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arm64/fp: Add comments documenting the usage of state restore functions

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Add comments to help people figure out when fpsimd_bind_state_to_cpu() and
fpsimd_update_current_state() are used.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20211207163250.1373542-1-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown 2021-12-07 16:32:50 +00:00 committed by Catalin Marinas
parent 386a74677b
commit 12b792e5e2
1 changed files with 5 additions and 2 deletions
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7
arch/arm64/kernel/fpsimd.c
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@ -1213,7 +1213,8 @@ void fpsimd_bind_state_to_cpu(struct user_fpsimd_state *st, void *sve_state,
/*
* Load the userland FPSIMD state of 'current' from memory, but only if the
* FPSIMD state already held in the registers is /not/ the most recent FPSIMD
* state of 'current'
* state of 'current'. This is called when we are preparing to return to
* userspace to ensure that userspace sees a good register state.
*/
void fpsimd_restore_current_state(void)
{
@ -1244,7 +1245,9 @@ void fpsimd_restore_current_state(void)
/*
* Load an updated userland FPSIMD state for 'current' from memory and set the
* flag that indicates that the FPSIMD register contents are the most recent
* FPSIMD state of 'current'
* FPSIMD state of 'current'. This is used by the signal code to restore the
* register state when returning from a signal handler in FPSIMD only cases,
* any SVE context will be discarded.
*/
void fpsimd_update_current_state(struct user_fpsimd_state const *state)
{