random: fix a compilation error on arm64
diff mbox series

Message ID 20200806135836.31736-1-cai@lca.pw
State New
Headers show
Series
  • random: fix a compilation error on arm64
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Commit Message

Qian Cai Aug. 6, 2020, 1:58 p.m. UTC
linux-next failed to compile using this .config,
https://gitlab.com/cailca/linux-mm/-/blob/master/arm64.config

arch/arm64/kernel/kaslr.c: In function 'kaslr_early_init':
arch/arm64/kernel/kaslr.c:128:6: error: implicit declaration of function
'__early_cpu_has_rndr'; did you mean '__early_pfn_to_nid'?
[-Werror=implicit-function-declaration]
  if (__early_cpu_has_rndr()) {
      ^~~~~~~~~~~~~~~~~~~~
      __early_pfn_to_nid
arch/arm64/kernel/kaslr.c:131:7: error: implicit declaration of function
'__arm64_rndr' [-Werror=implicit-function-declaration]
   if (__arm64_rndr(&raw))
       ^~~~~~~~~~~~
cc1: some warnings being treated as errors

Fixes: 585524081ecd ("random: random.h should include archrandom.h, not the other way around")
Signed-off-by: Qian Cai <cai@lca.pw>
---
 include/linux/random.h | 2 ++
 1 file changed, 2 insertions(+)

Comments

kernel test robot Aug. 6, 2020, 10:01 p.m. UTC | #1
Hi Qian,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on linux/master v5.8 next-20200806]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Qian-Cai/random-fix-a-compilation-error-on-arm64/20200807-013039
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 47ec5303d73ea344e84f46660fff693c57641386
config: mips-randconfig-r015-20200805 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 076b120bebfd727b502208601012a44ab2e1028e)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from kernel/fork.c:77:
>> include/linux/random.h:15:10: fatal error: 'asm/archrandom.h' file not found
   #include <asm/archrandom.h>
            ^~~~~~~~~~~~~~~~~~
   1 error generated.

vim +15 include/linux/random.h

    14	
  > 15	#include <asm/archrandom.h>
    16	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
kernel test robot Aug. 6, 2020, 10:25 p.m. UTC | #2
Hi Qian,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on linux/master random/dev tytso-fscrypt/master v5.8 next-20200806]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Qian-Cai/random-fix-a-compilation-error-on-arm64/20200807-013039
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 47ec5303d73ea344e84f46660fff693c57641386
config: m68k-randconfig-r032-20200805 (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from include/linux/net.h:18,
                    from drivers/target/target_core_device.c:14:
>> include/linux/random.h:15:10: fatal error: asm/archrandom.h: No such file or directory
      15 | #include <asm/archrandom.h>
         |          ^~~~~~~~~~~~~~~~~~
   compilation terminated.

vim +15 include/linux/random.h

    14	
  > 15	#include <asm/archrandom.h>
    16	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
Qian Cai Aug. 6, 2020, 10:43 p.m. UTC | #3
On Thu, Aug 06, 2020 at 07:50:23AM -0700, Guenter Roeck wrote:
> On 8/6/20 6:58 AM, Qian Cai wrote:
> > linux-next failed to compile using this .config,
> > https://gitlab.com/cailca/linux-mm/-/blob/master/arm64.config
> > 
> > arch/arm64/kernel/kaslr.c: In function 'kaslr_early_init':
> > arch/arm64/kernel/kaslr.c:128:6: error: implicit declaration of function
> > '__early_cpu_has_rndr'; did you mean '__early_pfn_to_nid'?
> > [-Werror=implicit-function-declaration]
> >   if (__early_cpu_has_rndr()) {
> >       ^~~~~~~~~~~~~~~~~~~~
> >       __early_pfn_to_nid
> > arch/arm64/kernel/kaslr.c:131:7: error: implicit declaration of function
> > '__arm64_rndr' [-Werror=implicit-function-declaration]
> >    if (__arm64_rndr(&raw))
> >        ^~~~~~~~~~~~
> > cc1: some warnings being treated as errors
> > 
> 
> This happens because ARCH_RANDOM is disabled. May be I am wrong, but I
> would argue that __arm64_rndr() should not be called directly in the
> first place. arch_get_random_seed_long_early() should be called instead.

I am not sure about if that would cure possible ARCH_RANDOM=n compiling
failures on all arches. Since my patch would not compile on mips etc, an
alternative is to revert the buggy commit 585524081ecd for now. Any thought?

