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Date:   Thu, 10 Jan 2019 15:32:30 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Chandan Rajendra <chandan@...ux.vnet.ibm.com>
Cc:     Eric Biggers <ebiggers@...gle.com>,
        linux-f2fs-devel@...ts.sourceforge.net, linux-ext4@...r.kernel.org,
        Theodore Ts'o <tytso@....edu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fscrypt: remove filesystem specific build config option

On Sat, Dec 08, 2018 at 12:21:38PM +0530, Chandan Rajendra wrote:
> In order to have a common code base for fscrypt "post read" processing
> for all filesystems which support encryption, this commit removes
> filesystem specific build config option (e.g. CONFIG_EXT4_FS_ENCRYPTION)
> and replaces it with a build option (i.e. CONFIG_FS_ENCRYPTION) whose
> value affects all the filesystems making use of fscrypt.
> 
> Signed-off-by: Chandan Rajendra <chandan@...ux.vnet.ibm.com>
> Signed-off-by: Theodore Ts'o <tytso@....edu>

This results in:

Building ia64:allnoconfig ... failed
--------------
Error log:
make[1]: Entering directory '/tmp/buildbot-builddir.7Wft3'
  GEN     Makefile
scripts/kconfig/conf  --allnoconfig Kconfig
arch/ia64/Kconfig:128:error: recursive dependency detected!
arch/ia64/Kconfig:128:	choice <choice> contains symbol IA64_HP_SIM
arch/ia64/Kconfig:202:	symbol IA64_HP_SIM is part of choice PM
kernel/power/Kconfig:144:	symbol PM is selected by PM_SLEEP
kernel/power/Kconfig:104:	symbol PM_SLEEP depends on HIBERNATE_CALLBACKS
kernel/power/Kconfig:31:	symbol HIBERNATE_CALLBACKS is selected by HIBERNATION
kernel/power/Kconfig:34:	symbol HIBERNATION depends on SWAP
init/Kconfig:250:	symbol SWAP depends on BLOCK
block/Kconfig:5:	symbol BLOCK is selected by UBIFS_FS
fs/ubifs/Kconfig:1:	symbol UBIFS_FS depends on MISC_FILESYSTEMS
fs/Kconfig:227:	symbol MISC_FILESYSTEMS is selected by ACPI_APEI
drivers/acpi/apei/Kconfig:8:	symbol ACPI_APEI depends on ACPI
drivers/acpi/Kconfig:9:	symbol ACPI depends on ARCH_SUPPORTS_ACPI
drivers/acpi/Kconfig:6:	symbol ARCH_SUPPORTS_ACPI is selected by IA64_HP_SIM
arch/ia64/Kconfig:202:	symbol IA64_HP_SIM is part of choice <choice>
For a resolution refer to Documentation/kbuild/kconfig-language.txt
subsection "Kconfig recursive dependency limitations"

Didn't we have exactly the same problem before ?

Guenter

---
# bad: [6cab33afc3dd17bd9922c99a828f5680b4667cd9] Add linux-next specific files for 20190110
# good: [bfeffd155283772bbe78c6a05dec7c0128ee500c] Linux 5.0-rc1
git bisect start 'HEAD' 'v5.0-rc1'
# bad: [45daa05b201d684d42a186970731a9e39f75beb7] Merge remote-tracking branch 'mtd/mtd/next'
git bisect bad 45daa05b201d684d42a186970731a9e39f75beb7
# good: [f570411d3495dc4acf76cffa3a4c3cca6ae693fb] Merge remote-tracking branch 'renesas/next'
git bisect good f570411d3495dc4acf76cffa3a4c3cca6ae693fb
# bad: [849603c11808c63603b5ed4469e10e0760bc3d54] Merge remote-tracking branch 'ext3/for_next'
git bisect bad 849603c11808c63603b5ed4469e10e0760bc3d54
# good: [2a6bce75e611c112d3971a4b9dcff8028d8b1f2d] Merge remote-tracking branch 'parisc-hd/for-next'
git bisect good 2a6bce75e611c112d3971a4b9dcff8028d8b1f2d
# good: [41602048a8a5b2003f8341d07ae9f0071276653d] Merge remote-tracking branch 'xtensa/xtensa-for-next'
git bisect good 41602048a8a5b2003f8341d07ae9f0071276653d
# bad: [a9e5d743c35d47c459d5ee80454fe23391a8d654] Merge remote-tracking branch 'btrfs-kdave/for-next'
git bisect bad a9e5d743c35d47c459d5ee80454fe23391a8d654
# good: [dc82005ead5de0e5bb764c0c1c50a19891b6de15] ext4: use IS_ENCRYPTED() to check encryption status
git bisect good dc82005ead5de0e5bb764c0c1c50a19891b6de15
# bad: [7138851022cbedd6ae6303168c2195c714ed3548] fsverity: Move verity status check to fsverity_file_open
git bisect bad 7138851022cbedd6ae6303168c2195c714ed3548
# bad: [4dedd7844d2241d358c121d06109dfda2e46843f] Add S_VERITY and IS_VERITY()
git bisect bad 4dedd7844d2241d358c121d06109dfda2e46843f
# bad: [f3fd6cd74fedf99b6060f75df00943fda13b65f2] fscrypt: remove filesystem specific build config option
git bisect bad f3fd6cd74fedf99b6060f75df00943fda13b65f2
# good: [1dcfeb539c09237c98b99685fb9cd156241db13f] f2fs: use IS_ENCRYPTED() to check encryption status
git bisect good 1dcfeb539c09237c98b99685fb9cd156241db13f
# first bad commit: [f3fd6cd74fedf99b6060f75df00943fda13b65f2] fscrypt: remove filesystem specific build config option

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