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| author | Ard Biesheuvel <ardb@kernel.org> | 2023-03-20 13:01:16 +0300 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2023-05-17 14:11:38 +0300 |
| commit | 4a0548c6681cd25b8d76e897e01bfb62ce93916d (patch) | |
| tree | 2f824d2b4e734ced07ec2ad24e0debb563d21535 /arch/arm/mm | |
| parent | 8769177658d3559c4323200a719dd456d2f2675a (diff) | |
| download | linux-4a0548c6681cd25b8d76e897e01bfb62ce93916d.tar.xz | |
ARM: vfp: Remove workaround for Feroceon CPUs
Feroceon CPUs have a non-standard implementation of VFP which reports
synchronous VFP exceptions using the async VFP flag. This requires a
workaround which is difficult to reconcile with other implementations,
making it tricky to support both versions in a single image.
Since this is a v5 CPU, it is not supported by armhf and so the
likelihood that anybody is using this with recent distros/kernels and
rely on the VFP at the same time is extremely low. So let's just disable
VFP support on these cores, so we can remove the workaround.
This will help future development to support v5 and v6 CPUs with a
single kernel image.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'arch/arm/mm')
| -rw-r--r-- | arch/arm/mm/proc-feroceon.S | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-feroceon.S b/arch/arm/mm/proc-feroceon.S index 61ce82aca6f0..072ff9b451f8 100644 --- a/arch/arm/mm/proc-feroceon.S +++ b/arch/arm/mm/proc-feroceon.S @@ -56,6 +56,10 @@ ENTRY(cpu_feroceon_proc_init) movne r2, r2, lsr #2 @ turned into # of sets sub r2, r2, #(1 << 5) stmia r1, {r2, r3} +#ifdef CONFIG_VFP + mov r1, #1 @ disable quirky VFP + str_l r1, VFP_arch_feroceon, r2 +#endif ret lr /* |