powerpc: Eliminate unused do_gtod variable

Since we started using the generic timekeeping code, we haven't had a
powerpc-specific version of do_gettimeofday, and hence there is now
nothing that reads the do_gtod variable in arch/powerpc/kernel/time.c.
This therefore removes it and the code that sets it.

Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h
index febd581ec9b047a01b1ff67425fef02375e34b50..27ccb764fdaba84518d5e7eadaa50ae4ed06513b 100644 (file)
--- a/arch/powerpc/include/asm/time.h
+++ b/arch/powerpc/include/asm/time.h
@@ -48,26 +48,6 @@ extern unsigned long ppc_proc_freq;
 extern unsigned long ppc_tb_freq;
 #define DEFAULT_TB_FREQ                125000000UL
 
-/*
- * By putting all of this stuff into a single struct we 
- * reduce the number of cache lines touched by do_gettimeofday.
- * Both by collecting all of the data in one cache line and
- * by touching only one TOC entry on ppc64.
- */
-struct gettimeofday_vars {
-       u64 tb_to_xs;
-       u64 stamp_xsec;
-       u64 tb_orig_stamp;
-};
-
-struct gettimeofday_struct {
-       unsigned long tb_ticks_per_sec;
-       struct gettimeofday_vars vars[2];
-       struct gettimeofday_vars * volatile varp;
-       unsigned      var_idx;
-       unsigned      tb_to_us;
-};
-
 struct div_result {
        u64 result_high;
        u64 result_low;

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 8389c5be149cea83a4267b0923f93162259fc753..e1f3a51404292ee3c422295e47292da9b7c22256 100644 (file)
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -164,8 +164,6 @@ static u64 tb_to_ns_scale __read_mostly;
 static unsigned tb_to_ns_shift __read_mostly;
 static unsigned long boot_tb __read_mostly;
 
-static struct gettimeofday_struct do_gtod;
-
 extern struct timezone sys_tz;
 static long timezone_offset;
 
@@ -415,31 +413,9 @@ void udelay(unsigned long usecs)
 }
 EXPORT_SYMBOL(udelay);
 
-
-/*
- * There are two copies of tb_to_xs and stamp_xsec so that no
- * lock is needed to access and use these values in
- * do_gettimeofday.  We alternate the copies and as long as a
- * reasonable time elapses between changes, there will never
- * be inconsistent values.  ntpd has a minimum of one minute
- * between updates.
- */
 static inline void update_gtod(u64 new_tb_stamp, u64 new_stamp_xsec,
                               u64 new_tb_to_xs)
 {
-       unsigned temp_idx;
-       struct gettimeofday_vars *temp_varp;
-
-       temp_idx = (do_gtod.var_idx == 0);
-       temp_varp = &do_gtod.vars[temp_idx];
-
-       temp_varp->tb_to_xs = new_tb_to_xs;
-       temp_varp->tb_orig_stamp = new_tb_stamp;
-       temp_varp->stamp_xsec = new_stamp_xsec;
-       smp_mb();
-       do_gtod.varp = temp_varp;
-       do_gtod.var_idx = temp_idx;
-
        /*
         * tb_update_count is used to allow the userspace gettimeofday code
         * to assure itself that it sees a consistent view of the tb_to_xs and
@@ -515,9 +491,7 @@ static int __init iSeries_tb_recal(void)
                                tb_ticks_per_sec   = new_tb_ticks_per_sec;
                                calc_cputime_factors();
                                div128_by_32( XSEC_PER_SEC, 0, tb_ticks_per_sec, &divres );
-                               do_gtod.tb_ticks_per_sec = tb_ticks_per_sec;
                                tb_to_xs = divres.result_low;
-                               do_gtod.varp->tb_to_xs = tb_to_xs;
                                vdso_data->tb_ticks_per_sec = tb_ticks_per_sec;
                                vdso_data->tb_to_xs = tb_to_xs;
                        }
@@ -989,15 +963,6 @@ void __init time_init(void)
                sys_tz.tz_dsttime = 0;
         }
 
-       do_gtod.varp = &do_gtod.vars[0];
-       do_gtod.var_idx = 0;
-       do_gtod.varp->tb_orig_stamp = tb_last_jiffy;
-       __get_cpu_var(last_jiffy) = tb_last_jiffy;
-       do_gtod.varp->stamp_xsec = (u64) xtime.tv_sec * XSEC_PER_SEC;
-       do_gtod.tb_ticks_per_sec = tb_ticks_per_sec;
-       do_gtod.varp->tb_to_xs = tb_to_xs;
-       do_gtod.tb_to_us = tb_to_us;
-
        vdso_data->tb_orig_stamp = tb_last_jiffy;
        vdso_data->tb_update_count = 0;
        vdso_data->tb_ticks_per_sec = tb_ticks_per_sec;