linux/arch/arm/vfp
Ard Biesheuvel 3cce9d4432 ARM: 9044/1: vfp: use undef hook for VFP support detection
Commit f77ac2e378 ("ARM: 9030/1: entry: omit FP emulation for UND
exceptions taken in kernel mode") failed to take into account that there
is in fact a case where we relied on this code path: during boot, the
VFP detection code issues a read of FPSID, which will trigger an undef
exception on cores that lack VFP support.

So let's reinstate this logic using an undef hook which is registered
only for the duration of the initcall to vpf_init(), and which sets
VFP_arch to a non-zero value - as before - if no VFP support is present.

Fixes: f77ac2e378 ("ARM: 9030/1: entry: omit FP emulation for UND ...")
Reported-by: "kernelci.org bot" <bot@kernelci.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
2020-12-21 11:19:19 +00:00
..
entry.S ARM: 9044/1: vfp: use undef hook for VFP support detection 2020-12-21 11:19:19 +00:00
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: 9030/1: entry: omit FP emulation for UND exceptions taken in kernel mode 2020-12-08 10:15:00 +00:00
vfpinstr.h ARM: 8991/1: use VFP assembler mnemonics if available 2020-07-21 16:33:39 +01:00
vfpmodule.c ARM: 9044/1: vfp: use undef hook for VFP support detection 2020-12-21 11:19:19 +00:00
vfpsingle.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00