> 
> Thanks,
> Guenter
> 
> > Fixes: 585524081ecd ("random: random.h should include archrandom.h, not the other way around")
> > Signed-off-by: Qian Cai <cai@lca.pw>
> > ---
> >  include/linux/random.h | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/include/linux/random.h b/include/linux/random.h
> > index f45b8be3e3c4..da782c16c20c 100644
> > --- a/include/linux/random.h
> > +++ b/include/linux/random.h
> > @@ -12,6 +12,8 @@
> >  #include <linux/list.h>
> >  #include <linux/once.h>
> >  
> > +#include <asm/archrandom.h>
> > +
> >  #include <uapi/linux/random.h>
> >  
> >  struct random_ready_callback {
> > 
>
Guenter Roeck Aug. 7, 2020, 12:19 a.m. UTC | #4
On Thu, Aug 06, 2020 at 06:43:14PM -0400, Qian Cai wrote:
> On Thu, Aug 06, 2020 at 07:50:23AM -0700, Guenter Roeck wrote:
> > On 8/6/20 6:58 AM, Qian Cai wrote:
> > > linux-next failed to compile using this .config,
> > > https://gitlab.com/cailca/linux-mm/-/blob/master/arm64.config
> > > 
> > > arch/arm64/kernel/kaslr.c: In function 'kaslr_early_init':
> > > arch/arm64/kernel/kaslr.c:128:6: error: implicit declaration of function
> > > '__early_cpu_has_rndr'; did you mean '__early_pfn_to_nid'?
> > > [-Werror=implicit-function-declaration]
> > >   if (__early_cpu_has_rndr()) {
> > >       ^~~~~~~~~~~~~~~~~~~~
> > >       __early_pfn_to_nid
> > > arch/arm64/kernel/kaslr.c:131:7: error: implicit declaration of function
> > > '__arm64_rndr' [-Werror=implicit-function-declaration]
> > >    if (__arm64_rndr(&raw))
> > >        ^~~~~~~~~~~~
> > > cc1: some warnings being treated as errors
> > > 
> > 
> > This happens because ARCH_RANDOM is disabled. May be I am wrong, but I
> > would argue that __arm64_rndr() should not be called directly in the
> > first place. arch_get_random_seed_long_early() should be called instead.
> 
> I am not sure about if that would cure possible ARCH_RANDOM=n compiling
> failures on all arches. Since my patch would not compile on mips etc, an
> alternative is to revert the buggy commit 585524081ecd for now. Any thought?
> 
It is quite unlikely that any other architecture would attempt to compile
any arm64 code (which is the only code touched by commit 585524081ecd).
Also, commit 585524081ecd fixes a different problem caused by the
recursive inclusion of asm/archrandom.h. On top of that, I think using
arch_get_random_seed_long_early() would be much cleaner than the current
code since it doesn't override/bypass ARCH_RANDOM.

Let's do it this way: I'll submit an alternate patch using
arch_get_random_seed_long_early(). This way Linus can decide how to
proceed, and we don't have to go back and forth.

Thanks,
Guenter

> > 
> > Thanks,
> > Guenter
> > 
> > > Fixes: 585524081ecd ("random: random.h should include archrandom.h, not the other way around")
> > > Signed-off-by: Qian Cai <cai@lca.pw>
> > > ---
> > >  include/linux/random.h | 2 ++
> > >  1 file changed, 2 insertions(+)
> > > 
> > > diff --git a/include/linux/random.h b/include/linux/random.h
> > > index f45b8be3e3c4..da782c16c20c 100644
> > > --- a/include/linux/random.h
> > > +++ b/include/linux/random.h
> > > @@ -12,6 +12,8 @@
> > >  #include <linux/list.h>
> > >  #include <linux/once.h>
> > >  
> > > +#include <asm/archrandom.h>
> > > +
> > >  #include <uapi/linux/random.h>
> > >  
> > >  struct random_ready_callback {
> > > 
> >

Patch
diff mbox series

diff --git a/include/linux/random.h b/include/linux/random.h
index f45b8be3e3c4..da782c16c20c 100644
--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -12,6 +12,8 @@ 
 #include <linux/list.h>
 #include <linux/once.h>
 
+#include <asm/archrandom.h>
+
 #include <uapi/linux/random.h>
 
 struct random_ready_callback {