diff options
| author | Dave Martin <Dave.Martin@arm.com> | 2018-06-01 13:10:13 +0300 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2018-06-01 17:53:07 +0300 |
| commit | 87c021a8143b6133e0085a8162f2a127462b54a3 (patch) | |
| tree | 63cf1f0255bc65b88b28614be8465c81e6598090 /arch/arm64/kernel/ptrace.c | |
| parent | cb877710e58f7266215fbf2d51516c9fc6993019 (diff) | |
| download | linux-87c021a8143b6133e0085a8162f2a127462b54a3.tar.xz | |
arm64/sve: Thin out initialisation sanity-checks for sve_max_vl
Now that the kernel SVE support is reasonably mature, it is
excessive to default sve_max_vl to the invalid value -1 and then
sprinkle WARN_ON()s around the place to make sure it has been
initialised before use. The cpufeatures code already runs pretty
early, and will ensure sve_max_vl gets initialised.
This patch initialises sve_max_vl to something sane that will be
supported by every SVE implementation, and removes most of the
sanity checks.
The checks in find_supported_vector_length() are retained for now.
If anything goes horribly wrong, we are likely to trip a check here
sooner or later.
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel/ptrace.c')
| -rw-r--r-- | arch/arm64/kernel/ptrace.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index f847285d96f3..bd732644c2f6 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -766,9 +766,6 @@ static void sve_init_header_from_task(struct user_sve_header *header, vq = sve_vq_from_vl(header->vl); header->max_vl = sve_max_vl; - if (WARN_ON(!sve_vl_valid(sve_max_vl))) - header->max_vl = header->vl; - header->size = SVE_PT_SIZE(vq, header->flags); header->max_size = SVE_PT_SIZE(sve_vq_from_vl(header->max_vl), SVE_PT_REGS_SVE); |