Probaility has a useful range of 0 to 100.
Verbose has a useful range of 0 to 2.
Reduce them both from unsigned long to unsigned char. Since there
was already a hole they can fit into, this saves 16 bytes.
There's one consequential fix required: i915 selftests set the
probability to 999 for some reason, which had the same effect as
100. Leaving it alone would have worked with a compiler warning
(999 % 256 = 231 is also >= 100, so would have the same effect),
but it seemed better to clean it up.
Signed-off-by: George Spelvin <lkml@xxxxxxx>
Cc: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
---
drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 2 +-
include/linux/fault-inject.h | 4 ++--
lib/fault-inject.c | 10 +++++-----
3 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index 3f7e80fb3bbd1..3342e3c0ec10b 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -901,7 +901,7 @@ static int shrink_hole(struct drm_i915_private *i915,
unsigned long prime;
int err;
- vm->fault_attr.probability = 999;
+ vm->fault_attr.probability = 100;
atomic_set(&vm->fault_attr.times, -1);
for_each_prime_number_from(prime, 0, ULONG_MAX - 1) {
diff --git a/include/linux/fault-inject.h b/include/linux/fault-inject.h
index e525f6957c49f..094dd7d2a2ce6 100644
--- a/include/linux/fault-inject.h
+++ b/include/linux/fault-inject.h
@@ -14,11 +14,11 @@
* Documentation/fault-injection/fault-injection.rst
*/
struct fault_attr {
- unsigned long probability;
unsigned long interval;
atomic_t times;
atomic_t space;
- unsigned long verbose;
+ unsigned char probability;
+ unsigned char verbose;
bool task_filter;
unsigned long stacktrace_depth;
unsigned long require_start;
diff --git a/lib/fault-inject.c b/lib/fault-inject.c
index e20151fa5515e..406e27ba8e60f 100644
--- a/lib/fault-inject.c
+++ b/lib/fault-inject.c
@@ -17,13 +17,13 @@
*/
int setup_fault_attr(struct fault_attr *attr, char *str)
{
- unsigned long probability;
+ unsigned char probability;
unsigned long interval;
int times;
int space;
/* "<interval>,<probability>,<space>,<times>" */
- if (sscanf(str, "%lu,%lu,%d,%d",
+ if (sscanf(str, "%lu,%hhu,%d,%d",
&interval, &probability, &space, ×) < 4) {
printk(KERN_WARNING
"FAULT_INJECTION: failed to parse arguments\n");
@@ -43,7 +43,7 @@ static void fail_dump(struct fault_attr *attr)
{
if (attr->verbose > 0 && __ratelimit(&attr->ratelimit_state)) {
printk(KERN_NOTICE "FAULT_INJECTION: forcing a failure.\n"
- "name %pd, interval %lu, probability %lu, "
+ "name %pd, interval %lu, probability %d, "
"space %d, times %d\n", attr->dname,
attr->interval, attr->probability,
atomic_read(&attr->space),
@@ -204,11 +204,11 @@ struct dentry *fault_create_debugfs_attr(const char *name,
if (IS_ERR(dir))
return dir;
- debugfs_create_ul("probability", mode, dir, &attr->probability);
+ debugfs_create_u8("probability", mode, dir, &attr->probability);
debugfs_create_ul("interval", mode, dir, &attr->interval);
debugfs_create_atomic_t("times", mode, dir, &attr->times);
debugfs_create_atomic_t("space", mode, dir, &attr->space);
- debugfs_create_ul("verbose", mode, dir, &attr->verbose);
+ debugfs_create_u8("verbose", mode, dir, &attr->verbose);
debugfs_create_u32("verbose_ratelimit_interval_ms", mode, dir,
&attr->ratelimit_state.interval);
debugfs_create_u32("verbose_ratelimit_burst", mode, dir,
--
2.26.0
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