函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\trace\trace_events_hist.c Create Date:2022-07-27 13:36:34
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：hist_field_log2

函数原型：static u64 hist_field_log2(struct hist_field *hist_field, struct tracing_map_elt *elt, struct ring_buffer_event *rbe, void *event)

返回类型：u64

参数：

类型参数名称
struct hist_field *hist_field
struct tracing_map_elt *elt
struct ring_buffer_event *rbe
void *event
206  operand等于operands[0]
208  val等于fn(operand, elt, rbe, event)
210  返回:log2 - log base 2 of 32-bit or a 64-bit unsigned value*@n: parameter* constant-capable log of base 2 calculation* - this can be used to initialise global variables from constant data, hence* the massive ternary operator construction* selects the (undup_pow_of_two - round the given value up to nearest power of two*@n: parameter* round the given value up to the nearest power of two* - the result is undefined when n == 0* - this can be used to initialise global variables from constant data(val))