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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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40bdac7dbc
This is an implementation of a suggestion made by Chris Torek:
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Something else I noticed in passing: the EX and EX_LD/EX_ST macros
scattered throughout the various .S files make a fair bit of .fixup
code, all of which does the same thing. At the cost of one symbol
in copy_in_user.S, you could just have one common two-instruction
retl-and-mov-1 fixup that they all share.
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The following is with a defconfig build:
text data bss dec hex filename
3972767 344024 584449 4901240 4ac978 vmlinux.orig
3968887 344024 584449 4897360 4aba50 vmlinux
Signed-off-by: David S. Miller <davem@davemloft.net>
35 lines
698 B
ArmAsm
35 lines
698 B
ArmAsm
/* GENcopy_to_user.S: Generic sparc64 copy to userspace.
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*
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* Copyright (C) 2007 David S. Miller (davem@davemloft.net)
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*/
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#define EX_ST(x) \
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98: x; \
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.section __ex_table,"a";\
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.align 4; \
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.word 98b, __retl_one; \
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.text; \
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.align 4;
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#ifndef ASI_AIUS
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#define ASI_AIUS 0x11
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#endif
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#define FUNC_NAME GENcopy_to_user
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#define STORE(type,src,addr) type##a src, [addr] ASI_AIUS
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#define EX_RETVAL(x) 0
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#ifdef __KERNEL__
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/* Writing to %asi is _expensive_ so we hardcode it.
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* Reading %asi to check for KERNEL_DS is comparatively
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* cheap.
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*/
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#define PREAMBLE \
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rd %asi, %g1; \
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cmp %g1, ASI_AIUS; \
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bne,pn %icc, memcpy_user_stub; \
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nop
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#endif
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#include "GENmemcpy.S"
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