[PATCH] Make is_signed_type() simpler

Alexey Dobriyan
2019-09-29T20:06:27Z

* Simply compare -1 with 0,
* Drop unnecessary parenthesis sets

New macro leaves pointer as "unsigned type" but gives a warning,
which should be fine because asking whether a pointer is signed is
strange question.

I'm not sure what's going on in the i915 driver, it is shipping kernel
pointers to userspace.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

drivers/gpu/drm/i915/i915_trace.h | 86 +++++++++++++++++++-------------------
include/linux/overflow.h | 2
include/linux/trace_events.h | 2
tools/include/linux/overflow.h | 2
4 files changed, 46 insertions(+), 46 deletions(-)

--- a/drivers/gpu/drm/i915/i915_trace.h
+++ b/drivers/gpu/drm/i915/i915_trace.h
@@ -419,16 +419,16 @@ TRACE_EVENT(i915_gem_object_create,
TP_ARGS(obj),

TP_STRUCT__entry(
- __field(struct drm_i915_gem_object *, obj)
+ __field(unsigned long, obj)
__field(u64, size)
),

TP_fast_assign(
- __entry->obj = obj;
+ __entry->obj = (unsigned long)obj;
__entry->size = obj->base.size;
),

- TP_printk("obj=%p, size=0x%llx", __entry->obj, __entry->size)
+ TP_printk("obj=%p, size=0x%llx", (void *)__entry->obj, __entry->size)
);

TRACE_EVENT(i915_gem_shrink,
@@ -456,25 +456,25 @@ TRACE_EVENT(i915_vma_bind,
TP_ARGS(vma, flags),

TP_STRUCT__entry(
- __field(struct drm_i915_gem_object *, obj)
- __field(struct i915_address_space *, vm)
+ __field(unsigned long, obj)
+ __field(unsigned long, vm)
__field(u64, offset)
__field(u64, size)
__field(unsigned, flags)
),

TP_fast_assign(
- __entry->obj = vma->obj;
- __entry->vm = vma->vm;
+ __entry->obj = (unsigned long)vma->obj;
+ __entry->vm = (unsigned long)vma->vm;
__entry->offset = vma->node.start;
__entry->size = vma->node.size;
__entry->flags = flags;
),

TP_printk("obj=%p, offset=0x%016llx size=0x%llx%s vm=%p",
- __entry->obj, __entry->offset, __entry->size,
+ (void *)__entry->obj, __entry->offset, __entry->size,
__entry->flags & PIN_MAPPABLE ? ", mappable" : "",
- __entry->vm)
+ (void *)__entry->vm)
);

TRACE_EVENT(i915_vma_unbind,
@@ -482,21 +482,21 @@ TRACE_EVENT(i915_vma_unbind,
TP_ARGS(vma),

TP_STRUCT__entry(
- __field(struct drm_i915_gem_object *, obj)
- __field(struct i915_address_space *, vm)
+ __field(unsigned long, obj)
+ __field(unsigned long, vm)
__field(u64, offset)
__field(u64, size)
),

TP_fast_assign(
- __entry->obj = vma->obj;
- __entry->vm = vma->vm;
+ __entry->obj = (unsigned long)vma->obj;
+ __entry->vm = (unsigned long)vma->vm;
__entry->offset = vma->node.start;
__entry->size = vma->node.size;
),

TP_printk("obj=%p, offset=0x%016llx size=0x%llx vm=%p",
- __entry->obj, __entry->offset, __entry->size, __entry->vm)
+ (void *)__entry->obj, __entry->offset, __entry->size, (void *)__entry->vm)
);

TRACE_EVENT(i915_gem_object_pwrite,
@@ -504,19 +504,19 @@ TRACE_EVENT(i915_gem_object_pwrite,
TP_ARGS(obj, offset, len),

TP_STRUCT__entry(
- __field(struct drm_i915_gem_object *, obj)
+ __field(unsigned long, obj)
__field(u64, offset)
__field(u64, len)
),

TP_fast_assign(
- __entry->obj = obj;
+ __entry->obj = (unsigned long)obj;
__entry->offset = offset;
__entry->len = len;
),

