7 @@ static memptr free_mem_end_ptr;
#define HEAP_SIZE 0x4000
#endif

-static char *vidmem = (char *)0xb8000;
+static char *vidmem;
static int vidport;
static int lines, cols;

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