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| author | Heiko Carstens <hca@linux.ibm.com> | 2024-02-03 11:45:17 +0100 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2024-02-16 14:30:16 +0100 |
| commit | 066c40918bb495de8f2e45bd7eec06737a142712 (patch) | |
| tree | 4b510a53f7616d9095336cc60e78fcc54f2275a7 /lib | |
| parent | cad8c3abaac3848f46ba9d1b21f79fab87098da2 (diff) | |
| download | linux-066c40918bb495de8f2e45bd7eec06737a142712.tar.gz | |
s390/fpu: decrease stack usage for some cases
The kernel_fpu structure has a quite large size of 520 bytes. In order to
reduce stack footprint introduce several kernel fpu structures with
different and also smaller sizes. This way every kernel fpu user must use
the correct variant. A compile time check verifies that the correct variant
is used.
There are several users which use only 16 instead of all 32 vector
registers. For those users the new kernel_fpu_16 structure with a size of
only 266 bytes can be used.
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/raid6/s390vx.uc | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/raid6/s390vx.uc b/lib/raid6/s390vx.uc index bc2f4fbe5a8280..92c05b7596bcb4 100644 --- a/lib/raid6/s390vx.uc +++ b/lib/raid6/s390vx.uc @@ -80,7 +80,7 @@ static inline void COPY_VEC(int x, int y) static void raid6_s390vx$#_gen_syndrome(int disks, size_t bytes, void **ptrs) { - DECLARE_KERNEL_FPU_ONSTACK(vxstate); + DECLARE_KERNEL_FPU_ONSTACK32(vxstate); u8 **dptr, *p, *q; int d, z, z0; @@ -113,7 +113,7 @@ static void raid6_s390vx$#_gen_syndrome(int disks, size_t bytes, void **ptrs) static void raid6_s390vx$#_xor_syndrome(int disks, int start, int stop, size_t bytes, void **ptrs) { - DECLARE_KERNEL_FPU_ONSTACK(vxstate); + DECLARE_KERNEL_FPU_ONSTACK32(vxstate); u8 **dptr, *p, *q; int d, z, z0; |