TP_printk("obj=%p, offset=0x%llx, len=0x%llx",
- __entry->obj, __entry->offset, __entry->len)
+ (void *)__entry->obj, __entry->offset, __entry->len)
);

TRACE_EVENT(i915_gem_object_pread,
@@ -524,19 +524,19 @@ TRACE_EVENT(i915_gem_object_pread,
TP_ARGS(obj, offset, len),

TP_STRUCT__entry(
- __field(struct drm_i915_gem_object *, obj)
+ __field(unsigned long, obj)
__field(u64, offset)
__field(u64, len)
),

TP_fast_assign(
- __entry->obj = obj;
+ __entry->obj = (unsigned long)obj;
__entry->offset = offset;
__entry->len = len;
),

TP_printk("obj=%p, offset=0x%llx, len=0x%llx",
- __entry->obj, __entry->offset, __entry->len)
+ (void *)__entry->obj, __entry->offset, __entry->len)
);

TRACE_EVENT(i915_gem_object_fault,
@@ -544,21 +544,21 @@ TRACE_EVENT(i915_gem_object_fault,
TP_ARGS(obj, index, gtt, write),

TP_STRUCT__entry(
- __field(struct drm_i915_gem_object *, obj)
+ __field(unsigned long, obj)
__field(u64, index)
__field(bool, gtt)
__field(bool, write)
),

TP_fast_assign(
- __entry->obj = obj;
+ __entry->obj = (unsigned long)obj;
__entry->index = index;
__entry->gtt = gtt;
__entry->write = write;
),

TP_printk("obj=%p, %s index=%llu %s",
- __entry->obj,
+ (void *)__entry->obj,
__entry->gtt ? "GTT" : "CPU",
__entry->index,
__entry->write ? ", writable" : "")
@@ -569,14 +569,14 @@ DECLARE_EVENT_CLASS(i915_gem_object,
TP_ARGS(obj),

TP_STRUCT__entry(
- __field(struct drm_i915_gem_object *, obj)
+ __field(unsigned long, obj)
),

TP_fast_assign(
- __entry->obj = obj;
+ __entry->obj = (unsigned long)obj;
),

- TP_printk("obj=%p", __entry->obj)
+ TP_printk("obj=%p", (void *)__entry->obj)
);

DEFINE_EVENT(i915_gem_object, i915_gem_object_clflush,
@@ -595,7 +595,7 @@ TRACE_EVENT(i915_gem_evict,

TP_STRUCT__entry(
__field(u32, dev)
- __field(struct i915_address_space *, vm)
+ __field(unsigned long, vm)
__field(u64, size)
__field(u64, align)
__field(unsigned int, flags)
@@ -603,14 +603,14 @@ TRACE_EVENT(i915_gem_evict,

TP_fast_assign(
__entry->dev = vm->i915->drm.primary->index;
- __entry->vm = vm;
+ __entry->vm = (unsigned long)vm;
__entry->size = size;
__entry->align = align;
__entry->flags = flags;
),

TP_printk("dev=%d, vm=%p, size=0x%llx, align=0x%llx %s",
- __entry->dev, __entry->vm, __entry->size, __entry->align,
+ __entry->dev, (void *)__entry->vm, __entry->size, __entry->align,
__entry->flags & PIN_MAPPABLE ? ", mappable" : "")
);

@@ -620,7 +620,7 @@ TRACE_EVENT(i915_gem_evict_node,

TP_STRUCT__entry(
__field(u32, dev)
- __field(struct i915_address_space *, vm)
+ __field(unsigned long, vm)
__field(u64, start)
__field(u64, size)
__field(unsigned long, color)
@@ -629,7 +629,7 @@ TRACE_EVENT(i915_gem_evict_node,

TP_fast_assign(
__entry->dev = vm->i915->drm.primary->index;
- __entry->vm = vm;
+ __entry->vm = (unsigned long)vm;
__entry->start = node->start;
__entry->size = node->size;
__entry->color = node->color;
@@ -637,7 +637,7 @@ TRACE_EVENT(i915_gem_evict_node,
),

TP_printk("dev=%d, vm=%p, start=0x%llx size=0x%llx, color=0x%lx, flags=%x",
- __entry->dev, __entry->vm,
+ __entry->dev, (void *)__entry->vm,
__entry->start, __entry->size,
__entry->color, __entry->flags)
);
@@ -648,15 +648,15 @@ TRACE_EVENT(i915_gem_evict_vm,

