linux-kernel - Re: [GIT PULL] Bitmap patches for v6.0-rc1

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Date:   Sat, 06 Aug 2022 16:11:17 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Yury Norov <yury.norov@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Cc:     Yury Norov <yury.norov@...il.com>
Subject: Re: [GIT PULL] Bitmap patches for v6.0-rc1

Hi Linus,

This pull request has a conflict with the random tree in some powerpc
code.

The random tree removed CONFIG_ARCH_RANDOM and changed the arguments and
names of the arch_get_random_xxx() calls, meanwhile the commit in the
bitmap tree moved our arch_get_random_seed_long() into a C file.

Yury Norov <yury.norov@...il.com> writes:
> The following changes since commit a111daf0c53ae91e71fd2bfe7497862d14132e3e:
>
>   Linux 5.19-rc3 (2022-06-19 15:06:47 -0500)
>
> are available in the Git repository at:
>
>   https://github.com/norov/linux.git/ tags/bitmap-6.0-rc1
>
> for you to fetch changes up to 36d4b36b69590fed99356a4426c940a253a93800:
>
>   lib/nodemask: inline next_node_in() and node_random() (2022-08-01 08:13:21 -0700)
...
>  arch/powerpc/include/asm/archrandom.h              |   9 +-
>  arch/powerpc/kernel/setup-common.c                 |  12 +

There is a textual conflict in archrandom.h. But there's also a fixup
needed in setup-common.c.

Mark spotted it in linux-next but the resolution is not quite right, I
describe the correct result here:

  https://lore.kernel.org/all/87h72q9bgg.fsf@mpe.ellerman.id.au/T/#m068009a89d2412dd4ca14ac598a7d6b8288d4568

Or the end state is attached below.

cheers


==== arch/powerpc/kernel/setup-common.c ====
...

size_t __must_check arch_get_random_seed_longs(unsigned long *v, size_t max_longs)
{
	if (max_longs && ppc_md.get_random_seed && ppc_md.get_random_seed(v))
		return 1;

	return 0;
}
EXPORT_SYMBOL(arch_get_random_seed_longs);

...

==== arch/powerpc/include/asm/archrandom.h ====
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_ARCHRANDOM_H
#define _ASM_POWERPC_ARCHRANDOM_H

static inline size_t __must_check arch_get_random_longs(unsigned long *v, size_t max_longs)
{
	return 0;
}

size_t __must_check arch_get_random_seed_longs(unsigned long *v, size_t max_longs);

#ifdef CONFIG_PPC_POWERNV
int pnv_get_random_long(unsigned long *v);
#endif

#endif /* _ASM_POWERPC_ARCHRANDOM_H */