linux-kernel - Re: [PATCH] parisc: Switch to generic COMPAT_BINFMT

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Date:   Fri, 13 Apr 2018 21:54:37 +0200
From:   Helge Deller <deller@....de>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-kernel@...r.kernel.org, linux-parisc@...r.kernel.org
Subject: Re: [PATCH] parisc: Switch to generic COMPAT_BINFMT_ELF

* Guenter Roeck <linux@...ck-us.net>:
> On Wed, Apr 11, 2018 at 09:09:53AM +0200, Helge Deller wrote:
> > Drop our own compat binfmt implementation in
> > arch/parisc/kernel/binfmt_elf32.c in favour of the generic
> > implementation with CONFIG_COMPAT_BINFMT_ELF.
> > 
> > While cleaning up the dependencies, I noticed that ELF_PLATFORM was strangely
> > defined: On a 32-bit kernel, it was defined to "PARISC", while when running in
> > compat mode on a 64-bit kernel it was defined to "PARISC32". Since it doesn't
> > seem to be used in glibc yet, it's now defined in both cases to "PARISC". In
> > any case, it can be distinguished because it's either a 32-bit or a 64-bit ELF
> > file.
> > 
> > Signed-off-by: Helge Deller <deller@....de>
> 
> This patch results in:
> 
> Building parisc:a500_defconfig ... failed
> --------------
> Error log:
> make[2]: *** No rule to make target 'arch/parisc/kernel/binfmt_elf32.o', needed
> by 'arch/parisc/kernel/built-in.a'.  Stop.
> make[2]: *** Waiting for unfinished jobs....
> make[1]: *** [arch/parisc/kernel] Error 2
> make[1]: *** Waiting for unfinished jobs....
> make: *** [sub-make] Error 2
> --------------
> Building parisc:generic-64bit_defconfig ... failed
> --------------
> Error log:
> make[2]: *** No rule to make target 'arch/parisc/kernel/binfmt_elf32.o', needed
> by 'arch/parisc/kernel/built-in.a'.  Stop.
> 
> Indeed, arch/parisc/kernel/binfmt_elf32.o is still listed in Makefile
> for 64-bit builds.
> 
> $ git grep binfmt_elf32.o arch/parisc/
> arch/parisc/kernel/Makefile:obj-$(CONFIG_64BIT) += binfmt_elf32.o sys_parisc32.o signal32.o

You are right.
I got fooled because I still had the binfmt_elf32.o object in my build
directory and so I didn't faced this build error. And even 0-day builds
didn't complained...  

Thanks for testing!

Patch below fixes it.

Helge
---

[PATCH] parisc: Fix missing binfmt_elf32.o build error

Commit 71d577db01a5 ("parisc: Switch to generic COMPAT_BINFMT_ELF")
removed the binfmt_elf32.c source file, but missed to drop the object
file from list of object files the Makefile too, which then results in a
build error.

Fixes: 71d577db01a5 ("parisc: Switch to generic COMPAT_BINFMT_ELF")
Reported-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Helge Deller <deller@....de>


diff --git a/arch/parisc/kernel/Makefile b/arch/parisc/kernel/Makefile
index eafd06a..e5de34d 100644
--- a/arch/parisc/kernel/Makefile
+++ b/arch/parisc/kernel/Makefile
@@ -23,7 +23,7 @@ obj-$(CONFIG_SMP)	+= smp.o
 obj-$(CONFIG_PA11)	+= pci-dma.o
 obj-$(CONFIG_PCI)	+= pci.o
 obj-$(CONFIG_MODULES)	+= module.o
-obj-$(CONFIG_64BIT)	+= binfmt_elf32.o sys_parisc32.o signal32.o
+obj-$(CONFIG_64BIT)	+= sys_parisc32.o signal32.o
 obj-$(CONFIG_STACKTRACE)+= stacktrace.o
 obj-$(CONFIG_AUDIT)	+= audit.o
 obj64-$(CONFIG_AUDIT)	+= compat_audit.o