Messages in this thread Patch in this message | | | From | "Hou Wenlong" <> | Subject | [PATCH 2/2] x86/paravirt: Make the struct paravirt_patch_site packed | Date | Fri, 09 Jun 2023 17:45:32 +0800 |
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Similar to struct alt_instr, make the struct paravirt_patch_site packed and get rid of all the .align directives. This could save 2 bytes for one entry on X86_64.
Suggested-by: Nadav Amit <namit@vmware.com> Signed-off-by: Hou Wenlong <houwenlong.hwl@antgroup.com> --- arch/x86/include/asm/paravirt.h | 2 -- arch/x86/include/asm/paravirt_types.h | 4 +--- 2 files changed, 1 insertion(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h index 2350ceb43db0..3e5ccacb3893 100644 --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -747,11 +747,9 @@ extern void default_banner(void); ops; \ 772:; \ .pushsection .parainstructions,"a"; \ - .align 4; \ .long 771b-.; \ .byte ptype; \ .byte 772b-771b; \ - .align 4; \ .popsection diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h index 982a234f5a06..da0547bcd068 100644 --- a/arch/x86/include/asm/paravirt_types.h +++ b/arch/x86/include/asm/paravirt_types.h @@ -8,7 +8,7 @@ struct paravirt_patch_site { s32 instr_offset; /* original instructions */ u8 type; /* type of this instruction */ u8 len; /* length of original instruction */ -}; +} __packed; /* Lazy mode for batching updates / context switch */ enum paravirt_lazy_mode { @@ -270,11 +270,9 @@ extern struct paravirt_patch_template pv_ops; #define _paravirt_alt(insn_string, type) \ "771:\n\t" insn_string "\n" "772:\n" \ ".pushsection .parainstructions,\"a\"\n" \ - " .align 4\n" \ " .long 771b-.\n" \ " .byte " type "\n" \ " .byte 772b-771b\n" \ - " .align 4\n" \ ".popsection\n" /* Generate patchable code, with the default asm parameters. */ -- 2.31.1
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