Ard Biesheuvel c76c6c4ecb ARM: 9294/2: vfp: Fix broken softirq handling with instrumentation enabled ... Commit 62b95a7b44 ("ARM: 9282/1: vfp: Manipulate task VFP state with softirqs disabled") replaced the en/disable preemption calls inside the VFP state handling code with en/disabling of soft IRQs, which is necessary to allow kernel use of the VFP/SIMD unit when handling a soft IRQ. Unfortunately, when lockdep is enabled (or other instrumentation that enables TRACE_IRQFLAGS), the disable path implemented in asm fails to perform the lockdep and RCU related bookkeeping, resulting in spurious warnings and other badness. Set let's rework the VFP entry code a little bit so we can make the local_bh_disable() call from C, with all the instrumentations that happen to have been configured. Calling local_bh_enable() can be done from asm, as it is a simple wrapper around __local_bh_enable_ip(), which is always a callable function. Link: https://lore.kernel.org/all/ZBBYCSZUJOWBg1s8@localhost.localdomain/ Fixes: 62b95a7b44 ("ARM: 9282/1: vfp: Manipulate task VFP state with softirqs disabled") Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>		2023-04-12 10:04:56 +01:00
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entry.S	ARM: 9294/2: vfp: Fix broken softirq handling with instrumentation enabled	2023-04-12 10:04:56 +01:00
Makefile	ARM: 8989/1: use .fpu assembler directives instead of assembler arguments	2020-07-21 16:33:37 +01:00
vfp.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
vfpdouble.c	ARM: 8026/1: Fix emulation of multiply accumulate instructions	2014-04-14 23:28:24 +01:00
vfphw.S	ARM: 9294/2: vfp: Fix broken softirq handling with instrumentation enabled	2023-04-12 10:04:56 +01:00
vfpinstr.h	ARM: 8991/1: use VFP assembler mnemonics if available	2020-07-21 16:33:39 +01:00
vfpmodule.c	ARM: 9294/2: vfp: Fix broken softirq handling with instrumentation enabled	2023-04-12 10:04:56 +01:00
vfpsingle.c	ARM: convert printk(KERN_* to pr_*	2014-11-21 15:24:50 +00:00