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Revert "debugfs, coccinelle: check for obsolete DEFINE_SIMPLE_ATTRIBUTE() usage"

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Remove coccinelle's recommendation to use DEFINE_DEBUGFS_ATTRIBUTE()
instead of DEFINE_SIMPLE_ATTRIBUTE().  Regardless of whether or not the
"significant overhead" incurred by debugfs_create_file() is actually
meaningful, warnings from the script have led to a rash of low-quality
patches that have sowed confusion and consumed maintainer time for little
to no benefit.  There have been no less than four attempts to "fix" KVM,
and a quick search on lore shows that KVM is not alone.

This reverts commit 5103068eac.

Link: https://lore.kernel.org/all/87tu2nbnz3.fsf@mpe.ellerman.id.au
Link: https://lore.kernel.org/all/c0b98151-16b6-6d8f-1765-0f7d46682d60@redhat.com
Link: https://lkml.kernel.org/r/20230706072954.4881-1-duminjie%40vivo.com
Link: https://lore.kernel.org/all/Y2FsbufV00jbyF0B@google.com
Link: https://lore.kernel.org/all/Y2ENJJ1YiSg5oHiy@orome
Link: https://lore.kernel.org/all/7560b350e7b23786ce712118a9a504356ff1cca4.camel@kernel.org
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20230726202920.507756-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2023-07-26 13:29:20 -07:00 committed by Paolo Bonzini
parent 211c0189ea
commit 880218361c
1 changed files with 0 additions and 68 deletions
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68
scripts/coccinelle/api/debugfs/debugfs_simple_attr.cocci
View File

@ -1,68 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
/// Use DEFINE_DEBUGFS_ATTRIBUTE rather than DEFINE_SIMPLE_ATTRIBUTE
/// for debugfs files.
///
//# Rationale: DEFINE_SIMPLE_ATTRIBUTE + debugfs_create_file()
//# imposes some significant overhead as compared to
//# DEFINE_DEBUGFS_ATTRIBUTE + debugfs_create_file_unsafe().
//
// Copyright (C): 2016 Nicolai Stange
// Options: --no-includes
//
virtual context
virtual patch
virtual org
virtual report
@dsa@
declarer name DEFINE_SIMPLE_ATTRIBUTE;
identifier dsa_fops;
expression dsa_get, dsa_set, dsa_fmt;
position p;
@@
DEFINE_SIMPLE_ATTRIBUTE@p(dsa_fops, dsa_get, dsa_set, dsa_fmt);
@dcf@
expression name, mode, parent, data;
identifier dsa.dsa_fops;
@@
debugfs_create_file(name, mode, parent, data, &dsa_fops)
@context_dsa depends on context && dcf@
declarer name DEFINE_DEBUGFS_ATTRIBUTE;
identifier dsa.dsa_fops;
expression dsa.dsa_get, dsa.dsa_set, dsa.dsa_fmt;
@@
* DEFINE_SIMPLE_ATTRIBUTE(dsa_fops, dsa_get, dsa_set, dsa_fmt);
@patch_dcf depends on patch expression@
expression name, mode, parent, data;
identifier dsa.dsa_fops;
@@
- debugfs_create_file(name, mode, parent, data, &dsa_fops)
+ debugfs_create_file_unsafe(name, mode, parent, data, &dsa_fops)
@patch_dsa depends on patch_dcf && patch@
identifier dsa.dsa_fops;
expression dsa.dsa_get, dsa.dsa_set, dsa.dsa_fmt;
@@
- DEFINE_SIMPLE_ATTRIBUTE(dsa_fops, dsa_get, dsa_set, dsa_fmt);
+ DEFINE_DEBUGFS_ATTRIBUTE(dsa_fops, dsa_get, dsa_set, dsa_fmt);
@script:python depends on org && dcf@
fops << dsa.dsa_fops;
p << dsa.p;
@@
msg="%s should be defined with DEFINE_DEBUGFS_ATTRIBUTE" % (fops)
coccilib.org.print_todo(p[0], msg)
@script:python depends on report && dcf@
fops << dsa.dsa_fops;
p << dsa.p;
@@
msg="WARNING: %s should be defined with DEFINE_DEBUGFS_ATTRIBUTE" % (fops)
coccilib.report.print_report(p[0], msg)