errseq

Name:seq_set - set a errseq_t for later reporting*@eseq: errseq_t field that should be set*@err: error to set (must be between -1 and -MAX_ERRNO)* This function sets the error in @eseq, and increments the sequence counter

Proto:errseq_t errseq_set(errseq_t *eseq, int err)

Type:errseq_t

Parameter:

Type	Parameter	Name
errseq_t *	eseq
int	err

BUILD_BUG_ON_NOT_POWER_OF_2(Kernel pointers have redundant information, so we can use a* scheme where we can return either an error code or a normal* pointer with the same return value.* This should be a per-architecture thing, to allow different* error and pointer decisions. + 1)

old = READ_ONCE( * eseq)

If WARN(Value for the false possibility is greater at compile time(err == 0 || (unsignedint) - err > Kernel pointers have redundant information, so we can use a* scheme where we can return either an error code or a normal* pointer with the same return value.* This should be a per-architecture thing, to allow different* error and pointer decisions.), "err = %d\n", err) Then Return old

cycle

new = old & ~(Kernel pointers have redundant information, so we can use a* scheme where we can return either an error code or a normal* pointer with the same return value.* This should be a per-architecture thing, to allow different* error and pointer decisions. | This bit is used as a flag to indicate whether the value has been seen ) | -err

If old & This bit is used as a flag to indicate whether the value has been seen Then new += The lowest bit of the counter

If new == old Then

cur = new

Break

cur = cmpxchg(eseq, old, new)

100

If Value is more likely to compile time(cur == old || cur == new) Then Break

104

old = cur

106

Return cur

**Caller**
Name	Describe
dio_warn_stale_pagecache	Warn about a page cache invalidation failure during a direct I/O write.

Source code conversion tool public plug-in interface	X
Support c/c++/esqlc/java Oracle/Informix/Mysql Plug-in can realize: logical Report Code generation and batch code conversion

Function report