The patch titled Subject: kexec: drop dependency on ARCH_SUPPORTS_KEXEC from CRASH_DUMP has been added to the -mm mm-hotfixes-unstable branch. Its filename is kexec-drop-dependency-on-arch_supports_kexec-from-crash_dump.patch
This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...
This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------ From: Ignat Korchagin ignat@cloudflare.com Subject: kexec: drop dependency on ARCH_SUPPORTS_KEXEC from CRASH_DUMP Date: Wed, 29 Nov 2023 22:04:09 +0000
In commit f8ff23429c62 ("kernel/Kconfig.kexec: drop select of KEXEC for CRASH_DUMP") we tried to fix a config regression, where CONFIG_CRASH_DUMP required CONFIG_KEXEC.
However, it was not enough at least for arm64 platforms. While further testing the patch with our arm64 config I noticed that CONFIG_CRASH_DUMP is unavailable in menuconfig. This is because CONFIG_CRASH_DUMP still depends on the new CONFIG_ARCH_SUPPORTS_KEXEC introduced in commit 91506f7e5d21 ("arm64/kexec: refactor for kernel/Kconfig.kexec") and on arm64 CONFIG_ARCH_SUPPORTS_KEXEC requires CONFIG_PM_SLEEP_SMP=y, which in turn requires either CONFIG_SUSPEND=y or CONFIG_HIBERNATION=y neither of which are set in our config.
Given that we already established that CONFIG_KEXEC (which is a switch for kexec system call itself) is not required for CONFIG_CRASH_DUMP drop CONFIG_ARCH_SUPPORTS_KEXEC dependency as well. The arm64 kernel builds just fine with CONFIG_CRASH_DUMP=y and with both CONFIG_KEXEC=n and CONFIG_KEXEC_FILE=n after f8ff23429c62 ("kernel/Kconfig.kexec: drop select of KEXEC for CRASH_DUMP") and this patch are applied given that the necessary shared bits are included via CONFIG_KEXEC_CORE dependency.
Link: https://lkml.kernel.org/r/20231129220409.55006-1-ignat@cloudflare.com Fixes: 91506f7e5d21 ("arm64/kexec: refactor for kernel/Kconfig.kexec") Signed-off-by: Ignat Korchagin ignat@cloudflare.com Cc: stable@vger.kernel.org Cc: Alexander Gordeev agordeev@linux.ibm.com Cc: Baoquan He bhe@redhat.com Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
kernel/Kconfig.kexec | 1 - 1 file changed, 1 deletion(-)
--- a/kernel/Kconfig.kexec~kexec-drop-dependency-on-arch_supports_kexec-from-crash_dump +++ a/kernel/Kconfig.kexec @@ -94,7 +94,6 @@ config KEXEC_JUMP config CRASH_DUMP bool "kernel crash dumps" depends on ARCH_SUPPORTS_CRASH_DUMP - depends on ARCH_SUPPORTS_KEXEC select CRASH_CORE select KEXEC_CORE help _
Patches currently in -mm which might be from ignat@cloudflare.com are
kexec-drop-dependency-on-arch_supports_kexec-from-crash_dump.patch