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s390/fpu: decrease stack usage for some cases

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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>
This commit is contained in:
Heiko Carstens
2024-02-03 11:45:17 +01:00
parent cad8c3abaa
commit 066c40918b
8 changed files with 97 additions and 43 deletions
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lib/raid6/s390vx.uc
+2 -2
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@@ -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;