TP_STRUCT__entry(
__field(u32, dev)
- __field(struct i915_address_space *, vm)
+ __field(unsigned long, vm)
),

TP_fast_assign(
__entry->dev = vm->i915->drm.primary->index;
- __entry->vm = vm;
+ __entry->vm = (unsigned long)vm;
),

- TP_printk("dev=%d, vm=%p", __entry->dev, __entry->vm)
+ TP_printk("dev=%d, vm=%p", __entry->dev, (void *)__entry->vm)
);

TRACE_EVENT(i915_request_queue,
@@ -922,16 +922,16 @@ DECLARE_EVENT_CLASS(i915_ppgtt,
TP_ARGS(vm),

TP_STRUCT__entry(
- __field(struct i915_address_space *, vm)
+ __field(unsigned long, vm)
__field(u32, dev)
),

TP_fast_assign(
- __entry->vm = vm;
+ __entry->vm = (unsigned long)vm;
__entry->dev = vm->i915->drm.primary->index;
),

- TP_printk("dev=%u, vm=%p", __entry->dev, __entry->vm)
+ TP_printk("dev=%u, vm=%p", __entry->dev, (void *)__entry->vm)
)

DEFINE_EVENT(i915_ppgtt, i915_ppgtt_create,
@@ -957,20 +957,20 @@ DECLARE_EVENT_CLASS(i915_context,

TP_STRUCT__entry(
__field(u32, dev)
- __field(struct i915_gem_context *, ctx)
+ __field(unsigned long, ctx)
__field(u32, hw_id)
- __field(struct i915_address_space *, vm)
+ __field(unsigned long, vm)
),

TP_fast_assign(
__entry->dev = ctx->i915->drm.primary->index;
- __entry->ctx = ctx;
+ __entry->ctx = (unsigned long)ctx;
__entry->hw_id = ctx->hw_id;
- __entry->vm = ctx->vm;
+ __entry->vm = (unsigned long)ctx->vm;
),

TP_printk("dev=%u, ctx=%p, ctx_vm=%p, hw_id=%u",
- __entry->dev, __entry->ctx, __entry->vm, __entry->hw_id)
+ __entry->dev, (void *)__entry->ctx, (void *)__entry->vm, __entry->hw_id)
)

DEFINE_EVENT(i915_context, i915_context_create,
--- a/include/linux/overflow.h
+++ b/include/linux/overflow.h
@@ -31,7 +31,7 @@
* https://mail-index.netbsd.org/tech-misc/2007/02/05/0000.html -
* credit to Christian Biere.
*/
-#define is_signed_type(type) (((type)(-1)) < (type)1)
+#define is_signed_type(type) ((type)-1 < 0)
#define __type_half_max(type) ((type)1 << (8*sizeof(type) - 1 - is_signed_type(type)))
#define type_max(T) ((T)((__type_half_max(T) - 1) + __type_half_max(T)))
#define type_min(T) ((T)((T)-type_max(T)-(T)1))
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -546,7 +546,7 @@ extern int trace_add_event_call(struct trace_event_call *call);
extern int trace_remove_event_call(struct trace_event_call *call);
extern int trace_event_get_offsets(struct trace_event_call *call);

-#define is_signed_type(type) (((type)(-1)) < (type)1)
+#define is_signed_type(type) ((type)-1 < 0)

int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
int trace_set_clr_event(const char *system, const char *event, int set);
--- a/tools/include/linux/overflow.h
+++ b/tools/include/linux/overflow.h
@@ -31,7 +31,7 @@
* https://mail-index.netbsd.org/tech-misc/2007/02/05/0000.html -
* credit to Christian Biere.
*/
-#define is_signed_type(type) (((type)(-1)) < (type)1)
+#define is_signed_type(type) ((type)-1 < 0)
#define __type_half_max(type) ((type)1 << (8*sizeof(type) - 1 - is_signed_type(type)))
#define type_max(T) ((T)((__type_half_max(T) - 1) + __type_half_max(T)))
#define type_min(T) ((T)((T)-type_max(T)-(T)1))