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.
Thanks,
Guenter
> Fixes: 585524081ecd ("random: random.h should include archrandom.h, not the other way around")
> Signed-off-by: Qian Cai <[email protected]>
> ---
> 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 {
>
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 <[email protected]>
> > ---
> > 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 {
> >
>
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 <[email protected]>
> > > ---
> > > 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 {
> > >
> >