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x86/boot: Simplify the detect_memory*() control flow

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The return values of these functions are not used - so simplify the functions.

No change in functionality.

[ mingo: Simplified the changelog. ]

Suggested: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Jordan Borgner <mail@jordan-borgner.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20181102145622.zjx2t3mdu3rv6sgy@JordanDesktop
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Jordan Borgner 2018-11-02 14:56:22 +00:00 committed by Ingo Molnar
parent 163c8d54a9
commit e8eeb3c8aa
2 changed files with 11 additions and 22 deletions
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2
arch/x86/boot/boot.h
View File

@ -309,7 +309,7 @@ void query_edd(void);
void __attribute__((noreturn)) die(void);
/* memory.c */
int detect_memory(void);
void detect_memory(void);
/* pm.c */
void __attribute__((noreturn)) go_to_protected_mode(void);

31
arch/x86/boot/memory.c
View File

@ -17,7 +17,7 @@
#define SMAP 0x534d4150 /* ASCII "SMAP" */
static int detect_memory_e820(void)
static void detect_memory_e820(void)
{
int count = 0;
struct biosregs ireg, oreg;
@ -68,10 +68,10 @@ static int detect_memory_e820(void)
count++;
} while (ireg.ebx && count < ARRAY_SIZE(boot_params.e820_table));
return boot_params.e820_entries = count;
boot_params.e820_entries = count;
}
static int detect_memory_e801(void)
static void detect_memory_e801(void)
{
struct biosregs ireg, oreg;
@ -80,7 +80,7 @@ static int detect_memory_e801(void)
intcall(0x15, &ireg, &oreg);
if (oreg.eflags & X86_EFLAGS_CF)
return -1;
return;
/* Do we really need to do this? */
if (oreg.cx || oreg.dx) {
@ -89,7 +89,7 @@ static int detect_memory_e801(void)
}
if (oreg.ax > 15*1024) {
return -1; /* Bogus! */
return; /* Bogus! */
} else if (oreg.ax == 15*1024) {
boot_params.alt_mem_k = (oreg.bx << 6) + oreg.ax;
} else {
@ -102,11 +102,9 @@ static int detect_memory_e801(void)
*/
boot_params.alt_mem_k = oreg.ax;
}
return 0;
}
static int detect_memory_88(void)
static void detect_memory_88(void)
{
struct biosregs ireg, oreg;
@ -115,22 +113,13 @@ static int detect_memory_88(void)
intcall(0x15, &ireg, &oreg);
boot_params.screen_info.ext_mem_k = oreg.ax;
return -(oreg.eflags & X86_EFLAGS_CF); /* 0 or -1 */
}
int detect_memory(void)
void detect_memory(void)
{
int err = -1;
detect_memory_e820();
if (detect_memory_e820() > 0)
err = 0;
detect_memory_e801();
if (!detect_memory_e801())
err = 0;
if (!detect_memory_88())
err = 0;
return err;
detect_memory_88();
}