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authorDave Martin <Dave.Martin@arm.com>2018-03-28 12:50:48 +0300
committerWill Deacon <will.deacon@arm.com>2018-03-28 17:20:17 +0300
commit20b8547277a6e8ee1d928792c1b2782c9a2a6cf5 (patch)
treeb7a84cdb011209b33c8f8df19f6dfadadc429433 /arch/arm64/kernel/signal32.c
parent7f170499f734c417290518aa50cac11953bf8161 (diff)
downloadlinux-20b8547277a6e8ee1d928792c1b2782c9a2a6cf5.tar.xz
arm64: fpsimd: Split cpu field out from struct fpsimd_state
In preparation for using a common representation of the FPSIMD state for tasks and KVM vcpus, this patch separates out the "cpu" field that is used to track the cpu on which the state was most recently loaded. This will allow common code to operate on task and vcpu contexts without requiring the cpu field to be stored at the same offset from the FPSIMD register data in both cases. This should avoid the need for messing with the definition of those parts of struct vcpu_arch that are exposed in the KVM user ABI. The resulting change is also convenient for grouping and defining the set of thread_struct fields that are supposed to be accessible to copy_{to,from}_user(), which includes user_fpsimd_state but should exclude the cpu field. This patch does not amend the usercopy whitelist to match: that will be addressed in a subsequent patch. Signed-off-by: Dave Martin <Dave.Martin@arm.com> [will: inline fpsimd_flush_state for now] Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel/signal32.c')
-rw-r--r--arch/arm64/kernel/signal32.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/arm64/kernel/signal32.c b/arch/arm64/kernel/signal32.c
index 68f5e07b592b..374333703cbd 100644
--- a/arch/arm64/kernel/signal32.c
+++ b/arch/arm64/kernel/signal32.c
@@ -149,8 +149,7 @@ union __fpsimd_vreg {
static int compat_preserve_vfp_context(struct compat_vfp_sigframe __user *frame)
{
- struct user_fpsimd_state const *fpsimd =
- &current->thread.fpsimd_state.user_fpsimd;
+ struct user_fpsimd_state const *fpsimd = &current->thread.fpsimd_state;
compat_ulong_t magic = VFP_MAGIC;
compat_ulong_t size = VFP_STORAGE_SIZE;
compat_ulong_t fpscr, fpexc;