Valentin Schneider 7bb5da0d49 kexec: turn all kexec_mutex acquisitions into trylocks ... Patch series "kexec, panic: Making crash_kexec() NMI safe", v4. This patch (of 2): Most acquistions of kexec_mutex are done via mutex_trylock() - those were a direct "translation" from: 8c5a1cf0ad ("kexec: use a mutex for locking rather than xchg()") there have however been two additions since then that use mutex_lock(): crash_get_memory_size() and crash_shrink_memory(). A later commit will replace said mutex with an atomic variable, and locking operations will become atomic_cmpxchg(). Rather than having those mutex_lock() become while (atomic_cmpxchg(&lock, 0, 1)), turn them into trylocks that can return -EBUSY on acquisition failure. This does halve the printable size of the crash kernel, but that's still neighbouring 2G for 32bit kernels which should be ample enough. Link: https://lkml.kernel.org/r/20220630223258.4144112-1-vschneid@redhat.com Link: https://lkml.kernel.org/r/20220630223258.4144112-2-vschneid@redhat.com Signed-off-by: Valentin Schneider <vschneid@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Eric W . Biederman" <ebiederm@xmission.com> Cc: Juri Lelli <jlelli@redhat.com> Cc: Luis Claudio R. Goncalves <lgoncalv@redhat.com> Cc: Miaohe Lin <linmiaohe@huawei.com> Cc: Petr Mladek <pmladek@suse.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Baoquan He <bhe@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2022-09-11 21:55:06 -07:00
..
acpi	Merge branch 'acpi-properties'	2022-08-11 19:21:03 +02:00
asm-generic	Seventeen hotfixes. Mostly memory management things. Ten patches are	2022-08-28 14:49:59 -07:00
clocksource
crypto	for-5.20/block-2022-08-04	2022-08-04 20:00:14 -07:00
drm
dt-bindings	power supply and reset changes for the v6.0 series	2022-08-12 09:37:33 -07:00
keys
kunit
kvm
linux	kexec: turn all kexec_mutex acquisitions into trylocks	2022-09-11 21:55:06 -07:00
math-emu
media	SPDX changes for 6.0-rc1	2022-08-04 12:12:54 -07:00
memory
misc
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf	2022-08-24 19:18:10 -07:00
pcmcia
ras	mm, hwpoison: enable memory error handling on 1GB hugepage	2022-08-08 18:06:44 -07:00
rdma	dma-mapping updates	2022-08-06 10:56:45 -07:00
rv
scsi	SCSI misc on 20220813	2022-08-13 13:41:48 -07:00
soc	net: mscc: ocelot: keep ocelot_stat_layout by reg address, not offset	2022-08-17 21:58:32 -07:00
sound
target
trace	* Xen timer fixes	2022-08-11 12:10:08 -07:00
uapi	io_uring-6.0-2022-08-26	2022-08-26 11:01:52 -07:00
ufs	scsi: ufs: core: Enable link lost interrupt	2022-08-11 22:04:32 -04:00
vdso
video
xen	x86/xen: Add support for HVMOP_set_evtchn_upcall_vector	2022-08-12 11:28:21 +02:00