random: use offstack cpumask when necessary

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[ Upstream commit 5d49f1a5bd ]

The entropy generation function keeps a local cpu mask on the stack,
which can trigger warnings in configurations with a large number of
CPUs:

    drivers/char/random.c:1292:20: error: stack frame size (1288)
    exceeds limit (1280) in 'try_to_generate_entropy' [-Werror,-Wframe-larger-than]

Use the cpumask interface to dynamically allocate it in those
configurations.

Fixes: 1c21fe00ed ("random: spread out jitter callback to different CPUs")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Arnd Bergmann 2025-06-10 11:27:08 +02:00 • committed by Greg Kroah-Hartman

parent 8ddff9989f

commit cbd5021199

1 changed files with 12 additions and 7 deletions

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drivers/char/random.c

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