linux-kernel - Re: [RESEND PATCH] kmemleak-test: Optimize kmemleak

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Date:   Thu, 30 Mar 2023 13:10:13 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Hao Ge <gehao@...inos.cn>
Cc:     alex.williamson@...hat.com, jgg@...pe.ca, akrowiak@...ux.ibm.com,
        arnd@...db.de, mark.rutland@....com, ye.xingchen@....com.cn,
        ojeda@...nel.org, alex.gaynor@...il.com, me@...enk.de,
        gregkh@...uxfoundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, gehao618@....com,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [RESEND PATCH] kmemleak-test: Optimize kmemleak_test.c build
 flow

On Thu, 30 Mar 2023 14:09:04 +0800 Hao Ge <gehao@...inos.cn> wrote:

> Now kmemleak-test.c is moved to samples directory,
> if CONFIG_DEBUG_KMEMLEAK_TEST=m,but CONFIG_SAMPLES
> is not set,it will be meaningless.
> 
> So we will remove CONFIG_DEBUG_KMEMLEAK_TEST and
> add CONFIG_SAMPLE_KMEMLEAK which in samples directory
> to control kmemleak-test.c build or not

Thanks.

I changed the patch title, reworked the changelog and added the Fixes:
information.  Please check all this carefully.



From: Hao Ge <gehao@...inos.cn>
Subject: kmemleak-test: fix kmemleak_test.c build logic
Date: Thu, 30 Mar 2023 14:09:04 +0800

kmemleak-test.c was moved to the samples directory in 1abbef4f51724
("mm,kmemleak-test.c: move kmemleak-test.c to samples dir").

If CONFIG_DEBUG_KMEMLEAK_TEST=m and CONFIG_SAMPLES is unset,
kmemleak-test.c will be unnecessarily compiled.

So move the entry for CONFIG_DEBUG_KMEMLEAK_TEST from mm/Kconfig and add a
new CONFIG_SAMPLE_KMEMLEAK in samples/ to control whether kmemleak-test.c
is built or not.

Link: https://lkml.kernel.org/r/20230330060904.292975-1-gehao@kylinos.cn
Fixes: 1abbef4f51724 ("mm,kmemleak-test.c: move kmemleak-test.c to samples dir")
Signed-off-by: Hao Ge <gehao@...inos.cn>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Alex Gaynor <alex.gaynor@...il.com>
Cc: Alex Williamson <alex.williamson@...hat.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Finn Behrens <me@...enk.dev>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jason Gunthorpe <jgg@...pe.ca>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Miguel Ojeda <ojeda@...nel.org>
Cc: Tony Krowiak <akrowiak@...ux.ibm.com>
Cc: Ye Xingchen <ye.xingchen@....com.cn>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 mm/Kconfig.debug          |    8 --------
 samples/Kconfig           |    7 +++++++
 samples/Makefile          |    2 +-
 samples/kmemleak/Makefile |    2 +-
 4 files changed, 9 insertions(+), 10 deletions(-)

--- a/mm/Kconfig.debug~kmemleak-test-optimize-kmemleak_testc-build-flow
+++ a/mm/Kconfig.debug
@@ -249,14 +249,6 @@ config DEBUG_KMEMLEAK_MEM_POOL_SIZE
 	  fully initialised, this memory pool acts as an emergency one
 	  if slab allocations fail.
 
-config DEBUG_KMEMLEAK_TEST
-	tristate "Simple test for the kernel memory leak detector"
-	depends on DEBUG_KMEMLEAK && m
-	help
-	  This option enables a module that explicitly leaks memory.
-
-	  If unsure, say N.
-
 config DEBUG_KMEMLEAK_DEFAULT_OFF
 	bool "Default kmemleak to off"
 	depends on DEBUG_KMEMLEAK
--- a/samples/Kconfig~kmemleak-test-optimize-kmemleak_testc-build-flow
+++ a/samples/Kconfig
@@ -273,6 +273,13 @@ config SAMPLE_CORESIGHT_SYSCFG
 	  This demonstrates how a user may create their own CoreSight
 	  configurations and easily load them into the system at runtime.
 
+config SAMPLE_KMEMLEAK
+        tristate "Simple test for the kernel memory leak detector"
+        depends on DEBUG_KMEMLEAK && m
+        help
+          Build a sample program which have explicitly leaks memory to test
+          kmemleak
+
 source "samples/rust/Kconfig"
 
 endif # SAMPLES
--- a/samples/kmemleak/Makefile~kmemleak-test-optimize-kmemleak_testc-build-flow
+++ a/samples/kmemleak/Makefile
@@ -1,3 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
-obj-$(CONFIG_DEBUG_KMEMLEAK_TEST) += kmemleak-test.o
+obj-$(CONFIG_SAMPLE_KMEMLEAK) += kmemleak-test.o
--- a/samples/Makefile~kmemleak-test-optimize-kmemleak_testc-build-flow
+++ a/samples/Makefile
@@ -33,7 +33,7 @@ subdir-$(CONFIG_SAMPLE_VFS)		+= vfs
 obj-$(CONFIG_SAMPLE_INTEL_MEI)		+= mei/
 subdir-$(CONFIG_SAMPLE_WATCHDOG)	+= watchdog
 subdir-$(CONFIG_SAMPLE_WATCH_QUEUE)	+= watch_queue
-obj-$(CONFIG_DEBUG_KMEMLEAK_TEST)	+= kmemleak/
+obj-$(CONFIG_SAMPLE_KMEMLEAK)		+= kmemleak/
 obj-$(CONFIG_SAMPLE_CORESIGHT_SYSCFG)	+= coresight/
 obj-$(CONFIG_SAMPLE_FPROBE)		+= fprobe/
 obj-$(CONFIG_SAMPLES_RUST)		+= rust/
_