2.4.0 do_fork() change, all architectures - take 2

From: Keith Owens (kaos@ocs.com.au)
Date: Fri Sep 01 2000 - 22:18:46 EDT

  • Next message: Chip Salzenberg: "Re: Linux 2.2.18pre2"

    DaveM pointed out that my 2.4.0-test8-pre1 do_fork patch would generate
    better sparc assembler if the extra parameter to do_fork was added at
    the end instead of in the middle. So change all do_fork(flags,sp,0,&regs)
    to do_fork(flags,sp,&regs,0);

    I'm not going to mail the complete patch again, you can get it from
    ftp://ftp.ocs.com.au/pub/do_fork-2.4.0-test8-take2.gz. The only
    significant difference is this bit to IA64, untested.

    Index: 0-test8-pre1.1/arch/ia64/kernel/entry.S
    --- 0-test8-pre1.1/arch/ia64/kernel/entry.S Tue, 15 Aug 2000 17:50:48 +1000 kaos (linux-2.4/c/c/16_entry.S 1.3.1.1.1.2 644)
    +++ 0-test8-pre1.2(w)/arch/ia64/kernel/entry.S Sat, 02 Sep 2000 12:49:16 +1100 kaos (linux-2.4/c/c/16_entry.S 1.3.1.1.1.2 644)
    @@ -68,8 +68,8 @@
             mov loc1=r16 // save ar.pfs across do_fork
             UNW(.body)
             mov out1=in1
    - mov out2=in2
    - adds out3=IA64_SWITCH_STACK_SIZE+16,sp // out3 = &regs
    + mov out3=in2
    + adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = &regs
             mov out0=in0 // out0 = clone_flags
             br.call.sptk.few rp=do_fork
     .ret1: UNW(.restore sp)
    @@ -87,8 +87,8 @@
             mov loc1=r16 // save ar.pfs across do_fork
             UNW(.body)
             mov out1=in1
    - mov out2=0
    - adds out3=IA64_SWITCH_STACK_SIZE+16,sp // out3 = &regs
    + mov out3=0
    + adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = &regs
             mov out0=in0 // out0 = clone_flags
             br.call.sptk.few rp=do_fork
     .ret2: UNW(.restore sp)
    Index: 0-test8-pre1.1/arch/ia64/ia32/ia32_entry.S
    --- 0-test8-pre1.1/arch/ia64/ia32/ia32_entry.S Tue, 15 Aug 2000 17:50:48 +1000 kaos (linux-2.4/c/c/25_ia32_entry 1.3.1.1 644)
    +++ 0-test8-pre1.2(w)/arch/ia64/ia32/ia32_entry.S Sat, 02 Sep 2000 12:49:58 +1100 kaos (linux-2.4/c/c/25_ia32_entry 1.3.1.1 644)
    @@ -91,8 +91,8 @@
             UNW(.body)
     
             mov out1=0
    - mov out2=0
    - adds out3=IA64_SWITCH_STACK_SIZE+16,sp
    + mov out3=0
    + adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = &regs
             br.call.sptk.few rp=do_fork
     .ret3: mov ar.pfs=loc1
             UNW(.restore sp)

    -
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