[PATCH] i386: pit_latch_buggy has no effect (f5e88615) · Commits · 戴 / test

Eliminated the arch/i386/kernel/timers in 2.6.18, use clocksoures instead. pit_latch_buggy was referred in timers/timer_tsc.c, and currently removed. Therefore nobody refer it. Until 2.6.17, MediaGX's TSC works correctly. after 2.6.18, warned "TSC appears to be running slowly. Marking it as unstable". So marked unstable TSC when CS55x0. Cc: Andi Kleen <ak@suse.de> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Andi Kleen <ak@suse.de>

arch/i386/kernel/cpu/cyrix.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -279,7 +279,7 @@ static void __cpuinit init_cyrix(struct cpuinfo_x86 *c)
		*/
		if (vendor == PCI_VENDOR_ID_CYRIX &&
		(device == PCI_DEVICE_ID_CYRIX_5510 \|\| device == PCI_DEVICE_ID_CYRIX_5520))
		pit_latch_buggy = 1;
		mark_tsc_unstable();
		}
		#endif
		c->x86_cache_size=16; /* Yep 16K integrated cache thats it */

arch/i386/kernel/time.c

+0 −2

Original line number	Diff line number	Diff line
		@@ -70,8 +70,6 @@

		#include <asm/i8259.h>

		int pit_latch_buggy; /* extern */

		#include "do_timer.h"

		unsigned int cpu_khz; /* Detected as we calibrate the TSC */

include/asm-i386/timer.h

+0 −2

Original line number	Diff line number	Diff line
		@@ -9,8 +9,6 @@ void setup_pit_timer(void);
		unsigned long long native_sched_clock(void);
		unsigned long native_calculate_cpu_khz(void);

		/* Modifiers for buggy PIT handling */
		extern int pit_latch_buggy;
		extern int timer_ack;
		extern int no_timer_check;
		extern int no_sync_cmos_clock;

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