From 4d207133e9c362bc05a3bb6701d63eeb75cc4b77 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <ben@decadent.org.uk>
Date: Thu, 27 Aug 2015 12:51:45 -0500
Subject: [PATCH] gfs2: Make statistics unsigned, suitable for use with
do_div()
None of these statistics can meaningfully be negative, and the
numerator for do_div() must have the type u64. The generic
implementation of do_div() used on some 32-bit architectures asserts
that, resulting in a compiler error in gfs2_rgrp_congested().
Fixes: 0166b197c2ed ("GFS2: Average in only non-zero round-trip times ...")
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Acked-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/gfs2/glock.c | 22 +++++++++++-----------
fs/gfs2/incore.h | 2 +-
fs/gfs2/rgrp.c | 8 ++++----
fs/gfs2/trace_gfs2.h | 16 ++++++++--------
4 files changed, 24 insertions(+), 24 deletions(-)
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index edb15eeb0ad55..37d4db1ac0b27 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1680,17 +1680,17 @@ static int gfs2_glstats_seq_show(struct seq_file *seq, void *iter_ptr)
{
struct gfs2_glock *gl = iter_ptr;
- seq_printf(seq, "G: n:%u/%llx rtt:%lld/%lld rttb:%lld/%lld irt:%lld/%lld dcnt: %lld qcnt: %lld\n",
+ seq_printf(seq, "G: n:%u/%llx rtt:%llu/%llu rttb:%llu/%llu irt:%llu/%llu dcnt: %llu qcnt: %llu\n",
gl->gl_name.ln_type,
(unsigned long long)gl->gl_name.ln_number,
- (long long)gl->gl_stats.stats[GFS2_LKS_SRTT],
- (long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR],
- (long long)gl->gl_stats.stats[GFS2_LKS_SRTTB],
- (long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB],
- (long long)gl->gl_stats.stats[GFS2_LKS_SIRT],
- (long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR],
- (long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT],
- (long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]);
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTT],
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR],
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTB],
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB],
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRT],
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR],
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT],
+ (unsigned long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]);
return 0;
}
@@ -1727,7 +1727,7 @@ static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr)
loff_t pos = *(loff_t *)iter_ptr;
unsigned index = pos >> 3;
unsigned subindex = pos & 0x07;
- s64 value;
+ u64 value;
int i;
if (index == 0 && subindex != 0)
@@ -1743,7 +1743,7 @@ static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr)
} else {
value = lkstats->lkstats[index - 1].stats[subindex];
}
- seq_printf(seq, " %15lld", (long long)value);
+ seq_printf(seq, " %15llu", (long long)value);
}
seq_putc(seq, '\n');
return 0;
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index e300f74190906..121ed08d9d9f9 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -244,7 +244,7 @@ enum {
};
struct gfs2_lkstats {
- s64 stats[GFS2_NR_LKSTATS];
+ u64 stats[GFS2_NR_LKSTATS];
};
enum {
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index c92ae7fd36f38..475985d14758c 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1862,11 +1862,11 @@ static bool gfs2_rgrp_congested(const struct gfs2_rgrpd *rgd, int loops)
const struct gfs2_glock *gl = rgd->rd_gl;
const struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct gfs2_lkstats *st;
- s64 r_dcount, l_dcount;
- s64 l_srttb, a_srttb = 0;
+ u64 r_dcount, l_dcount;
+ u64 l_srttb, a_srttb = 0;
s64 srttb_diff;
- s64 sqr_diff;
- s64 var;
+ u64 sqr_diff;
+ u64 var;
int cpu, nonzero = 0;
preempt_disable();
diff --git a/fs/gfs2/trace_gfs2.h b/fs/gfs2/trace_gfs2.h
index fff47d0e0ef55..49ac55da4e334 100644
--- a/fs/gfs2/trace_gfs2.h
+++ b/fs/gfs2/trace_gfs2.h
@@ -267,14 +267,14 @@ TRACE_EVENT(gfs2_glock_lock_time,
__field( int, status )
__field( char, flags )
__field( s64, tdiff )
- __field( s64, srtt )
- __field( s64, srttvar )
- __field( s64, srttb )
- __field( s64, srttvarb )
- __field( s64, sirt )
- __field( s64, sirtvar )
- __field( s64, dcount )
- __field( s64, qcount )
+ __field( u64, srtt )
+ __field( u64, srttvar )
+ __field( u64, srttb )
+ __field( u64, srttvarb )
+ __field( u64, sirt )
+ __field( u64, sirtvar )
+ __field( u64, dcount )
+ __field( u64, qcount )
),
TP_fast_assign(
--
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