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modpost: Amend ppc64 save/restfpr symnames for -Os build

Building a size optimized ppc64 kernel (-Os), gcc emits more FP
save/restore symbols, that the linker generates on demand into the
.sfpr section. Explicitly allow-list those in scripts/mod/modpost.c,
too. They are needed for the amdgpu in-kernel floating point support.

MODPOST Module.symvers
ERROR: modpost: "_restfpr_20" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_restfpr_26" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_restfpr_22" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_savegpr1_27" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_savegpr1_25" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_restfpr_28" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_savegpr1_29" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_savefpr_20" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_savefpr_22" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_restfpr_15" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
WARNING: modpost: suppressed 56 unresolved symbol warnings because there were too many)

Signed-off-by: René Rebe <rene@exactco.de>
Link: https://patch.msgid.link/20251123.131330.407910684435629198.rene@exactco.de
Signed-off-by: Nathan Chancellor <nathan@kernel.org>

authored by

René Rebe and committed by
Nathan Chancellor 3cd9763c 87abe931

+4
+4
scripts/mod/modpost.c
··· 602 602 /* Special register function linked on all modules during final link of .ko */ 603 603 if (strstarts(symname, "_restgpr0_") || 604 604 strstarts(symname, "_savegpr0_") || 605 + strstarts(symname, "_restgpr1_") || 606 + strstarts(symname, "_savegpr1_") || 607 + strstarts(symname, "_restfpr_") || 608 + strstarts(symname, "_savefpr_") || 605 609 strstarts(symname, "_restvr_") || 606 610 strstarts(symname, "_savevr_") || 607 611 strcmp(symname, ".TOC.") == 0)