linux-kernel - Re: [PATCH] riscv: relocate R_RISCV_CALL_PLT in kexec

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Message-ID: <20230723-sprig-audacious-4fff0306735d@spud>
Date:   Sun, 23 Jul 2023 11:27:05 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Conor Dooley <conor.dooley@...rochip.com>
Cc:     Torsten Duwe <duwe@....de>, Palmer Dabbelt <palmer@...belt.com>,
        Li Zhengyu <lizhengyu3@...wei.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Li Huafei <lihuafei1@...wei.com>,
        Liao Chang <liaochang1@...wei.com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        liubao918@...wei.com
Subject: Re: [PATCH] riscv: relocate R_RISCV_CALL_PLT in kexec_file

Hey Torsten,

On Tue, Mar 21, 2023 at 03:35:38PM +0000, Conor Dooley wrote:
> On Tue, Mar 21, 2023 at 04:03:49PM +0100, Torsten Duwe wrote:
> > On Mon, 13 Mar 2023 11:13:17 +0800
> > Li Zhengyu <lizhengyu3@...wei.com> wrote:
> > 
> > > On Fri, 10 Mar 2023 19:27:03 +0100, Torsten Duwe <duwe@....de> wrote:
> > > > Depending on the toolchain (here: gcc-12, binutils-2.40) the
> > > > relocation entries for function calls are no longer R_RISCV_CALL, but
> > > > R_RISCV_CALL_PLT. When trying kexec_load_file on such kernels, it will
> > > > fail with
> > > >
> > > >   kexec_image: Unknown rela relocation: 19
> > > >   kexec_image: Error loading purgatory ret=-8
> > > >
> > > > The binary code at the call site remains the same, so tell
> > > > arch_kexec_apply_relocations_add() to handle _PLT alike.
> > > 
> > > R_RISCV_CALL has already been deprecated, and replaced by R_RISCV_CALL_PLT.
> > > 
> > > See Enum 18-19 in Table 3. Relocation types from 
> > > https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-elf.adoc 
> > > .
> > > 
> > > It was deprecated in ("Deprecated R_RISCV_CALL, prefer 
> > > R_RISCV_CALL_PLT") 
> > > https://github.com/riscv-non-isa/riscv-elf-psabi-doc/commit/a0dced85018d7a0ec17023c9389cbd70b1dbc1b0
> > > 
> > > >
> > > > fixes: 838b3e28488f702 ("Load purgatory in kexec_file")
> > > > Signed-off-by: Torsten Duwe <duwe@...e.de>
> > > > Cc: stable@...r.kernel.org
> > > >
> > > > ---
> > > > --- a/arch/riscv/kernel/elf_kexec.c
> > > > +++ b/arch/riscv/kernel/elf_kexec.c
> > > > @@ -425,6 +425,7 @@ int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
> > > >   		 * sym, instead of searching the whole relsec.
> > > >   		 */
> > > >   		case R_RISCV_PCREL_HI20:
> > > > +		case R_RISCV_CALL_PLT:
> > > >   		case R_RISCV_CALL:
> > > >   			*(u64 *)loc = CLEAN_IMM(UITYPE, *(u64 *)loc) |
> > > >   				 ENCODE_UJTYPE_IMM(val - addr);
> > > >
> > > > .
> > > 
> > > Palmer, please apply these references to the commit message.
> > > 
> > > Reviewed-by: Li Zhengyu <lizhengyu3@...wei.com>
> > > 
> > 
> > Ping?
> 
> It's not been all that longer than a week & you're in patchwork so you
> won't be forgotten,

Turns out it did get forgotten, or more accurately, marked as "Changes
Requested".

> but I noticed a complaint when I went looking on
> patchwork about your fixes tag:
> 
> Commit: f28b81e30b4b ("riscv: relocate R_RISCV_CALL_PLT in kexec_file")
> 	Fixes tag: fixes: 838b3e28488f702 ("Load purgatory in kexec_file")
> 	Has these problem(s):
> 		- Subject does not match target commit subject
> 		  Just use
> 			git log -1 --format='Fixes: %h ("%s")'
> 
> The fixes tag should be:
> Fixes: 838b3e28488f ("RISC-V: Load purgatory in kexec_file")
> 
> Note the capital F & the missed RISC-V: prefix, checkpatch should have
> complained about this.
> Checkpatch also complains that your suse email in the Signoff doesn't
> match the lst.de email that you used to send the patch (IOW you're
> missing a From: header that send-email would add).
> 
> Could you fix those things up please & I suppose you can take the
> opportunity to make the changes that Li Zhengyu suggested to the commit
> message itself at the same time.

Would you mind resending this with the Fixes & Signoff corrections?

Thanks,
Conor.

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